SEC Info℠  
    Home      Search      My Interests      Help      Sign In      Please Sign In

Hill International, Inc. – ‘10-K’ for 12/31/19 – ‘JSON’

On:  Wednesday, 3/25/20, at 8:26pm ET   ·   As of:  3/26/20   ·   For:  12/31/19   ·   Accession #:  1287808-20-14   ·   File #:  1-33961

Previous ‘10-K’:  ‘10-K’ on 4/1/19 for 12/31/18   ·   Next:  ‘10-K’ on 3/16/21 for 12/31/20   ·   Latest:  ‘10-K/A’ on 5/2/22 for 12/31/21

Find Words in Filings emoji
 		  in    Show  and   ↓Hints

  As Of               Filer                 Filing    For·On·As Docs:Size

 3/26/20  Hill International, Inc.          10-K       12/31/19  104:12M

Annual Report   —   Form 10-K   —   Sect. 13 / 15(d) – SEA’34
Filing Table of Contents

Document/Exhibit                   Description                      Pages   Size 

 1: 10-K        Annual Report                                       HTML   1.69M 
 2: EX-4.2      Instrument Defining the Rights of Security Holders  HTML     39K 
 3: EX-21       Subsidiaries List                                   HTML     43K 
 4: EX-23.1     Exhibit 23.1 - Grant Thornton                       HTML     29K 
 5: EX-23.2     Consent of Experts or Counsel                       HTML     30K 
 6: EX-31.1     Certification -- §302 - SOA'02                      HTML     34K 
 7: EX-31.2     Certification -- §302 - SOA'02                      HTML     34K 
 8: EX-32.1     Certification -- §906 - SOA'02                      HTML     29K 
 9: EX-32.2     Certification -- §906 - SOA'02                      HTML     29K 
49: R1          Cover Page                                          HTML     92K 
102: R2          Consolidated Balance Sheets                         HTML    162K  
74: R3          Consolidated Balance Sheets (Parenthetical)         HTML     44K 
30: R4          Consolidated Statements of Operations               HTML    125K 
48: R5          Consolidated Statements of Comprehensive Income     HTML     47K 
                (Loss)                                                           
101: R6          Consolidated Statements of Stockholders' Equity     HTML     99K  
73: R7          Consolidated Statements of Cash Flows               HTML    150K 
31: R8          The Company                                         HTML     33K 
43: R9          Liquidity                                           HTML     33K 
65: R10         Summary of Significant Accounting Policies          HTML    168K 
94: R11         Revenue from Contracts with Clients                 HTML    110K 
39: R12         Accounts Receivable                                 HTML     66K 
24: R13         Property and Equipment                              HTML     57K 
64: R14         Intangible Assets                                   HTML     61K 
93: R15         Goodwill                                            HTML     38K 
38: R16         Accounts Payable and Accrued Expenses               HTML     45K 
23: R17         Notes Payable and Long-Term Debt                    HTML    131K 
63: R18         Share-Based Compensation                            HTML    202K 
95: R19         Stockholders' Equity                                HTML     36K 
59: R20         Income Taxes                                        HTML    182K 
22: R21         Commitments and Contingencies                       HTML     50K 
81: R22         Operating Leases                                    HTML     47K 
89: R23         Benefit Plans                                       HTML     36K 
58: R24         Segment and Related Information                     HTML    116K 
21: R25         Subsequent Event                                    HTML     33K 
80: R26         Schedule II Valuation and Qualifying Accounts       HTML     50K 
88: R27         Summary of Significant Accounting Policies          HTML    165K 
                (Policies)                                                       
60: R28         Summary of Significant Accounting Policies          HTML    103K 
                (Tables)                                                         
20: R29         Revenue from Contracts with Clients (Tables)        HTML     76K 
25: R30         Accounts Receivable (Tables)                        HTML     64K 
41: R31         Property and Equipment (Tables)                     HTML     59K 
90: R32         Intangible Assets (Tables)                          HTML     61K 
61: R33         Goodwill (Tables)                                   HTML     35K 
26: R34         Accounts Payable and Accrued Expenses (Tables)      HTML     45K 
42: R35         Notes Payable and Long-Term Debt (Tables)           HTML    115K 
91: R36         Share-Based Compensation (Tables)                   HTML    187K 
62: R37         Income Taxes (Tables)                               HTML    176K 
28: R38         Operating Leases (Tables)                           HTML     42K 
40: R39         Segment and Related Information (Tables)            HTML    126K 
15: R40         The Company (Details)                               HTML     30K 
54: R41         Liquidity (Details)                                 HTML     43K 
85: R42         Summary of Significant Accounting Policies -        HTML     43K 
                Reclassification (Details)                                       
78: R43         Summary of Significant Accounting Policies - Other  HTML     35K 
                Income, net (Details)                                            
16: R44         Summary of Significant Accounting Policies -        HTML     58K 
                Restricted Cash and Concentrations of Credit Risk                
                (Details)                                                        
55: R45         Summary of Significant Accounting Policies -        HTML     38K 
                Property and Equipment (Details)                                 
86: R46         Summary of Significant Accounting Policies -        HTML     42K 
                Intangible Assets and Goodwill (Details)                         
79: R47         Summary of Significant Accounting Policies -        HTML     38K 
                Investments (Details)                                            
17: R48         Summary of Significant Accounting Policies -        HTML     35K 
                General Policies (Details)                                       
53: R49         Summary of Significant Accounting Policies -        HTML     65K 
                Earnings Per Share (Details)                                     
45: R50         Summary of Significant Accounting Policies -        HTML     34K 
                Accounting Pronouncements (Details)                              
33: R51         Revenue from Contracts with Clients - Narrative     HTML     46K 
                (Details)                                                        
72: R52         Revenue from Contracts with Clients -               HTML     66K 
                Disaggregation of Revenue (Details)                              
104: R53         Accounts Receivable - Components of Accounts        HTML     53K  
                Receivable (Details)                                             
44: R54         Accounts Receivable - Allowance for Doubtful        HTML     39K 
                Accounts (Details)                                               
32: R55         Property and Equipment (Details)                    HTML     53K 
71: R56         Intangible Assets - Summary of Acquired Intangible  HTML     39K 
                Assets (Details)                                                 
103: R57         Intangible Assets - Estimated Amortization Expense  HTML     48K  
                (Details)                                                        
47: R58         Goodwill (Details)                                  HTML     38K 
29: R59         Accounts Payable and Accrued Expenses (Details)     HTML     53K 
77: R60         Notes Payable and Long-Term Debt - Summary of       HTML     77K 
                Outstanding Debt Obligations (Details)                           
83: R61         Notes Payable and Long-Term Debt - Term Loan        HTML     95K 
                Facilities and Revolving Credit Facilities                       
                (Details)                                                        
57: R62         Notes Payable and Long-Term Debt - Other Financing  HTML     45K 
                Arrangements (Details)                                           
19: R63         Notes Payable and Long-Term Debt - Maturities       HTML     47K 
                (Details)                                                        
76: R64         Share-Based Compensation - Narrative (Details)      HTML    110K 
82: R65         Share-Based Compensation - Share-Based              HTML     42K 
                Compensation Expense (Details)                                   
56: R66         Share-Based Compensation - Schedules (Details)      HTML     61K 
18: R67         Share-Based Compensation - Assumptions Used         HTML     47K 
                (Details)                                                        
75: R68         Share-Based Compensation - Award Activity           HTML     75K 
                (Details)                                                        
84: R69         Share-Based Compensation - Outstanding and          HTML     90K 
                Exercisable (Details)                                            
97: R70         Stockholders' Equity (Details)                      HTML     61K 
66: R71         Income Taxes - Components of Earnings and Income    HTML     85K 
                Tax Expense (Benefit) (Details)                                  
34: R72         Income Taxes - Reconciliation of Income Taxes and   HTML    140K 
                Deferred Tax Assets & Liabilities (Details)                      
50: R73         Income Taxes - Valuation Allowance for Deferred     HTML     36K 
                Tax Asset (Details)                                              
100: R74         Income Taxes - Uncertain Tax Positions (Details)    HTML     59K  
68: R75         Commitments and Contingencies (Details)             HTML     53K 
36: R76         Operating Leases (Details)                          HTML     69K 
52: R77         Benefit Plans (Details)                             HTML     54K 
96: R78         Segment and Related Information - Revenue by        HTML     65K 
                Geographic Region (Details)                                      
70: R79         Segment and Related Information - Operating (Loss)  HTML     46K 
                Profit (Details)                                                 
98: R80         Segment and Related Information - Depreciation and  HTML     35K 
                Amortization Expense (Details)                                   
67: R81         Segment and Related Information - Revenue by        HTML     50K 
                Client Type (Details)                                            
35: R82         Segment and Related Information - Property, Plant   HTML     44K 
                and Equipment, Net by Geographic Region (Details)                
51: R83         Subsequent Event (Details)                          HTML     30K 
99: R84         Schedule II Valuation and Qualifying Accounts -     HTML     39K 
                Allowance for Uncollectible Receivables (Details)                
27: R9999       Uncategorized Items - hil-12312019x10k.htm          HTML     26K 
92: XML         IDEA XML File -- Filing Summary                      XML    184K 
69: XML         XBRL Instance -- hil-12312019x10k_htm                XML   3.11M 
46: EXCEL       IDEA Workbook of Financial Reports                  XLSX    127K 
11: EX-101.CAL  XBRL Calculations -- hil-20191231_cal                XML    339K 
12: EX-101.DEF  XBRL Definitions -- hil-20191231_def                 XML    842K 
13: EX-101.LAB  XBRL Labels -- hil-20191231_lab                      XML   2.34M 
14: EX-101.PRE  XBRL Presentations -- hil-20191231_pre               XML   1.37M 
10: EX-101.SCH  XBRL Schema -- hil-20191231                          XSD    215K 
37: JSON        XBRL Instance as JSON Data -- MetaLinks              494±   747K 
87: ZIP         XBRL Zipped Folder -- 0001287808-20-000014-xbrl      Zip    409K

‘JSON’   —   XBRL Instance as JSON Data — MetaLinks

This File is an XBRL Instance as JavaScript Object Notation (JSON) Data.


{
"instance":  {
    "hil-12312019x10k.htm":  {
        "axisCustom":  0,
        "axisStandard":  34,
        "contextCount":  323,
        "dts":  {
            "calculationLink":  {
                "local":  [
                    "hil-20191231_cal.xml"
                    ]
                },
            "definitionLink":  {
                "local":  [
                    "hil-20191231_def.xml"
                    ],
                "remote":  [
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-eedm-def-2019-01-31.xml",
                    "http://xbrl.fasb.org/srt/2019/elts/srt-eedm1-def-2019-01-31.xml"
                    ]
                },
            "inline":  {
                "local":  [
                    "hil-12312019x10k.htm"
                    ]
                },
            "labelLink":  {
                "local":  [
                    "hil-20191231_lab.xml"
                    ],
                "remote":  [
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-doc-2019-01-31.xml",
                    "https://xbrl.sec.gov/dei/2019/dei-doc-2019-01-31.xml",
                    "http://xbrl.fasb.org/srt/2019/elts/srt-doc-2019-01-31.xml"
                    ]
                },
            "presentationLink":  {
                "local":  [
                    "hil-20191231_pre.xml"
                    ]
                },
            "referenceLink":  {
                "remote":  [
                    "https://xbrl.sec.gov/dei/2019/dei-ref-2019-01-31.xml",
                    "http://xbrl.fasb.org/srt/2019/elts/srt-ref-2019-01-31.xml",
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-ref-2019-01-31.xml"
                    ]
                },
            "schema":  {
                "local":  [
                    "hil-20191231.xsd"
                    ],
                "remote":  [
                    "http://xbrl.fasb.org/srt/2019/elts/srt-types-2019-01-31.xsd",
                    "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd",
                    "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd",
                    "http://www.xbrl.org/2003/xl-2003-12-31.xsd",
                    "http://www.xbrl.org/2003/xlink-2003-12-31.xsd",
                    "http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd",
                    "http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd",
                    "http://www.xbrl.org/2006/ref-2006-02-27.xsd",
                    "http://xbrl.fasb.org/srt/2019/elts/srt-2019-01-31.xsd",
                    "http://www.xbrl.org/2005/xbrldt-2005.xsd",
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-2019-01-31.xsd",
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-roles-2019-01-31.xsd",
                    "http://xbrl.fasb.org/srt/2019/elts/srt-roles-2019-01-31.xsd",
                    "https://xbrl.sec.gov/country/2017/country-2017-01-31.xsd",
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-types-2019-01-31.xsd",
                    "http://www.xbrl.org/lrr/arcrole/factExplanatory-2009-12-16.xsd",
                    "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd",
                    "http://www.xbrl.org/lrr/role/net-2009-12-16.xsd",
                    "https://xbrl.sec.gov/currency/2019/currency-2019-01-31.xsd",
                    "https://xbrl.sec.gov/dei/2019/dei-2019-01-31.xsd",
                    "https://xbrl.sec.gov/exch/2019/exch-2019-01-31.xsd",
                    "http://xbrl.sec.gov/naics/2017/naics-2017-01-31.xsd",
                    "http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd",
                    "https://xbrl.sec.gov/stpr/2018/stpr-2018-01-31.xsd",
                    "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd",
                    "http://www.xbrl.org/lrr/role/deprecated-2009-12-16.xsd",
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-parts-codification-2019-01-31.xsd"
                    ]
                }
            },
        "elementCount":  772,
        "entityCount":  1,
        "hidden":  {
            "http://fasb.org/us-gaap/2019-01-31":  23,
            "http://xbrl.sec.gov/dei/2019-01-31":  5,
            "total":  28
            },
        "keyCustom":  68,
        "keyStandard":  479,
        "memberCustom":  53,
        "memberStandard":  54,
        "nsprefix":  "hil",
        "nsuri":  "http://www.hillintl.com/20191231",
        "report":  {
            "R1":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "dei:DocumentType",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "document",
                "isDefault":  "true",
                "longName":  "0001000 - Document - COVER PAGE",
                "role":  "http://www.hillintl.com/role/CoverPage",
                "shortName":  "COVER PAGE",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "dei:DocumentType",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R10":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2103100 - Disclosure - Summary of Significant Accounting Policies",
                "role":  "http://www.hillintl.com/role/SummaryOfSignificantAccountingPolicies",
                "shortName":  "Summary of Significant Accounting Policies",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:BasisOfPresentationAndSignificantAccountingPoliciesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R11":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:RevenueFromContractWithCustomerTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2104100 - Disclosure - Revenue from Contracts with Clients",
                "role":  "http://www.hillintl.com/role/RevenueFromContractsWithClients",
                "shortName":  "Revenue from Contracts with Clients",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:RevenueFromContractWithCustomerTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R12":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2106100 - Disclosure - Accounts Receivable",
                "role":  "http://www.hillintl.com/role/AccountsReceivable",
                "shortName":  "Accounts Receivable",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R13":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2107100 - Disclosure - Property and Equipment",
                "role":  "http://www.hillintl.com/role/PropertyAndEquipment",
                "shortName":  "Property and Equipment",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:PropertyPlantAndEquipmentDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R14":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:IntangibleAssetsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2108100 - Disclosure - Intangible Assets",
                "role":  "http://www.hillintl.com/role/IntangibleAssets",
                "shortName":  "Intangible Assets",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:IntangibleAssetsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R15":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:GoodwillDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2109100 - Disclosure - Goodwill",
                "role":  "http://www.hillintl.com/role/Goodwill",
                "shortName":  "Goodwill",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:GoodwillDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R16":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2110100 - Disclosure - Accounts Payable and Accrued Expenses",
                "role":  "http://www.hillintl.com/role/AccountsPayableAndAccruedExpenses",
                "shortName":  "Accounts Payable and Accrued Expenses",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R17":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:DebtDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2111100 - Disclosure - Notes Payable and Long-Term Debt",
                "role":  "http://www.hillintl.com/role/NotesPayableAndLongTermDebt",
                "shortName":  "Notes Payable and Long-Term Debt",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:DebtDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R18":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2112100 - Disclosure - Share-Based Compensation",
                "role":  "http://www.hillintl.com/role/ShareBasedCompensation",
                "shortName":  "Share-Based Compensation",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R19":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2113100 - Disclosure - Stockholders' Equity",
                "role":  "http://www.hillintl.com/role/StockholdersEquity",
                "shortName":  "Stockholders' Equity",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:StockholdersEquityNoteDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R2":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CashAndCashEquivalentsAtCarryingValue",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1001000 - Statement - CONSOLIDATED BALANCE SHEETS",
                "role":  "http://www.hillintl.com/role/ConsolidatedBalanceSheets",
                "shortName":  "CONSOLIDATED BALANCE SHEETS",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:DueFromAffiliateCurrent",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R20":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:IncomeTaxDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2114100 - Disclosure - Income Taxes",
                "role":  "http://www.hillintl.com/role/IncomeTaxes",
                "shortName":  "Income Taxes",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:IncomeTaxDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R21":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2115100 - Disclosure - Commitments and Contingencies",
                "role":  "http://www.hillintl.com/role/CommitmentsAndContingencies",
                "shortName":  "Commitments and Contingencies",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R22":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:LeasesOfLesseeDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2116100 - Disclosure - Operating Leases",
                "role":  "http://www.hillintl.com/role/OperatingLeases",
                "shortName":  "Operating Leases",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:LeasesOfLesseeDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R23":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2117100 - Disclosure - Benefit Plans",
                "role":  "http://www.hillintl.com/role/BenefitPlans",
                "shortName":  "Benefit Plans",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R24":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:SegmentReportingDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2118100 - Disclosure - Segment and Related Information",
                "role":  "http://www.hillintl.com/role/SegmentAndRelatedInformation",
                "shortName":  "Segment and Related Information",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:SegmentReportingDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R25":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:SubsequentEventsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2119100 - Disclosure - Subsequent Event",
                "role":  "http://www.hillintl.com/role/SubsequentEvent",
                "shortName":  "Subsequent Event",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:SubsequentEventsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R26":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "srt:ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "",
                "isDefault":  "false",
                "longName":  "2120100 - Schedule - Schedule II Valuation and Qualifying Accounts",
                "role":  "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccounts",
                "shortName":  "Schedule II Valuation and Qualifying Accounts",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "srt:ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R27":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:BasisOfAccountingPolicyPolicyTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2203201 - Disclosure - Summary of Significant Accounting Policies (Policies)",
                "role":  "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies",
                "shortName":  "Summary of Significant Accounting Policies (Policies)",
                "subGroupType":  "policies",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:BasisOfAccountingPolicyPolicyTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R28":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2303302 - Disclosure - Summary of Significant Accounting Policies (Tables)",
                "role":  "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesTables",
                "shortName":  "Summary of Significant Accounting Policies (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfCashAndCashEquivalentsTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R29":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:DisaggregationOfRevenueTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2304301 - Disclosure - Revenue from Contracts with Clients (Tables)",
                "role":  "http://www.hillintl.com/role/RevenueFromContractsWithClientsTables",
                "shortName":  "Revenue from Contracts with Clients (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:DisaggregationOfRevenueTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R3":  {
                "firstAnchor":  null,
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1001501 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)",
                "role":  "http://www.hillintl.com/role/ConsolidatedBalanceSheetsParenthetical",
                "shortName":  "CONSOLIDATED BALANCE SHEETS (Parenthetical)",
                "subGroupType":  "parenthetical",
                "uniqueAnchor":  null
                },
            "R30":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2306301 - Disclosure - Accounts Receivable (Tables)",
                "role":  "http://www.hillintl.com/role/AccountsReceivableTables",
                "shortName":  "Accounts Receivable (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R31":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:PropertyPlantAndEquipmentTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2307301 - Disclosure - Property and Equipment (Tables)",
                "role":  "http://www.hillintl.com/role/PropertyAndEquipmentTables",
                "shortName":  "Property and Equipment (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:PropertyPlantAndEquipmentTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R32":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2308301 - Disclosure - Intangible Assets (Tables)",
                "role":  "http://www.hillintl.com/role/IntangibleAssetsTables",
                "shortName":  "Intangible Assets (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R33":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfGoodwillTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2309301 - Disclosure - Goodwill (Tables)",
                "role":  "http://www.hillintl.com/role/GoodwillTables",
                "shortName":  "Goodwill (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfGoodwillTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R34":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2310301 - Disclosure - Accounts Payable and Accrued Expenses (Tables)",
                "role":  "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesTables",
                "shortName":  "Accounts Payable and Accrued Expenses (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R35":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfDebtInstrumentsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2311301 - Disclosure - Notes Payable and Long-Term Debt (Tables)",
                "role":  "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTables",
                "shortName":  "Notes Payable and Long-Term Debt (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfDebtInstrumentsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R36":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2312301 - Disclosure - Share-Based Compensation (Tables)",
                "role":  "http://www.hillintl.com/role/ShareBasedCompensationTables",
                "shortName":  "Share-Based Compensation (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R37":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2314301 - Disclosure - Income Taxes (Tables)",
                "role":  "http://www.hillintl.com/role/IncomeTaxesTables",
                "shortName":  "Income Taxes (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R38":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2316301 - Disclosure - Operating Leases (Tables)",
                "role":  "http://www.hillintl.com/role/OperatingLeasesTables",
                "shortName":  "Operating Leases (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R39":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfRevenueFromExternalCustomersAttributedToForeignCountriesByGeographicAreaTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2318301 - Disclosure - Segment and Related Information (Tables)",
                "role":  "http://www.hillintl.com/role/SegmentAndRelatedInformationTables",
                "shortName":  "Segment and Related Information (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfRevenueFromExternalCustomersAttributedToForeignCountriesByGeographicAreaTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R4":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:DisaggregationOfRevenueTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1002000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS",
                "role":  "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                "shortName":  "CONSOLIDATED STATEMENTS OF OPERATIONS",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:CostOfRevenue",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R40":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-2",
                    "first":  true,
                    "lang":  null,
                    "name":  "hil:NumberofProfessionals",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "professional",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2401401 - Disclosure - The Company (Details)",
                "role":  "http://www.hillintl.com/role/CompanyDetails",
                "shortName":  "The Company (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-2",
                    "first":  true,
                    "lang":  null,
                    "name":  "hil:NumberofProfessionals",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "professional",
                    "xsiNil":  "false"
                    }
                },
            "R41":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CashAndCashEquivalentsAtCarryingValue",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2402401 - Disclosure - Liquidity (Details)",
                "role":  "http://www.hillintl.com/role/LiquidityDetails",
                "shortName":  "Liquidity (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  null
                },
            "R42":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "hil:IncomeLossFromDiscontinuedOperationsBeforeGainLossofDiscontinuedOperationNetofTax",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2403403 - Disclosure - Summary of Significant Accounting Policies - Reclassification (Details)",
                "role":  "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesReclassificationDetails",
                "shortName":  "Summary of Significant Accounting Policies - Reclassification (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:PriorPeriodReclassificationAdjustmentDescription",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2018Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:ProceedsFromRepaymentsOfLinesOfCredit",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R43":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OtherNonoperatingIncomeExpense",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2403404 - Disclosure - Summary of Significant Accounting Policies - Other Income, net (Details)",
                "role":  "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesOtherIncomeNetDetails",
                "shortName":  "Summary of Significant Accounting Policies - Other Income, net (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "hil:AmountofGrantReceived",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R44":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "hil:MinimumCompletionPeriodOfProject",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2403405 - Disclosure - Summary of Significant Accounting Policies - Restricted Cash and Concentrations of Credit Risk (Details)",
                "role":  "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails",
                "shortName":  "Summary of Significant Accounting Policies - Restricted Cash and Concentrations of Credit Risk (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "hil:MinimumCompletionPeriodOfProject",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R45":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD_us-gaap_PropertyPlantAndEquipmentByTypeAxis_us-gaap_FurnitureAndFixturesMember",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:PropertyPlantAndEquipmentUsefulLife",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2403406 - Disclosure - Summary of Significant Accounting Policies - Property and Equipment (Details)",
                "role":  "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails",
                "shortName":  "Summary of Significant Accounting Policies - Property and Equipment (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD_us-gaap_PropertyPlantAndEquipmentByTypeAxis_us-gaap_FurnitureAndFixturesMember",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:PropertyPlantAndEquipmentUsefulLife",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R46":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:FiniteLivedIntangibleAssetUsefulLife",
                    "reportCount":  1,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2403407 - Disclosure - Summary of Significant Accounting Policies - Intangible Assets and Goodwill (Details)",
                "role":  "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAndGoodwillDetails",
                "shortName":  "Summary of Significant Accounting Policies - Intangible Assets and Goodwill (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD_srt_RangeAxis_srt_MaximumMember",
                    "decimals":  null,
                    "lang":  "en-US",
                    "name":  "us-gaap:FiniteLivedIntangibleAssetUsefulLife",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R47":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LongTermInvestments",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2403408 - Disclosure - Summary of Significant Accounting Policies - Investments (Details)",
                "role":  "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesInvestmentsDetails",
                "shortName":  "Summary of Significant Accounting Policies - Investments (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4_us-gaap_FinancialInstrumentAxis_hil_RampedMetroJointVentureMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:LongTermInvestments",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R48":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "ix:continuation",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:DeferredRentCredit",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2403409 - Disclosure - Summary of Significant Accounting Policies - General Policies (Details)",
                "role":  "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesGeneralPoliciesDetails",
                "shortName":  "Summary of Significant Accounting Policies - General Policies (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "ix:continuation",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:DeferredRentCredit",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R49":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2403410 - Disclosure - Summary of Significant Accounting Policies - Earnings Per Share (Details)",
                "role":  "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails",
                "shortName":  "Summary of Significant Accounting Policies - Earnings Per Share (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R5":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ProfitLoss",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1003000 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)",
                "role":  "http://www.hillintl.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss",
                "shortName":  "CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R50":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeaseRightOfUseAsset",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2403411 - Disclosure - Summary of Significant Accounting Policies - Accounting Pronouncements (Details)",
                "role":  "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesAccountingPronouncementsDetails",
                "shortName":  "Summary of Significant Accounting Policies - Accounting Pronouncements (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "I2019Q1Jan1_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_us-gaap_AccountingStandardsUpdate201602Member",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeaseRightOfUseAsset",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R51":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:NumberOfOperatingSegments",
                    "reportCount":  1,
                    "unitRef":  "segment",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2404402 - Disclosure - Revenue from Contracts with Clients - Narrative (Details)",
                "role":  "http://www.hillintl.com/role/RevenueFromContractsWithClientsNarrativeDetails",
                "shortName":  "Revenue from Contracts with Clients - Narrative (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:ContractWithCustomerLiabilityRevenueRecognized",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R52":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:DisaggregationOfRevenueTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2404403 - Disclosure - Revenue from Contracts with Clients - Disaggregation of Revenue (Details)",
                "role":  "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails",
                "shortName":  "Revenue from Contracts with Clients - Disaggregation of Revenue (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:DisaggregationOfRevenueTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD_srt_StatementGeographicalAxis_country_US",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:RevenueFromContractWithCustomerIncludingAssessedTax",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R53":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:BilledContractReceivables",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2406402 - Disclosure - Accounts Receivable - Components of Accounts Receivable (Details)",
                "role":  "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails",
                "shortName":  "Accounts Receivable - Components of Accounts Receivable (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:BilledContractReceivables",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R54":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2018Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AllowanceForDoubtfulAccountsReceivable",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2406403 - Disclosure - Accounts Receivable - Allowance for Doubtful Accounts (Details)",
                "role":  "http://www.hillintl.com/role/AccountsReceivableAllowanceForDoubtfulAccountsDetails",
                "shortName":  "Accounts Receivable - Allowance for Doubtful Accounts (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2018Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AllowanceForDoubtfulAccountsReceivable",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R55":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:PropertyPlantAndEquipmentTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:PropertyPlantAndEquipmentGross",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2407402 - Disclosure - Property and Equipment (Details)",
                "role":  "http://www.hillintl.com/role/PropertyAndEquipmentDetails",
                "shortName":  "Property and Equipment (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:PropertyPlantAndEquipmentTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:PropertyPlantAndEquipmentGross",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R56":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:FiniteLivedIntangibleAssetsGross",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2408402 - Disclosure - Intangible Assets - Summary of Acquired Intangible Assets (Details)",
                "role":  "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails",
                "shortName":  "Intangible Assets - Summary of Acquired Intangible Assets (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:FiniteLivedIntangibleAssetsGross",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R57":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AmortizationOfIntangibleAssets",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2408403 - Disclosure - Intangible Assets - Estimated Amortization Expense (Details)",
                "role":  "http://www.hillintl.com/role/IntangibleAssetsEstimatedAmortizationExpenseDetails",
                "shortName":  "Intangible Assets - Estimated Amortization Expense (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AmortizationOfIntangibleAssets",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R58":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2018Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:Goodwill",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2409402 - Disclosure - Goodwill (Details)",
                "role":  "http://www.hillintl.com/role/GoodwillDetails",
                "shortName":  "Goodwill (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfGoodwillTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2017Q4",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:Goodwill",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R59":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AccountsPayableCurrent",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2410402 - Disclosure - Accounts Payable and Accrued Expenses (Details)",
                "role":  "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails",
                "shortName":  "Accounts Payable and Accrued Expenses (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AccountsPayableCurrent",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R6":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2017Q4_us-gaap_StatementEquityComponentsAxis_us-gaap_CommonStockMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CommonStockSharesIssued",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1004000 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY",
                "role":  "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity",
                "shortName":  "CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2017Q4_us-gaap_StatementEquityComponentsAxis_us-gaap_CommonStockMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CommonStockSharesIssued",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    }
                },
            "R60":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfDebtInstrumentsTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:DebtInstrumentCarryingAmount",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2411402 - Disclosure - Notes Payable and Long-Term Debt - Summary of Outstanding Debt Obligations (Details)",
                "role":  "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails",
                "shortName":  "Notes Payable and Long-Term Debt - Summary of Outstanding Debt Obligations (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfDebtInstrumentsTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:DebtInstrumentCarryingAmount",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R61":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfDebtInstrumentsTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LongTermDebt",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2411403 - Disclosure - Notes Payable and Long-Term Debt - Term Loan Facilities and Revolving Credit Facilities (Details)",
                "role":  "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails",
                "shortName":  "Notes Payable and Long-Term Debt - Term Loan Facilities and Revolving Credit Facilities (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "I2017Q2May05_us-gaap_DebtInstrumentAxis_hil_SecuredTermLoanMember",
                    "decimals":  "INF",
                    "lang":  null,
                    "name":  "us-gaap:DebtInstrumentFaceAmount",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R62":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfDebtInstrumentsTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LongTermDebt",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2411404 - Disclosure - Notes Payable and Long-Term Debt - Other Financing Arrangements (Details)",
                "role":  "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails",
                "shortName":  "Notes Payable and Long-Term Debt - Other Financing Arrangements (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "I2019Q2May1_us-gaap_DebtInstrumentAxis_hil_PremiumFinancingAgreementwithAFCOPremiumCreditLLCMember_us-gaap_LongtermDebtTypeAxis_us-gaap_NotesPayableOtherPayablesMember",
                    "decimals":  "INF",
                    "lang":  null,
                    "name":  "us-gaap:DebtInstrumentFaceAmount",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R63":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2411405 - Disclosure - Notes Payable and Long-Term Debt - Maturities (Details)",
                "role":  "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails",
                "shortName":  "Notes Payable and Long-Term Debt - Maturities (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R64":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2412402 - Disclosure - Share-Based Compensation - Narrative (Details)",
                "role":  "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                "shortName":  "Share-Based Compensation - Narrative (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    }
                },
            "R65":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AllocatedShareBasedCompensationExpense",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2412403 - Disclosure - Share-Based Compensation - Share-Based Compensation Expense (Details)",
                "role":  "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails",
                "shortName":  "Share-Based Compensation - Share-Based Compensation Expense (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD_us-gaap_AwardTypeAxis_us-gaap_CommonStockMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:AllocatedShareBasedCompensationExpense",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R66":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfOtherShareBasedCompensationActivityTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2018Q4_us-gaap_AwardTypeAxis_us-gaap_RestrictedStockUnitsRSUMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber",
                    "reportCount":  1,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2412404 - Disclosure - Share-Based Compensation - Schedules (Details)",
                "role":  "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails",
                "shortName":  "Share-Based Compensation - Schedules (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfOtherShareBasedCompensationActivityTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2017Q4_us-gaap_AwardTypeAxis_us-gaap_RestrictedStockUnitsRSUMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    }
                },
            "R67":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2412405 - Disclosure - Share-Based Compensation - Assumptions Used (Details)",
                "role":  "http://www.hillintl.com/role/ShareBasedCompensationAssumptionsUsedDetails",
                "shortName":  "Share-Based Compensation - Assumptions Used (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R68":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2018Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber",
                    "reportCount":  1,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2412406 - Disclosure - Share-Based Compensation - Award Activity (Details)",
                "role":  "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails",
                "shortName":  "Share-Based Compensation - Award Activity (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2017Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:StockIssuedDuringPeriodSharesStockOptionsExercised",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    }
                },
            "R69":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2412407 - Disclosure - Share-Based Compensation - Outstanding and Exercisable (Details)",
                "role":  "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails",
                "shortName":  "Share-Based Compensation - Outstanding and Exercisable (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    }
                },
            "R7":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ProfitLoss",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1005000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS",
                "role":  "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows",
                "shortName":  "CONSOLIDATED STATEMENTS OF CASH FLOWS",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:ProvisionForDoubtfulAccounts",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R70":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "2",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice",
                    "reportCount":  1,
                    "unitRef":  "usdPerShare",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2413401 - Disclosure - Stockholders' Equity (Details)",
                "role":  "http://www.hillintl.com/role/StockholdersEquityDetails",
                "shortName":  "Stockholders' Equity (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "I2018Q1Feb28_us-gaap_BusinessAcquisitionAxis_hil_EngineeringSAMember",
                    "decimals":  "2",
                    "lang":  null,
                    "name":  "us-gaap:BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    }
                },
            "R71":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:EffectiveIncomeTaxRateContinuingOperations",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2414402 - Disclosure - Income Taxes - Components of Earnings and Income Tax Expense (Benefit) (Details)",
                "role":  "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails",
                "shortName":  "Income Taxes - Components of Earnings and Income Tax Expense (Benefit) (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:EffectiveIncomeTaxRateContinuingOperations",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    }
                },
            "R72":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2414403 - Disclosure - Income Taxes - Reconciliation of Income Taxes and Deferred Tax Assets & Liabilities (Details)",
                "role":  "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails",
                "shortName":  "Income Taxes - Reconciliation of Income Taxes and Deferred Tax Assets & Liabilities (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R73":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2018Q4_us-gaap_ValuationAllowancesAndReservesTypeAxis_us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ValuationAllowancesAndReservesBalance",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2414404 - Disclosure - Income Taxes - Valuation Allowance for Deferred Tax Asset (Details)",
                "role":  "http://www.hillintl.com/role/IncomeTaxesValuationAllowanceForDeferredTaxAssetDetails",
                "shortName":  "Income Taxes - Valuation Allowance for Deferred Tax Asset (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  null
                },
            "R74":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2018Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:UnrecognizedTaxBenefits",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2414405 - Disclosure - Income Taxes - Uncertain Tax Positions (Details)",
                "role":  "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails",
                "shortName":  "Income Taxes - Uncertain Tax Positions (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2017Q4",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:UnrecognizedTaxBenefits",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R75":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LossContingencyLossInPeriod",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2415401 - Disclosure - Commitments and Contingencies (Details)",
                "role":  "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails",
                "shortName":  "Commitments and Contingencies (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "hil:OffBalanceSheetArrangementsMaximumPotentialFuturePayment",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R76":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeaseCost",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2416402 - Disclosure - Operating Leases (Details)",
                "role":  "http://www.hillintl.com/role/OperatingLeasesDetails",
                "shortName":  "Operating Leases (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeaseCost",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R77":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "hil:DefinedContributionPlanEligibilityCriteriaMinimumAgeOfEmployees",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2417401 - Disclosure - Benefit Plans (Details)",
                "role":  "http://www.hillintl.com/role/BenefitPlansDetails",
                "shortName":  "Benefit Plans (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "hil:DefinedContributionPlanEligibilityCriteriaMinimumAgeOfEmployees",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R78":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:NumberOfOperatingSegments",
                    "reportCount":  1,
                    "unitRef":  "segment",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2418402 - Disclosure - Segment and Related Information - Revenue by Geographic Region (Details)",
                "role":  "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails",
                "shortName":  "Segment and Related Information - Revenue by Geographic Region (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfRevenueFromExternalCustomersAttributedToForeignCountriesByGeographicAreaTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD_us-gaap_ConcentrationRiskByTypeAxis_us-gaap_GeographicConcentrationRiskMember",
                    "decimals":  "3",
                    "lang":  null,
                    "name":  "us-gaap:ConcentrationRiskPercentage1",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    }
                },
            "R79":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingIncomeLoss",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2418403 - Disclosure - Segment and Related Information - Operating (Loss) Profit (Details)",
                "role":  "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails",
                "shortName":  "Segment and Related Information - Operating (Loss) Profit (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD_srt_ConsolidationItemsAxis_us-gaap_CorporateNonSegmentMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:OperatingIncomeLoss",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R8":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:NatureOfOperations",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2101100 - Disclosure - The Company",
                "role":  "http://www.hillintl.com/role/Company",
                "shortName":  "The Company",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:NatureOfOperations",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R80":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "hil:DepreciationDepletionAndAmortizationExcludingAmortizationOfLoanFees",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2418404 - Disclosure - Segment and Related Information - Depreciation and Amortization Expense (Details)",
                "role":  "http://www.hillintl.com/role/SegmentAndRelatedInformationDepreciationAndAmortizationExpenseDetails",
                "shortName":  "Segment and Related Information - Depreciation and Amortization Expense (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD_srt_ConsolidationItemsAxis_us-gaap_OperatingSegmentsMember_us-gaap_StatementBusinessSegmentsAxis_hil_ProjectManagementMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "hil:DepreciationDepletionAndAmortizationExcludingAmortizationOfLoanFees",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R81":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "hil:ScheduleOfRevenueFromClientTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:Revenues",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2418405 - Disclosure - Segment and Related Information - Revenue by Client Type (Details)",
                "role":  "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails",
                "shortName":  "Segment and Related Information - Revenue by Client Type (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "hil:ScheduleOfRevenueFromClientTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD_srt_MajorCustomersAxis_hil_UsFederalGovernmentMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:Revenues",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R82":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:PropertyPlantAndEquipmentNet",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2418406 - Disclosure - Segment and Related Information - Property, Plant and Equipment, Net by Geographic Region (Details)",
                "role":  "http://www.hillintl.com/role/SegmentAndRelatedInformationPropertyPlantAndEquipmentNetByGeographicRegionDetails",
                "shortName":  "Segment and Related Information - Property, Plant and Equipment, Net by Geographic Region (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2019Q4_srt_StatementGeographicalAxis_hil_TheUnitedStatesOfAmericaAndCanadaMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:PropertyPlantAndEquipmentNet",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R83":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "D2020Q1Feb3_us-gaap_SubsequentEventTypeAxis_us-gaap_SubsequentEventMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "hil:PaymentsforPenalty",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2419401 - Disclosure - Subsequent Event (Details)",
                "role":  "http://www.hillintl.com/role/SubsequentEventDetails",
                "shortName":  "Subsequent Event (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "D2020Q1Feb3_us-gaap_SubsequentEventTypeAxis_us-gaap_SubsequentEventMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "hil:PaymentsforPenalty",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R84":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "srt:ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2018Q4_us-gaap_ValuationAllowancesAndReservesTypeAxis_us-gaap_AllowanceForCreditLossMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ValuationAllowancesAndReservesBalance",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2420401 - Disclosure - Schedule II Valuation and Qualifying Accounts - Allowance for Uncollectible Receivables (Details)",
                "role":  "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccountsAllowanceForUncollectibleReceivablesDetails",
                "shortName":  "Schedule II Valuation and Qualifying Accounts - Allowance for Uncollectible Receivables (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "srt:ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FI2017Q4_us-gaap_ValuationAllowancesAndReservesTypeAxis_us-gaap_AllowanceForCreditLossMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:ValuationAllowancesAndReservesBalance",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R9":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "hil:LiquidityRelatedToCollectionsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2102100 - Disclosure - Liquidity",
                "role":  "http://www.hillintl.com/role/Liquidity",
                "shortName":  "Liquidity",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "hil:LiquidityRelatedToCollectionsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R9999":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "ix:continuation",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "hil-12312019x10k.htm",
                    "contextRef":  "FD2017Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "hil:ReversalofAllocatedSharebasedCompensationExpense",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "",
                "isDefault":  "false",
                "longName":  "Uncategorized Items - hil-12312019x10k.htm",
                "role":  "http://xbrl.sec.gov/role/uncategorizedFacts",
                "shortName":  "Uncategorized Items - hil-12312019x10k.htm",
                "subGroupType":  "",
                "uniqueAnchor":  null
                }
            },
        "segmentCount":  109,
        "tag":  {
            "country_AE":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "UNITED ARAB EMIRATES",
                            "terseLabel":  "United Arab Emirates"
                            }
                        }
                    },
                "localname":  "AE",
                "nsuri":  "http://xbrl.sec.gov/country/2017-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "country_US":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "UNITED STATES",
                            "verboseLabel":  "United States"
                            }
                        }
                    },
                "localname":  "US",
                "nsuri":  "http://xbrl.sec.gov/country/2017-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "dei_AmendmentFlag":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.",
                            "label":  "Amendment Flag",
                            "terseLabel":  "Amendment Flag"
                            }
                        }
                    },
                "localname":  "AmendmentFlag",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_CityAreaCode":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Area code of city",
                            "label":  "City Area Code",
                            "terseLabel":  "City Area Code"
                            }
                        }
                    },
                "localname":  "CityAreaCode",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_CoverAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Cover page.",
                            "label":  "Cover page."
                            }
                        }
                    },
                "localname":  "CoverAbstract",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "dei_CurrentFiscalYearEndDate":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "End date of current fiscal year in the format --MM-DD.",
                            "label":  "Current Fiscal Year End Date",
                            "terseLabel":  "Current Fiscal Year End Date"
                            }
                        }
                    },
                "localname":  "CurrentFiscalYearEndDate",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "gMonthDayItemType"
                },
            "dei_DocumentAnnualReport":  {
                "auth_ref":  [
                    "r525"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true only for a form used as an annual report.",
                            "label":  "Document Annual Report",
                            "terseLabel":  "Document Annual Report"
                            }
                        }
                    },
                "localname":  "DocumentAnnualReport",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_DocumentFiscalPeriodFocus":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fiscal period values are FY, Q1, Q2, and Q3.  1st, 2nd and 3rd quarter 10-Q or 10-QT statements have value Q1, Q2, and Q3 respectively, with 10-K, 10-KT or other fiscal year statements having FY.",
                            "label":  "Document Fiscal Period Focus",
                            "terseLabel":  "Document Fiscal Period Focus (i.e.  Q1,Q2,Q3,FY)"
                            }
                        }
                    },
                "localname":  "DocumentFiscalPeriodFocus",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "fiscalPeriodItemType"
                },
            "dei_DocumentFiscalYearFocus":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "This is focus fiscal year of the document report in CCYY format.  For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus.  Example: 2006.",
                            "label":  "Document Fiscal Year Focus",
                            "terseLabel":  "Document Fiscal Year Focus"
                            }
                        }
                    },
                "localname":  "DocumentFiscalYearFocus",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "gYearItemType"
                },
            "dei_DocumentPeriodEndDate":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The end date of the period reflected on the cover page if a periodic report.  For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date.  The format of the date is CCYY-MM-DD.",
                            "label":  "Document Period End Date",
                            "terseLabel":  "Document Period End Date"
                            }
                        }
                    },
                "localname":  "DocumentPeriodEndDate",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "dateItemType"
                },
            "dei_DocumentTransitionReport":  {
                "auth_ref":  [
                    "r524"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true only for a form used as a transition report.",
                            "label":  "Document Transition Report",
                            "terseLabel":  "Document Transition Report"
                            }
                        }
                    },
                "localname":  "DocumentTransitionReport",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_DocumentType":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc).  The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.",
                            "label":  "Document Type",
                            "terseLabel":  "Document Type"
                            }
                        }
                    },
                "localname":  "DocumentType",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "submissionTypeItemType"
                },
            "dei_DocumentsIncorporatedByReferenceTextBlock":  {
                "auth_ref":  [
                    "r522"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Documents incorporated by reference.",
                            "label":  "Documents Incorporated by Reference [Text Block]",
                            "terseLabel":  "Documents Incorporated by Reference"
                            }
                        }
                    },
                "localname":  "DocumentsIncorporatedByReferenceTextBlock",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "dei_EntityAddressAddressLine1":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Address Line 1 such as Attn, Building Name, Street Name",
                            "label":  "Entity Address, Address Line One",
                            "terseLabel":  "Entity Address, Address Line One"
                            }
                        }
                    },
                "localname":  "EntityAddressAddressLine1",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityAddressAddressLine2":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Address Line 2 such as Street or Suite number",
                            "label":  "Entity Address, Address Line Two",
                            "terseLabel":  "Entity Address, Address Line Two"
                            }
                        }
                    },
                "localname":  "EntityAddressAddressLine2",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityAddressCityOrTown":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Name of the City or Town",
                            "label":  "Entity Address, City or Town",
                            "terseLabel":  "Entity Address, City or Town"
                            }
                        }
                    },
                "localname":  "EntityAddressCityOrTown",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityAddressPostalZipCode":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Code for the postal or zip code",
                            "label":  "Entity Address, Postal Zip Code",
                            "terseLabel":  "Entity Address, Postal Zip Code"
                            }
                        }
                    },
                "localname":  "EntityAddressPostalZipCode",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityAddressStateOrProvince":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Name of the state or province.",
                            "label":  "Entity Address, State or Province",
                            "terseLabel":  "Entity Address, State or Province"
                            }
                        }
                    },
                "localname":  "EntityAddressStateOrProvince",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "stateOrProvinceItemType"
                },
            "dei_EntityCentralIndexKey":  {
                "auth_ref":  [
                    "r526"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC.  It is commonly abbreviated as CIK.",
                            "label":  "Entity Central Index Key",
                            "terseLabel":  "Entity Central Index Key"
                            }
                        }
                    },
                "localname":  "EntityCentralIndexKey",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "centralIndexKeyItemType"
                },
            "dei_EntityCommonStockSharesOutstanding":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Indicate number of shares or other units outstanding of each of registrant's classes of capital or common stock or other ownership interests, if and as stated on cover of related periodic report.  Where multiple classes or units exist define each class/interest by adding class of stock items such as Common Class A [Member], Common Class B [Member] or Partnership Interest [Member] onto the Instrument [Domain] of the Entity Listings, Instrument.",
                            "label":  "Entity Common Stock, Shares Outstanding",
                            "terseLabel":  "Entity Common Stock, Shares Outstanding"
                            }
                        }
                    },
                "localname":  "EntityCommonStockSharesOutstanding",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "dei_EntityCurrentReportingStatus":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Indicate 'Yes' or 'No' whether registrants (1) have filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that registrants were required to file such reports), and (2) have been subject to such filing requirements for the past 90 days.  This information should be based on the registrant's current or most recent filing containing the related disclosure.",
                            "label":  "Entity Current Reporting Status",
                            "terseLabel":  "Entity Current Reporting Status"
                            }
                        }
                    },
                "localname":  "EntityCurrentReportingStatus",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_EntityDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "All the names of the entities being reported upon in a document.  Any legal structure used to conduct activities or to hold assets.  Some examples of such structures are corporations, partnerships, limited liability companies, grantor trusts, and other trusts.  This item does not include business and geographical segments which are included in the geographical or business segments domains.",
                            "label":  "Entity [Domain]",
                            "terseLabel":  "Entity [Domain]"
                            }
                        }
                    },
                "localname":  "EntityDomain",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "dei_EntityEmergingGrowthCompany":  {
                "auth_ref":  [
                    "r526"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Indicate if registrant meets the emerging growth company criteria.",
                            "label":  "Entity Emerging Growth Company",
                            "terseLabel":  "Entity Emerging Growth Company"
                            }
                        }
                    },
                "localname":  "EntityEmergingGrowthCompany",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntityFileNumber":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Commission file number.  The field allows up to 17 characters.  The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.",
                            "label":  "Entity File Number",
                            "terseLabel":  "Entity File Number"
                            }
                        }
                    },
                "localname":  "EntityFileNumber",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "fileNumberItemType"
                },
            "dei_EntityFilerCategory":  {
                "auth_ref":  [
                    "r526"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Indicate whether the registrant is one of the following:  Large Accelerated Filer, Accelerated Filer, Non-accelerated Filer.  Definitions of these categories are stated in Rule 12b-2 of the Exchange Act.  This information should be based on the registrant's current or most recent filing containing the related disclosure.",
                            "label":  "Entity Filer Category",
                            "terseLabel":  "Entity Filer Category"
                            }
                        }
                    },
                "localname":  "EntityFilerCategory",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "filerCategoryItemType"
                },
            "dei_EntityIncorporationStateCountryCode":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Two-character EDGAR code representing the state or country of incorporation.",
                            "label":  "Entity Incorporation, State or Country Code",
                            "terseLabel":  "Entity Incorporation, State or Country Code"
                            }
                        }
                    },
                "localname":  "EntityIncorporationStateCountryCode",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "edgarStateCountryItemType"
                },
            "dei_EntityInteractiveDataCurrent":  {
                "auth_ref":  [
                    "r527"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true when the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).",
                            "label":  "Entity Interactive Data Current",
                            "terseLabel":  "Entity Interactive Data Current"
                            }
                        }
                    },
                "localname":  "EntityInteractiveDataCurrent",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_EntityNumberOfEmployees":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of persons employed by the Entity",
                            "label":  "Entity Number of Employees",
                            "terseLabel":  "Number of professionals"
                            }
                        }
                    },
                "localname":  "EntityNumberOfEmployees",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "decimalItemType"
                },
            "dei_EntityPublicFloat":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter.",
                            "label":  "Entity Public Float",
                            "terseLabel":  "Entity Public Float"
                            }
                        }
                    },
                "localname":  "EntityPublicFloat",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "dei_EntityRegistrantName":  {
                "auth_ref":  [
                    "r526"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.",
                            "label":  "Entity Registrant Name",
                            "terseLabel":  "Entity Registrant Name"
                            }
                        }
                    },
                "localname":  "EntityRegistrantName",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityShellCompany":  {
                "auth_ref":  [
                    "r526"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Boolean flag that is true when the registrant is a shell company as defined in Rule 12b-2 of the Exchange Act.",
                            "label":  "Entity Shell Company",
                            "terseLabel":  "Entity Shell Company"
                            }
                        }
                    },
                "localname":  "EntityShellCompany",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntitySmallBusiness":  {
                "auth_ref":  [
                    "r526"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Indicates that the company is a Smaller Reporting Company (SRC).",
                            "label":  "Entity Small Business",
                            "terseLabel":  "Entity Small Business"
                            }
                        }
                    },
                "localname":  "EntitySmallBusiness",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntityTaxIdentificationNumber":  {
                "auth_ref":  [
                    "r526"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.",
                            "label":  "Entity Tax Identification Number",
                            "terseLabel":  "Entity Tax Identification Number"
                            }
                        }
                    },
                "localname":  "EntityTaxIdentificationNumber",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "employerIdItemType"
                },
            "dei_EntityVoluntaryFilers":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Indicate 'Yes' or 'No' if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.",
                            "label":  "Entity Voluntary Filers",
                            "terseLabel":  "Entity Voluntary Filers"
                            }
                        }
                    },
                "localname":  "EntityVoluntaryFilers",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_EntityWellKnownSeasonedIssuer":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Indicate 'Yes' or 'No' if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.  Is used on Form Type: 10-K, 10-Q, 8-K, 20-F, 6-K, 10-K/A, 10-Q/A, 20-F/A, 6-K/A, N-CSR, N-Q, N-1A.",
                            "label":  "Entity Well-known Seasoned Issuer",
                            "terseLabel":  "Entity Well-known Seasoned Issuer"
                            }
                        }
                    },
                "localname":  "EntityWellKnownSeasonedIssuer",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_LegalEntityAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The set of legal entities associated with a report.",
                            "label":  "Legal Entity [Axis]",
                            "terseLabel":  "Legal Entity [Axis]"
                            }
                        }
                    },
                "localname":  "LegalEntityAxis",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "dei_LocalPhoneNumber":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Local phone number for entity.",
                            "label":  "Local Phone Number",
                            "terseLabel":  "Local Phone Number"
                            }
                        }
                    },
                "localname":  "LocalPhoneNumber",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_Security12bTitle":  {
                "auth_ref":  [
                    "r521"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Title of a 12(b) registered security.",
                            "label":  "Title of 12(b) Security",
                            "terseLabel":  "Title of 12(b) Security"
                            }
                        }
                    },
                "localname":  "Security12bTitle",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "securityTitleItemType"
                },
            "dei_SecurityExchangeName":  {
                "auth_ref":  [
                    "r523"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Name of the Exchange on which a security is registered.",
                            "label":  "Security Exchange Name",
                            "terseLabel":  "Security Exchange Name"
                            }
                        }
                    },
                "localname":  "SecurityExchangeName",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "edgarExchangeCodeItemType"
                },
            "dei_TradingSymbol":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Trading symbol of an instrument as listed on an exchange.",
                            "label":  "Trading Symbol",
                            "terseLabel":  "Trading Symbol"
                            }
                        }
                    },
                "localname":  "TradingSymbol",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CoverPage"
                    ],
                "xbrltype":  "tradingSymbolItemType"
                },
            "hil_A2008EmplyeeStockPurchasePlanMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "2008 Emplyee Stock Purchase Plan [Member]",
                            "label":  "2008 Emplyee Stock Purchase Plan [Member]",
                            "terseLabel":  "Common stock issued under the 2008 Employee Stock Purchase Plan"
                            }
                        }
                    },
                "localname":  "A2008EmplyeeStockPurchasePlanMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_AccountsReceivableAllowanceforCreditLossAdditions":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accounts Receivable, Allowance for Credit Loss, Additions",
                            "label":  "Accounts Receivable, Allowance for Credit Loss, Additions",
                            "terseLabel":  "Additions to allowance for uncollectible receivables"
                            }
                        }
                    },
                "localname":  "AccountsReceivableAllowanceforCreditLossAdditions",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableAllowanceForDoubtfulAccountsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_AccountsReceivableAllowanceforCreditLossOther":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accounts Receivable, Allowance for Credit Loss, Other",
                            "label":  "Accounts Receivable, Allowance for Credit Loss, Other",
                            "negatedTerseLabel":  "Other"
                            }
                        }
                    },
                "localname":  "AccountsReceivableAllowanceforCreditLossOther",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableAllowanceForDoubtfulAccountsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_AccruedAgencyFees":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accrued agency fees.",
                            "label":  "Accrued Agency Fees",
                            "terseLabel":  "Accrued agency fees"
                            }
                        }
                    },
                "localname":  "AccruedAgencyFees",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_AccruedAgencyFeesandOtherAccruedLiabilitiesCurrent":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accrued Agency Fees and Other Accrued Liabilities, Current",
                            "label":  "Accrued Agency Fees and Other Accrued Liabilities, Current",
                            "negatedLabel":  "Reversal of agency fees and other accrued expenses"
                            }
                        }
                    },
                "localname":  "AccruedAgencyFeesandOtherAccruedLiabilitiesCurrent",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_AccruedSubcontractorFees":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accrued subcontractor fees.",
                            "label":  "Accrued Subcontractor Fees",
                            "terseLabel":  "Accrued subcontractor fees"
                            }
                        }
                    },
                "localname":  "AccruedSubcontractorFees",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_AdjustmentstoAdditionalPaidinCapitalIncreaseDecreaseRelatedtoPutOptions":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Adjustments to Additional Paid in Capital, Increase (Decrease) Related to Put Options",
                            "label":  "Adjustments to Additional Paid in Capital, Increase (Decrease) Related to Put Options",
                            "terseLabel":  "Reversal of accrual for portion of ESA put option"
                            }
                        }
                    },
                "localname":  "AdjustmentstoAdditionalPaidinCapitalIncreaseDecreaseRelatedtoPutOptions",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_AmountofGrantReceived":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of Grant Received",
                            "label":  "Amount of Grant Received",
                            "terseLabel":  "Amount of grant received"
                            }
                        }
                    },
                "localname":  "AmountofGrantReceived",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesOtherIncomeNetDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_BidBondsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Bid Bonds [Member]",
                            "label":  "Bid Bonds [Member]",
                            "terseLabel":  "Bid Bonds"
                            }
                        }
                    },
                "localname":  "BidBondsMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_BusinessAcquisitionLiabilityToPurchaseSharesAccruedOnExercisePutOptions":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the carrying value of liability to purchase shares accrued on exercise of put options.",
                            "label":  "Business Acquisition Liability to Purchase Shares Accrued on Exercise Put Options",
                            "terseLabel":  "Value of put option"
                            }
                        }
                    },
                "localname":  "BusinessAcquisitionLiabilityToPurchaseSharesAccruedOnExercisePutOptions",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_CashCollateralForIssuanceOfPerformanceAndAdvancePaymentBondsAndLettersOfCredit":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the cash held in restricted accounts as collateral for the issuance of performance and advance payment bonds and letters of credit.",
                            "label":  "Cash Collateral for Issuance of Performance and Advance Payment Bonds and Letters of Credit",
                            "terseLabel":  "Cash held as collateral for the issuance of performance and advance payment bonds and letters of credit"
                            }
                        }
                    },
                "localname":  "CashCollateralForIssuanceOfPerformanceAndAdvancePaymentBondsAndLettersOfCredit",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_ComputerEquipmentAndSoftwareMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to computer equipment and software applications.",
                            "label":  "Computer Equipment And Software [Member]",
                            "terseLabel":  "Computer equipment and software"
                            }
                        }
                    },
                "localname":  "ComputerEquipmentAndSoftwareMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ConcessiaCarteraYGestionDeInfrastructurasSAMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to Concessia, Cartera y Gestion de Infrastructuras, S.A.",
                            "label":  "Concessia Cartera Y Gestion De Infrastructuras S A [Member]",
                            "terseLabel":  "Concessia, Cartera y Gestion de Infrastructuras S.A."
                            }
                        }
                    },
                "localname":  "ConcessiaCarteraYGestionDeInfrastructurasSAMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesInvestmentsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ConsultingFeeRevenueandIncomeDerivedFromReimbursableCostsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Consulting Fee Revenue and Income Derived From Reimbursable Costs [Member]",
                            "label":  "Consulting Fee Revenue and Income Derived From Reimbursable Costs [Member]",
                            "terseLabel":  "Consulting Fee Revenue and Income Derived From Reimbursable Costs"
                            }
                        }
                    },
                "localname":  "ConsultingFeeRevenueandIncomeDerivedFromReimbursableCostsMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesReclassificationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ConsultingFeesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Consulting Fees [Member]",
                            "label":  "Consulting Fees [Member]",
                            "terseLabel":  "Consulting fee revenue"
                            }
                        }
                    },
                "localname":  "ConsultingFeesMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ContractPayableRetainage":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount due to vendors that is withheld pursuant to retainage provisions in the contract, which will be paid after one year.",
                            "label":  "Contract Payable Retainage",
                            "terseLabel":  "Retainage payable"
                            }
                        }
                    },
                "localname":  "ContractPayableRetainage",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_ContractReceivableRetainagePolicyTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract.",
                            "label":  "Contract Receivable Retainage [Policy Text Block]",
                            "terseLabel":  "Retainage Receivable"
                            }
                        }
                    },
                "localname":  "ContractReceivableRetainagePolicyTextBlock",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "hil_CurrentMaturitiesofNotesPayableandLongTermDebt":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Current Maturities of Notes Payable and Long-Term Debt",
                            "label":  "Current Maturities of Notes Payable and Long-Term Debt",
                            "terseLabel":  "Current maturities of notes payable and long-term debt"
                            }
                        }
                    },
                "localname":  "CurrentMaturitiesofNotesPayableandLongTermDebt",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_DebtCovenantLeverageRatioLimit":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the consolidated net leverage ratio (as defined in the debt instrument) which the reporting entity must not exceed in order to be in compliance with the debt covenants of the credit facility.",
                            "label":  "Debt Covenant Leverage Ratio Limit",
                            "terseLabel":  "Debt covenant leverage ratio limit"
                            }
                        }
                    },
                "localname":  "DebtCovenantLeverageRatioLimit",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "pureItemType"
                },
            "hil_DebtInstrumentIncreaseInApplicableInterestRateUponDefault":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the percentage increase in applicable interest rate upon default under debt instrument.",
                            "label":  "Debt Instrument Increase in Applicable Interest Rate Upon Default",
                            "terseLabel":  "Increase in applicable interest rate upon default (as a percent)"
                            }
                        }
                    },
                "localname":  "DebtInstrumentIncreaseInApplicableInterestRateUponDefault",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "hil_DebtInstrumentUnamortizedDiscountPremiumandDebtIssuanceCostsNetCurrent":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LongTermDebtCurrent",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, Current",
                            "label":  "Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, Current",
                            "negatedTerseLabel":  "Current portion of unamortized debt discount and deferred financing costs"
                            }
                        }
                    },
                "localname":  "DebtInstrumentUnamortizedDiscountPremiumandDebtIssuanceCostsNetCurrent",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_DebtInstrumentVariableRateBaseEURIBORMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the Euro Interbank Offered Rate (EURIBOR) used to calculate the variable interest rate of the debt instrument.",
                            "label":  "Debt Instrument Variable Rate Base E U R I B O R [Member]",
                            "terseLabel":  "EURIBOR"
                            }
                        }
                    },
                "localname":  "DebtInstrumentVariableRateBaseEURIBORMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_DecreaseinRevolvingCreditFacilities":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Decrease in Revolving Credit Facilities",
                            "label":  "Decrease in Revolving Credit Facilities",
                            "terseLabel":  "Decrease in revolving credit facilities"
                            }
                        }
                    },
                "localname":  "DecreaseinRevolvingCreditFacilities",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_DeferredIncomeTaxProvisionBenefit":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash flow impact for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities.",
                            "label":  "Deferred Income Tax Provision Benefit",
                            "terseLabel":  "Deferred tax benefit"
                            }
                        }
                    },
                "localname":  "DeferredIncomeTaxProvisionBenefit",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_DeferredStockUnitsDSUsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Deferred Stock Units (DSUs) [Member]",
                            "label":  "Deferred Stock Units (DSUs) [Member]",
                            "terseLabel":  "DSUs",
                            "verboseLabel":  "Deferred stock units"
                            }
                        }
                    },
                "localname":  "DeferredStockUnitsDSUsMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_DeferredTaxLiabilitiesChangeInTaxMethod":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_DeferredIncomeTaxLiabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the amount of deferred tax liability attributable to taxable temporary differences from change in tax method.",
                            "label":  "Deferred Tax Liabilities Change in Tax Method",
                            "negatedLabel":  "Change in tax method"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilitiesChangeInTaxMethod",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfEmployeeTurnover":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average annual rate of employee turnover, used to determine benefit obligation of defined benefit plan.  Plan includes, but is not limited to, pay-related defined benefit plan.",
                            "label":  "Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Rate Of Employee Turnover",
                            "terseLabel":  "Assumed annual employee turnover (as a percent)"
                            }
                        }
                    },
                "localname":  "DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfEmployeeTurnover",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "hil_DefinedContributionPlanEligibilityCriteriaMinimumAgeOfEmployees":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the minimum age of an employee for participation in the defined contribution plan of the entity.",
                            "label":  "Defined Contribution Plan Eligibility Criteria Minimum Age of Employees",
                            "terseLabel":  "Eligibility criteria, minimum age"
                            }
                        }
                    },
                "localname":  "DefinedContributionPlanEligibilityCriteriaMinimumAgeOfEmployees",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "hil_DefinedContributionPlanEligibilityCriteriaMinimumTermofService":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Defined Contribution Plan, Eligibility Criteria Minimum Term of Service",
                            "label":  "Defined Contribution Plan, Eligibility Criteria Minimum Term of Service",
                            "terseLabel":  "Eligibility criteria, minimum term of service"
                            }
                        }
                    },
                "localname":  "DefinedContributionPlanEligibilityCriteriaMinimumTermofService",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "hil_DepreciationDepletionAndAmortizationExcludingAmortizationOfLoanFees":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.  Excludes amortization of loan fees.",
                            "label":  "Depreciation Depletion And Amortization Excluding Amortization Of Loan Fees",
                            "terseLabel":  "Depreciation and amortization",
                            "verboseLabel":  "Depreciation and amortization expense"
                            }
                        }
                    },
                "localname":  "DepreciationDepletionAndAmortizationExcludingAmortizationOfLoanFees",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationDepreciationAndAmortizationExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_EffectiveIncomeTaxRateReconciliationForeignCurrencyTranslationAdjustmentsAmount":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  8.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Effective Income Tax Rate Reconciliation, Foreign Currency Translation Adjustments, Amount",
                            "label":  "Effective Income Tax Rate Reconciliation, Foreign Currency Translation Adjustments, Amount",
                            "terseLabel":  "Foreign currency translation adjustments"
                            }
                        }
                    },
                "localname":  "EffectiveIncomeTaxRateReconciliationForeignCurrencyTranslationAdjustmentsAmount",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  10.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Effective Income Tax Rate Reconciliation, Global Intangible Low-Taxed Income, Amount",
                            "label":  "Effective Income Tax Rate Reconciliation, Global Intangible Low-Taxed Income, Amount",
                            "terseLabel":  "Global intangible low-taxed income"
                            }
                        }
                    },
                "localname":  "EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLossonBond":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  11.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Effective Income Tax Rate Reconciliation, Nondeductible Expense, Loss on Bond",
                            "label":  "Effective Income Tax Rate Reconciliation, Nondeductible Expense, Loss on Bond",
                            "terseLabel":  "Non-deductible loss on bond"
                            }
                        }
                    },
                "localname":  "EffectiveIncomeTaxRateReconciliationNondeductibleExpenseLossonBond",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_EffectiveIncomeTaxRateReconciliationReversalofLiability":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  12.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Effective Income Tax Rate Reconciliation, Reversal of Liability",
                            "label":  "Effective Income Tax Rate Reconciliation, Reversal of Liability",
                            "terseLabel":  "Reversal of Construction Claims Group liability"
                            }
                        }
                    },
                "localname":  "EffectiveIncomeTaxRateReconciliationReversalofLiability",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_EngineeringSAMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to Engineering S.A.",
                            "label":  "Engineering S A [Member]",
                            "terseLabel":  "Engineering S A"
                            }
                        }
                    },
                "localname":  "EngineeringSAMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_EngineeringSAServicesTechnicosConsortiumofBrazilianCreditFacilitiesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Engineering SA Services Technicos - Consortium of Brazilian Credit Facilities [Member]",
                            "label":  "Engineering SA Services Technicos - Consortium of Brazilian Credit Facilities [Member]",
                            "terseLabel":  "Engineering SA Services Technicos - Consortium of Brazilian Credit Facilities"
                            }
                        }
                    },
                "localname":  "EngineeringSAServicesTechnicosConsortiumofBrazilianCreditFacilitiesMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_EquityLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "[Line Items] for Equity [Table]",
                            "label":  "Equity [Line Items]",
                            "terseLabel":  "Equity [Line Items]"
                            }
                        }
                    },
                "localname":  "EquityLineItems",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "hil_EquitySecuritieswithoutReadilyDeterminableFairValueOwnershipPercentage":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Equity Securities without Readily Determinable Fair Value, Ownership Percentage",
                            "label":  "Equity Securities without Readily Determinable Fair Value, Ownership Percentage",
                            "terseLabel":  "Ownership interest"
                            }
                        }
                    },
                "localname":  "EquitySecuritieswithoutReadilyDeterminableFairValueOwnershipPercentage",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesInvestmentsDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "hil_EquityTable":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Equity [Table]",
                            "label":  "Equity [Table]",
                            "terseLabel":  "Equity [Table]"
                            }
                        }
                    },
                "localname":  "EquityTable",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "hil_EuroDenominatedFacilityMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to Euro-denominated facility.",
                            "label":  "Euro Denominated Facility [Member]",
                            "terseLabel":  "International Revolver"
                            }
                        }
                    },
                "localname":  "EuroDenominatedFacilityMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ExercisePrice10Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exercise Price 10",
                            "label":  "Exercise Price 10 [Member]",
                            "terseLabel":  "$4.90"
                            }
                        }
                    },
                "localname":  "ExercisePrice10Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ExercisePrice11Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exercise Price 11",
                            "label":  "Exercise Price 11 [Member]",
                            "terseLabel":  "$4.95"
                            }
                        }
                    },
                "localname":  "ExercisePrice11Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ExercisePrice12Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exercise Price 12",
                            "label":  "Exercise Price 12 [Member]",
                            "terseLabel":  "$5.17"
                            }
                        }
                    },
                "localname":  "ExercisePrice12Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ExercisePrice1Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exercise Price 1",
                            "label":  "Exercise Price 1 [Member]",
                            "terseLabel":  "$3.12"
                            }
                        }
                    },
                "localname":  "ExercisePrice1Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ExercisePrice2Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exercise Price 2",
                            "label":  "Exercise Price 2 [Member]",
                            "terseLabel":  "$3.13"
                            }
                        }
                    },
                "localname":  "ExercisePrice2Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ExercisePrice3Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exercise Price 3",
                            "label":  "Exercise Price 3 [Member]",
                            "terseLabel":  "$3.67"
                            }
                        }
                    },
                "localname":  "ExercisePrice3Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ExercisePrice4Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exercise Price 4",
                            "label":  "Exercise Price 4 [Member]",
                            "terseLabel":  "$4.00"
                            }
                        }
                    },
                "localname":  "ExercisePrice4Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ExercisePrice5Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exercise Price 5",
                            "label":  "Exercise Price 5 [Member]",
                            "terseLabel":  "$4.03"
                            }
                        }
                    },
                "localname":  "ExercisePrice5Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ExercisePrice6Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exercise Price 6",
                            "label":  "Exercise Price 6 [Member]",
                            "terseLabel":  "$4.31"
                            }
                        }
                    },
                "localname":  "ExercisePrice6Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ExercisePrice7Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exercise Price 7",
                            "label":  "Exercise Price 7 [Member]",
                            "terseLabel":  "$4.46"
                            }
                        }
                    },
                "localname":  "ExercisePrice7Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ExercisePrice8Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exercise Price 8",
                            "label":  "Exercise Price 8 [Member]",
                            "terseLabel":  "$4.65"
                            }
                        }
                    },
                "localname":  "ExercisePrice8Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ExercisePrice9Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Exercise Price 9",
                            "label":  "Exercise Price 9 [Member]",
                            "terseLabel":  "$4.84"
                            }
                        }
                    },
                "localname":  "ExercisePrice9Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ForeignCreditAgreementsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to foreign credit agreements entered into by the entity.",
                            "label":  "Foreign Credit Agreements [Member]",
                            "terseLabel":  "Foreign credit agreements"
                            }
                        }
                    },
                "localname":  "ForeignCreditAgreementsMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ForeignGovernmentMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Foreign government.",
                            "label":  "Foreign Government [Member]",
                            "terseLabel":  "Foreign governments"
                            }
                        }
                    },
                "localname":  "ForeignGovernmentMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_GrantLiability":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Grant Liability",
                            "label":  "Grant Liability",
                            "terseLabel":  "Grant liability"
                            }
                        }
                    },
                "localname":  "GrantLiability",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesOtherIncomeNetDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_HillInternationalInc.FirstAbuDhabiBankPJSCOverdraftCreditFacilityMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Hill International, Inc. - First Abu Dhabi Bank PJSC Overdraft Credit Facility",
                            "label":  "Hill International, Inc. - First Abu Dhabi Bank PJSC Overdraft Credit Facility [Member]",
                            "terseLabel":  "Hill International, Inc. - First Abu Dhabi Bank PJSC Overdraft Credit Facility"
                            }
                        }
                    },
                "localname":  "HillInternationalInc.FirstAbuDhabiBankPJSCOverdraftCreditFacilityMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_HillInternationalInc.SocitGnrale2017TermLoanFacilityMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Hill International, Inc. - Soci\u00e9t\u00e9 G\u00e9n\u00e9rale 2017 Term Loan Facility [Member]",
                            "label":  "Hill International, Inc. - Soci\u00e9t\u00e9 G\u00e9n\u00e9rale 2017 Term Loan Facility [Member]",
                            "terseLabel":  "Hill International, Inc. - Soci\u00e9t\u00e9 G\u00e9n\u00e9rale 2017 Term Loan Facility"
                            }
                        }
                    },
                "localname":  "HillInternationalInc.SocitGnrale2017TermLoanFacilityMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_HillInternationalInc.SocitGnraleDomesticRevolvingCreditFacilityMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Hill International, Inc. - Soci\u00e9t\u00e9 G\u00e9n\u00e9rale Domestic Revolving Credit Facility [Member]",
                            "label":  "Hill International, Inc. - Soci\u00e9t\u00e9 G\u00e9n\u00e9rale Domestic Revolving Credit Facility [Member]",
                            "terseLabel":  "Hill International, Inc. - Soci\u00e9t\u00e9 G\u00e9n\u00e9rale Domestic Revolving Credit Facility"
                            }
                        }
                    },
                "localname":  "HillInternationalInc.SocitGnraleDomesticRevolvingCreditFacilityMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_HillInternationalN.V..SocitGnraleInternationalRevolvingCreditFacilityMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Hill International N.V.. - Soci\u00e9t\u00e9 G\u00e9n\u00e9rale International Revolving Credit Facility [Member]",
                            "label":  "Hill International N.V.. - Soci\u00e9t\u00e9 G\u00e9n\u00e9rale International Revolving Credit Facility [Member]",
                            "terseLabel":  "Hill International N.V. - Soci\u00e9t\u00e9 G\u00e9n\u00e9rale International Revolving Credit Facility"
                            }
                        }
                    },
                "localname":  "HillInternationalN.V..SocitGnraleInternationalRevolvingCreditFacilityMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_HillInternationalSpainSABankiaS.A.andBankinterS.AMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Hill International Spain SA - Bankia, S.A. and Bankinter, S.A [Member]",
                            "label":  "Hill International Spain SA - Bankia, S.A. and Bankinter, S.A [Member]",
                            "terseLabel":  "Hill International Spain SA - Bankia, S.A. and Bankinter, S.A"
                            }
                        }
                    },
                "localname":  "HillInternationalSpainSABankiaS.A.andBankinterS.AMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_HillInternationalSpainSAIberCajaBancoS.A.Member":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Hill International Spain SA - IberCaja Banco, S.A. [Member]",
                            "label":  "Hill International Spain SA - IberCaja Banco, S.A. [Member]",
                            "terseLabel":  "Hill International Spain SA - IberCaja Banco, S.A."
                            }
                        }
                    },
                "localname":  "HillInternationalSpainSAIberCajaBancoS.A.Member",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_HillInternationalSpainSAMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to Hill International (Spain), S.A. a subsidiary of the entity.",
                            "label":  "Hill International Spain S A [Member]",
                            "terseLabel":  "Hill International Spain S A"
                            }
                        }
                    },
                "localname":  "HillInternationalSpainSAMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_IncomeLossFromDiscontinuedOperationsBeforeGainLossofDiscontinuedOperationNetofTax":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Income Loss From Discontinued Operations Before Gain (Loss) of Discontinued Operation, Net of Tax",
                            "label":  "Income Loss From Discontinued Operations Before Gain (Loss) of Discontinued Operation, Net of Tax",
                            "negatedLabel":  "Loss from discontinued operations",
                            "terseLabel":  "Loss from discontinued operations"
                            }
                        }
                    },
                "localname":  "IncomeLossFromDiscontinuedOperationsBeforeGainLossofDiscontinuedOperationNetofTax",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesReclassificationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_IncomeTaxExaminationPeriodForExaminingTaxReturns":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the period for examining income tax returns due to utilizing prior years net operating losses in subsequent year's tax returns.",
                            "label":  "Income Tax Examination Period for Examining Tax Returns",
                            "terseLabel":  "Period for examination of tax returns for prior years net operating losses utilized in subsequent years's tax returns"
                            }
                        }
                    },
                "localname":  "IncomeTaxExaminationPeriodForExaminingTaxReturns",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "hil_IncomeTaxReconciliationExcessCompensation":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the portion of the difference between total income tax expense (benefit) as reported in the income statement and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to excess compensation.",
                            "label":  "Income Tax Reconciliation Excess Compensation",
                            "terseLabel":  "Excess compensation"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationExcessCompensation",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_IncomeTaxesAdditionalDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "",
                            "label":  "Income Taxes Additional Disclosure [Abstract]",
                            "terseLabel":  "Additional disclosures"
                            }
                        }
                    },
                "localname":  "IncomeTaxesAdditionalDisclosureAbstract",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "hil_IncreaseDecreaseinOperatingLeaseLiability":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  18.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Increase (Decrease) in Operating Lease Liability",
                            "label":  "Increase (Decrease) in Operating Lease Liability",
                            "terseLabel":  "Operating lease liabilities"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseinOperatingLeaseLiability",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_IncreaseDecreaseinRightofUseOperatingLeaseAsset":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Increase (Decrease) in Right-of-Use Operating Lease Asset",
                            "label":  "Increase (Decrease) in Right-of-Use Operating Lease Asset",
                            "negatedTerseLabel":  "Operating lease right-of use assets"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseinRightofUseOperatingLeaseAsset",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_IncreaseInAdditionalPaidInCapitalAndTreasuryStockFromCashlessExerciseOfStockOptions":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Increase in additional paid in capital and treasury stock from cashless exercise of stock options",
                            "label":  "Increase in Additional Paid in Capital and Treasury Stock from Cashless Exercise of Stock Options",
                            "terseLabel":  "Increase in additional paid-in capital from issuance of shares of common stock from cashless exercise of stock options"
                            }
                        }
                    },
                "localname":  "IncreaseInAdditionalPaidInCapitalAndTreasuryStockFromCashlessExerciseOfStockOptions",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_InterestAndRelatedFinancingFees":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Interest and related financing fees paid.",
                            "label":  "Interest and Related Financing Fees",
                            "terseLabel":  "Interest and related financing fees paid"
                            }
                        }
                    },
                "localname":  "InterestAndRelatedFinancingFees",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_InterimChiefExecutiveOfficerMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Highest ranking executive officer (Temporary), who has ultimate managerial responsibility for the entity and who reports to the board of directors.  In addition, the chief executive officer (CEO) may also be the chairman of the board or president.",
                            "label":  "Interim Chief Executive Officer [Member]",
                            "terseLabel":  "Interim Chief Executive Officer"
                            }
                        }
                    },
                "localname":  "InterimChiefExecutiveOfficerMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_LettersofGuaranteeMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Letters of Guarantee [Member]",
                            "label":  "Letters of Guarantee [Member]",
                            "terseLabel":  "Letters of Guarantee"
                            }
                        }
                    },
                "localname":  "LettersofGuaranteeMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_LiquidityAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Liquidity [Abstract]",
                            "label":  "Liquidity [Abstract]"
                            }
                        }
                    },
                "localname":  "LiquidityAbstract",
                "nsuri":  "http://www.hillintl.com/20191231",
                "xbrltype":  "stringItemType"
                },
            "hil_LiquidityLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "[Line Items] for Liquidity [Table]",
                            "label":  "Liquidity [Line Items]",
                            "terseLabel":  "Liquidity [Line Items]"
                            }
                        }
                    },
                "localname":  "LiquidityLineItems",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "hil_LiquidityRelatedToCollectionsDisclosureTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of the recoverability of certain asset amounts and management's actions to alleviate liquidity issues.  Disclosure of the principal conditions and events that are causing liquidity issues.  Disclose whether operations for the current or prior years generated sufficient cash to cover current obligations, whether waivers were obtained from creditors relating to the company's default under the provisions of debt agreements and possible effects of such conditions and events, such as: whether there is a possible need to obtain additional financing (debt or equity) or to liquidate certain holdings to offset future cash flow deficiencies.",
                            "label":  "Liquidity Related To Collections Disclosure [Text Block]",
                            "terseLabel":  "Liquidity"
                            }
                        }
                    },
                "localname":  "LiquidityRelatedToCollectionsDisclosureTextBlock",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/Liquidity"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "hil_LiquidityTable":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Liquidity [Table]",
                            "label":  "Liquidity [Table]",
                            "terseLabel":  "Liquidity [Table]"
                            }
                        }
                    },
                "localname":  "LiquidityTable",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "hil_LongtermDebtMaturities":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Long-term Debt, Maturities",
                            "label":  "Long-term Debt, Maturities",
                            "totalLabel":  "Total"
                            }
                        }
                    },
                "localname":  "LongtermDebtMaturities",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_MandatoryPrepaymentofDebtPercentageofExcessCashFlowForEachFiscalYearCommencingWithFirstFullFiscalYearUponAchievementofCertainMetrics":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Mandatory Prepayment of Debt, Percentage of Excess Cash Flow For Each Fiscal Year Commencing With First Full Fiscal Year Upon Achievement of Certain Metrics",
                            "label":  "Mandatory Prepayment of Debt, Percentage of Excess Cash Flow For Each Fiscal Year Commencing With First Full Fiscal Year Upon Achievement of Certain Metrics",
                            "terseLabel":  "Mandatory prepayment percentage of the excess cash flow for each fiscal year with the first full fiscal year upon the achievement and maintenance of certain metrics"
                            }
                        }
                    },
                "localname":  "MandatoryPrepaymentofDebtPercentageofExcessCashFlowForEachFiscalYearCommencingWithFirstFullFiscalYearUponAchievementofCertainMetrics",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "hil_MandatoryPrepaymentofDebtPercentageofExcessCashFlowForEachFiscalYearCommencingWithFirstFullFiscalYearUponAchievementofCertainMetricsTwo":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Mandatory Prepayment of Debt, Percentage of Excess Cash Flow For Each Fiscal Year Commencing With First Full Fiscal Year Upon Achievement of Certain Metrics Two",
                            "label":  "Mandatory Prepayment of Debt, Percentage of Excess Cash Flow For Each Fiscal Year Commencing With First Full Fiscal Year Upon Achievement of Certain Metrics Two",
                            "terseLabel":  "Mandatory prepayment percentage of the excess cash flow for each fiscal year with the first full fiscal year upon the achievement net leverage ration is equal to or less than 2.25"
                            }
                        }
                    },
                "localname":  "MandatoryPrepaymentofDebtPercentageofExcessCashFlowForEachFiscalYearCommencingWithFirstFullFiscalYearUponAchievementofCertainMetricsTwo",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "hil_MinimumCompletionPeriodOfProject":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the minimum completion period of the project.",
                            "label":  "Minimum Completion Period of Project",
                            "terseLabel":  "Minimum completion period of the project"
                            }
                        }
                    },
                "localname":  "MinimumCompletionPeriodOfProject",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "hil_NumberOfCustomers":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the number of major customers.",
                            "label":  "Number of Customers",
                            "verboseLabel":  "Number of 10% clients"
                            }
                        }
                    },
                "localname":  "NumberOfCustomers",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "hil_NumberOfMinorityShareholdersWhoExercisedPutOption":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the number of minority shareholders who exercised Put Option.",
                            "label":  "Number of Minority Shareholders who Exercised Put Option",
                            "terseLabel":  "Number of minority shareholders exercising put option"
                            }
                        }
                    },
                "localname":  "NumberOfMinorityShareholdersWhoExercisedPutOption",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "hil_NumberofOffices":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of Offices",
                            "label":  "Number of Offices",
                            "terseLabel":  "Number of offices (more than)"
                            }
                        }
                    },
                "localname":  "NumberofOffices",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/CompanyDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "hil_NumberofProfessionals":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of Professionals",
                            "label":  "Number of Professionals",
                            "terseLabel":  "Number of professionals"
                            }
                        }
                    },
                "localname":  "NumberofProfessionals",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/CompanyDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "hil_OffBalanceSheetArrangementsAverageTerm":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Off-Balance Sheet Arrangements, Average Term",
                            "label":  "Off-Balance Sheet Arrangements, Average Term",
                            "terseLabel":  "Arrangement average term"
                            }
                        }
                    },
                "localname":  "OffBalanceSheetArrangementsAverageTerm",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "hil_OffBalanceSheetArrangementsMaximumPotentialFuturePayment":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the maximum potential amount payable in future under the off-balance sheet arrangements.",
                            "label":  "Off Balance Sheet Arrangements Maximum Potential Future Payment",
                            "terseLabel":  "Maximum potential future payment under off-balance sheet arrangements"
                            }
                        }
                    },
                "localname":  "OffBalanceSheetArrangementsMaximumPotentialFuturePayment",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_OfficersMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information pertaining to certain officers member.",
                            "label":  "Officers [Member]",
                            "terseLabel":  "Officers"
                            }
                        }
                    },
                "localname":  "OfficersMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_OtherForeignBanksMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to other foreign banks.",
                            "label":  "Other Foreign Banks [Member]",
                            "terseLabel":  "Other Foreign Banks"
                            }
                        }
                    },
                "localname":  "OtherForeignBanksMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_PaymentsMadeBySubsidiariesToAcquireAdditionalInterest":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the cash outflow associated with the purchase of noncontrolling interest by subsidiaries during the period.",
                            "label":  "Payments Made by Subsidiaries to Acquire Additional Interest",
                            "negatedLabel":  "Purchase of additional interest in ESA"
                            }
                        }
                    },
                "localname":  "PaymentsMadeBySubsidiariesToAcquireAdditionalInterest",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_PaymentsforPenalty":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Payments for Penalty",
                            "label":  "Payments for Penalty",
                            "terseLabel":  "Payments for penalty"
                            }
                        }
                    },
                "localname":  "PaymentsforPenalty",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SubsequentEventDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_PercentageOfEligibleReceivablesThatAreNotSubjectToPerfectedSecurityInterestUsedInCalculationOfBorrowingBase":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage Of Eligible Receivables That Are Not Subject To Perfected Security Interest Used In Calculation Of Borrowing Base",
                            "label":  "Percentage Of Eligible Receivables That Are Not Subject To Perfected Security Interest Used In Calculation Of Borrowing Base",
                            "terseLabel":  "Percentage of eligible receivables that are not subject to a perfected security interest which are used in calculation of borrowing base"
                            }
                        }
                    },
                "localname":  "PercentageOfEligibleReceivablesThatAreNotSubjectToPerfectedSecurityInterestUsedInCalculationOfBorrowingBase",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "hil_PercentageOfEligibleReceivablesThatAreSubjectToPerfectedSecurityInterestUsedinCalculationOfBorrowingBase":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage Of Eligible Receivables That Are Subject To Perfected Security Interest Used in Calculation Of Borrowing Base",
                            "label":  "Percentage Of Eligible Receivables That Are Subject To Perfected Security Interest Used in Calculation Of Borrowing Base",
                            "terseLabel":  "Percentage of eligible receivables that are subject to a perfected security interest which are used in calculation of borrowing base"
                            }
                        }
                    },
                "localname":  "PercentageOfEligibleReceivablesThatAreSubjectToPerfectedSecurityInterestUsedinCalculationOfBorrowingBase",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "hil_PercentageofReceivables":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage of Receivables",
                            "label":  "Percentage of Receivables",
                            "terseLabel":  "Percentage of aggregate amount of Eligible Domestic Receivables as of the immediately preceding calendar month"
                            }
                        }
                    },
                "localname":  "PercentageofReceivables",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "hil_PercentofDifferenceBetweenReceivablesandReserve":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percent of Difference Between Receivables and Reserve",
                            "label":  "Percent of Difference Between Receivables and Reserve",
                            "terseLabel":  "Percent of difference between aggregate amount of Eligible Domestic Receivables and Dilution Reserve"
                            }
                        }
                    },
                "localname":  "PercentofDifferenceBetweenReceivablesandReserve",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "hil_PhiladelphiaIndustrialDevelopmentCorporationMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to Philadelphia Industrial Development Corporation.",
                            "label":  "Philadelphia Industrial Development Corporation [Member]",
                            "terseLabel":  "Philadelphia Industrial Development Corporation Loan"
                            }
                        }
                    },
                "localname":  "PhiladelphiaIndustrialDevelopmentCorporationMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_PotentialTaxLiabilityRelatingToForeignSubsidiaries":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of loss contingency pertaining to the the potential tax liability relating to certain foreign subsidiaries failure to comply with laws and regulations that was charged against earnings in the period, including the effects of revisions in previously reported estimates.",
                            "label":  "Potential Tax Liability Relating to Foreign Subsidiaries",
                            "terseLabel":  "Potential tax liability related to certain foreign subsidiaries"
                            }
                        }
                    },
                "localname":  "PotentialTaxLiabilityRelatingToForeignSubsidiaries",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_PremiumFinancingAgreementwithAFCOPremiumCreditLLCMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Premium Financing Agreement with AFCO Premium Credit LLC [Member]",
                            "label":  "Premium Financing Agreement with AFCO Premium Credit LLC [Member]",
                            "terseLabel":  "Premium Financing Agreement with AFCO Premium Credit LLC"
                            }
                        }
                    },
                "localname":  "PremiumFinancingAgreementwithAFCOPremiumCreditLLCMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_PrivateSectorMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Private sector.",
                            "label":  "Private Sector [Member]",
                            "terseLabel":  "Private sector"
                            }
                        }
                    },
                "localname":  "PrivateSectorMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ProceedsfromEmployeeStockPurchasePlan":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Proceeds from Employee Stock Purchase Plan",
                            "label":  "Proceeds from Employee Stock Purchase Plan",
                            "negatedLabel":  "Proceeds from employee stock purchase plan excluded"
                            }
                        }
                    },
                "localname":  "ProceedsfromEmployeeStockPurchasePlan",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_ProceedsfromIssuanceofMediumtermNotesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Proceeds from Issuance of Medium-term Notes [Member]",
                            "label":  "Proceeds from Issuance of Medium-term Notes [Member]",
                            "terseLabel":  "Proceeds from Issuance of Medium-term Notes"
                            }
                        }
                    },
                "localname":  "ProceedsfromIssuanceofMediumtermNotesMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesReclassificationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ProjectManagementMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Project management.",
                            "label":  "Project Management [Member]",
                            "terseLabel":  "Project Management"
                            }
                        }
                    },
                "localname":  "ProjectManagementMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationDepreciationAndAmortizationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_RampedMetroJointVentureMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to Ramped Metro Joint Venture.",
                            "label":  "Ramped Metro Joint Venture [Member]",
                            "terseLabel":  "RAMPED Metro Joint Venture"
                            }
                        }
                    },
                "localname":  "RampedMetroJointVentureMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesInvestmentsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ReimbursableExpensesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Reimbursable Expenses [Member]",
                            "label":  "Reimbursable Expenses [Member]",
                            "terseLabel":  "Reimbursable expenses"
                            }
                        }
                    },
                "localname":  "ReimbursableExpensesMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_RepaymentsofLinesofCreditMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Repayments of Lines of Credit [Member]",
                            "label":  "Repayments of Lines of Credit [Member]",
                            "terseLabel":  "Repayments of Lines of Credit"
                            }
                        }
                    },
                "localname":  "RepaymentsofLinesofCreditMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesReclassificationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ReversalofAllocatedSharebasedCompensationExpense":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Reversal of Allocated Share-based Compensation Expense",
                            "label":  "Reversal of Allocated Share-based Compensation Expense",
                            "terseLabel":  "Reversal of stock-based compensation expense previously recognized"
                            }
                        }
                    },
                "localname":  "ReversalofAllocatedSharebasedCompensationExpense",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_ScheduleOfAdvertisingCostsTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of advertising costs during the period that are expensed as incurred.",
                            "label":  "Schedule of Advertising Costs [Table Text Block]",
                            "terseLabel":  "Schedule of advertising costs that are expensed as incurred"
                            }
                        }
                    },
                "localname":  "ScheduleOfAdvertisingCostsTableTextBlock",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "hil_ScheduleOfDepreciationExpenseTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of information with respect to depreciation expense.",
                            "label":  "Schedule of Depreciation Expense [Table Text Block]",
                            "terseLabel":  "Schedule of information with respect to depreciation expense"
                            }
                        }
                    },
                "localname":  "ScheduleOfDepreciationExpenseTableTextBlock",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "hil_ScheduleOfPropertyPlantAndEquipmentUsefulLifeTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the useful life of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.",
                            "label":  "Schedule of Property Plant and Equipment Useful Life [Table Text Block]",
                            "terseLabel":  "Schedule of estimated useful lives of the assets"
                            }
                        }
                    },
                "localname":  "ScheduleOfPropertyPlantAndEquipmentUsefulLifeTableTextBlock",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "hil_ScheduleOfRevenueFromClientTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule of revenue from client.",
                            "label":  "Schedule of Revenue from Client [Table Text Block]",
                            "terseLabel":  "Schedule of Revenue By Client Type"
                            }
                        }
                    },
                "localname":  "ScheduleOfRevenueFromClientTableTextBlock",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "hil_SecuredCreditFacilitiesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to Secured Credit Facilities.",
                            "label":  "Secured Credit Facilities [Member]",
                            "terseLabel":  "Secured Credit Facilities"
                            }
                        }
                    },
                "localname":  "SecuredCreditFacilitiesMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_SecuredTermLoanMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Collateralized debt obligation secured by a second lien on the reporting entity's assets.",
                            "label":  "Secured Term Loan [Member]",
                            "terseLabel":  "Term loan payable"
                            }
                        }
                    },
                "localname":  "SecuredTermLoanMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsForfeitureRange":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the forfeiture range, which is used as an assumption to estimate the fair value of options granted during the period.",
                            "label":  "Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Forfeiture Range",
                            "terseLabel":  "Forfeiture range (as a percent)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsForfeitureRange",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAssumptionsUsedDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "hil_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageForfeitureRate":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the weighted average forfeiture rate, which is used as an assumption to estimate the fair value of options granted during the period.",
                            "label":  "Share Based Compensation Arrangement by Share Based Payment Award, Fair Value Assumptions, Weighted Average Forfeiture Rate",
                            "terseLabel":  "Weighted average forfeiture rate (as a percent)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageForfeitureRate",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAssumptionsUsedDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "hil_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedAggregateFairValue":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the aggregate fair value of options granted.",
                            "label":  "Share Based Compensation Arrangement by Share Based Payment Award Options Granted Aggregate Fair Value",
                            "terseLabel":  "Options granted, aggregate fair value"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedAggregateFairValue",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_ShareBasedCompensationArrangementbyShareBasedPaymentAwardNumberofCommonStockIssuablePerEachAward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The number of common shares issuable per each deferred stock unit under the Non-Employee Director Stock Grant Plan.",
                            "label":  "Share Based Compensation Arrangement by Share Based Payment Award Number of Common Stock Issuable Per Each Award",
                            "terseLabel":  "Number of common stock shares issuable for each award (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementbyShareBasedPaymentAwardNumberofCommonStockIssuablePerEachAward",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "hil_ShareBasedCompensationArrangementbySharebasedPaymentAwardAwardsSubjecttoPerformanceLevelRangesPercent":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Share Based Compensation Arrangement by Share-based Payment Award, Awards Subject to Performance-Level Ranges, Percent",
                            "label":  "Share Based Compensation Arrangement by Share-based Payment Award, Awards Subject to Performance-Level Ranges, Percent",
                            "terseLabel":  "Awards subject to performance-level ranges (as a percent of RSUs granted)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementbySharebasedPaymentAwardAwardsSubjecttoPerformanceLevelRangesPercent",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "hil_SharebasedPaymentArrangementExcludingEmployeeStockOptionsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Share-based Payment Arrangement, Excluding Employee Stock Options [Member]",
                            "label":  "Share-based Payment Arrangement, Excluding Employee Stock Options [Member]",
                            "terseLabel":  "Share-based Payment Arrangement, Excluding Employee Stock Options"
                            }
                        }
                    },
                "localname":  "SharebasedPaymentArrangementExcludingEmployeeStockOptionsMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_ShorttermandVariableLeaseCost":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Short-term and Variable Lease, Cost",
                            "label":  "Short-term and Variable Lease, Cost",
                            "terseLabel":  "Leases with initial term of 12 months or less"
                            }
                        }
                    },
                "localname":  "ShorttermandVariableLeaseCost",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_SingleCustomerInLibyaMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Single Customer In Libya [Member]",
                            "label":  "Single Customer In Libya [Member]",
                            "terseLabel":  "Single Customer In Libya"
                            }
                        }
                    },
                "localname":  "SingleCustomerInLibyaMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_StockIssuedDuringPeriodSharesStockOptionsCashlessExercised":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of share options (or share units) cashless exercised during the current period.",
                            "label":  "Stock Issued During Period Shares Stock Options Cashless Exercised",
                            "terseLabel":  "Cashless exercise of stock options (in shares)"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodSharesStockOptionsCashlessExercised",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity",
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "hil_StockIssuedDuringPeriodSharesStockOptionsExercisedOnCashlessBasis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of share options (or share units) exercised on cashless basis during the current period.",
                            "label":  "Stock Issued During Period Shares Stock Options Exercised on Cashless Basis",
                            "verboseLabel":  "Options exercised (in shares)"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodSharesStockOptionsExercisedOnCashlessBasis",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "hil_StockIssuedDuringPeriodValueStockOptionsCashlessExercised":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Value stock issued during the period as a result of the cashless exercise of stock options.",
                            "label":  "Stock Issued During Period Value Stock Options Cashless Exercised",
                            "terseLabel":  "Cashless exercise of stock options"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodValueStockOptionsCashlessExercised",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "hil_TheUnitedStatesOfAmericaAndCanadaMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to The United States of America and Canada.",
                            "label":  "The United States Of America And Canada [Member]",
                            "terseLabel":  "United States",
                            "verboseLabel":  "United States/Canada"
                            }
                        }
                    },
                "localname":  "TheUnitedStatesOfAmericaAndCanadaMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationPropertyPlantAndEquipmentNetByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_USDollarDenominatedFacilityMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents information pertaining to U.S. dollar-denominated facility.",
                            "label":  "U S Dollar Denominated Facility [Member]",
                            "terseLabel":  "U.S.  Revolver"
                            }
                        }
                    },
                "localname":  "USDollarDenominatedFacilityMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_UnvestedSharebasedCompensationUnitsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Unvested Share-based Compensation Units [Member]",
                            "label":  "Unvested Share-based Compensation Units [Member]",
                            "terseLabel":  "Unvested share-based compensation units"
                            }
                        }
                    },
                "localname":  "UnvestedSharebasedCompensationUnitsMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_UsFederalGovernmentMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "US federal government.",
                            "label":  "Us Federal Government [Member]",
                            "terseLabel":  "U.S. federal government"
                            }
                        }
                    },
                "localname":  "UsFederalGovernmentMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "hil_UsStateLocalAndRegionalGovernmentMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "U S state local and regional government.",
                            "label":  "Us State Local And Regional Government [Member]",
                            "terseLabel":  "U.S. state, regional and local governments"
                            }
                        }
                    },
                "localname":  "UsStateLocalAndRegionalGovernmentMember",
                "nsuri":  "http://www.hillintl.com/20191231",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_AffiliatedEntityMember":  {
                "auth_ref":  [
                    "r297",
                    "r449",
                    "r451",
                    "r520",
                    "r529"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "An affiliate is a party that, directly or indirectly through one or more intermediaries, controls, is controlled by, or is under common control with the entity.",
                            "label":  "Affiliated Entity [Member]",
                            "terseLabel":  "Affiliated Entity"
                            }
                        }
                    },
                "localname":  "AffiliatedEntityMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_AfricaMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Continent of Africa.",
                            "label":  "Africa [Member]",
                            "terseLabel":  "Africa"
                            }
                        }
                    },
                "localname":  "AfricaMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationPropertyPlantAndEquipmentNetByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_AsiaPacificMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Region of Asia Pacific.",
                            "label":  "Asia Pacific [Member]",
                            "terseLabel":  "Asia/Pacific"
                            }
                        }
                    },
                "localname":  "AsiaPacificMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationPropertyPlantAndEquipmentNetByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ConsolidationItemsAxis":  {
                "auth_ref":  [
                    "r160",
                    "r169"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by components, eliminations, non-segment corporate-level activity and reconciling items used in consolidating a parent entity and its subsidiaries or its operating segments.",
                            "label":  "Consolidation Items [Axis]",
                            "terseLabel":  "Consolidation Items [Axis]"
                            }
                        }
                    },
                "localname":  "ConsolidationItemsAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationDepreciationAndAmortizationExpenseDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_ConsolidationItemsDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Components, elimination, non-segment corporate-level activity and reconciling items used in consolidating a parent entity and its subsidiaries or its operating segments.",
                            "label":  "Consolidation Items [Domain]",
                            "terseLabel":  "Consolidation Items [Domain]"
                            }
                        }
                    },
                "localname":  "ConsolidationItemsDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationDepreciationAndAmortizationExpenseDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_EuropeMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Continent of Europe.",
                            "label":  "Europe [Member]",
                            "terseLabel":  "Europe"
                            }
                        }
                    },
                "localname":  "EuropeMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationPropertyPlantAndEquipmentNetByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_LatinAmericaMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Region of Latin America.",
                            "label":  "Latin America [Member]",
                            "terseLabel":  "Latin America"
                            }
                        }
                    },
                "localname":  "LatinAmericaMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationPropertyPlantAndEquipmentNetByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_MajorCustomersAxis":  {
                "auth_ref":  [
                    "r176",
                    "r282",
                    "r287",
                    "r513"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by name or description of a single external customer or a group of external customers.",
                            "label":  "Customer [Axis]",
                            "terseLabel":  "Customer [Axis]"
                            }
                        }
                    },
                "localname":  "MajorCustomersAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_MaximumMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Upper limit of the provided range.",
                            "label":  "Maximum [Member]",
                            "terseLabel":  "Maximum"
                            }
                        }
                    },
                "localname":  "MaximumMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails",
                    "http://www.hillintl.com/role/OperatingLeasesDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAndGoodwillDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_MinimumMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Lower limit of the provided range.",
                            "label":  "Minimum [Member]",
                            "terseLabel":  "Minimum"
                            }
                        }
                    },
                "localname":  "MinimumMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAndGoodwillDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_NameOfMajorCustomerDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Single external customer or group of external customers.",
                            "label":  "Customer [Domain]",
                            "terseLabel":  "Customer [Domain]"
                            }
                        }
                    },
                "localname":  "NameOfMajorCustomerDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ProductOrServiceAxis":  {
                "auth_ref":  [
                    "r172",
                    "r282",
                    "r285",
                    "r510",
                    "r511"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by product and service, or group of similar products and similar services.",
                            "label":  "Product and Service [Axis]",
                            "terseLabel":  "Product and Service [Axis]"
                            }
                        }
                    },
                "localname":  "ProductOrServiceAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_ProductsAndServicesDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Product or service, or a group of similar products or similar services.",
                            "label":  "Product and Service [Domain]",
                            "terseLabel":  "Product and Service [Domain]"
                            }
                        }
                    },
                "localname":  "ProductsAndServicesDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_RangeAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by statistical measurement.  Includes, but is not limited to, minimum, maximum, weighted average, arithmetic average, and median.",
                            "label":  "Statistical Measurement [Axis]",
                            "terseLabel":  "Statistical Measurement [Axis]"
                            }
                        }
                    },
                "localname":  "RangeAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails",
                    "http://www.hillintl.com/role/OperatingLeasesDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAndGoodwillDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_RangeMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Statistical measurement.  Includes, but is not limited to, minimum, maximum, weighted average, arithmetic average, and median.",
                            "label":  "Statistical Measurement [Domain]",
                            "terseLabel":  "Statistical Measurement [Domain]"
                            }
                        }
                    },
                "localname":  "RangeMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails",
                    "http://www.hillintl.com/role/OperatingLeasesDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAndGoodwillDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock":  {
                "auth_ref":  [
                    "r126",
                    "r531"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for valuation and qualifying accounts and reserves.",
                            "label":  "SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]",
                            "terseLabel":  "Schedule II Valuation and Qualifying Accounts"
                            }
                        }
                    },
                "localname":  "ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccounts"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "srt_SegmentGeographicalDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Geographical area.",
                            "label":  "Geographical [Domain]",
                            "terseLabel":  "Geographical [Domain]"
                            }
                        }
                    },
                "localname":  "SegmentGeographicalDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationPropertyPlantAndEquipmentNetByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_StatementGeographicalAxis":  {
                "auth_ref":  [
                    "r175",
                    "r282",
                    "r286",
                    "r512",
                    "r516",
                    "r519",
                    "r528",
                    "r530"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by geographical components.",
                            "label":  "Geographical [Axis]",
                            "terseLabel":  "Geographical [Axis]"
                            }
                        }
                    },
                "localname":  "StatementGeographicalAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationPropertyPlantAndEquipmentNetByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_TitleOfIndividualAxis":  {
                "auth_ref":  [
                    "r178",
                    "r450"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by title of individual or nature of relationship to individual or group of individuals.",
                            "label":  "Title of Individual [Axis]",
                            "terseLabel":  "Title of Individual [Axis]"
                            }
                        }
                    },
                "localname":  "TitleOfIndividualAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_TitleOfIndividualWithRelationshipToEntityDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Title of individual, or nature of relationship to individual or group of individuals.",
                            "label":  "Title of Individual [Domain]",
                            "terseLabel":  "Title of Individual [Domain]"
                            }
                        }
                    },
                "localname":  "TitleOfIndividualWithRelationshipToEntityDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ValuationAndQualifyingAccountsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]"
                            }
                        }
                    },
                "localname":  "ValuationAndQualifyingAccountsAbstract",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "srt_ValuationAndQualifyingAccountsDisclosureLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]",
                            "terseLabel":  "SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]"
                            }
                        }
                    },
                "localname":  "ValuationAndQualifyingAccountsDisclosureLineItems",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesValuationAllowanceForDeferredTaxAssetDetails",
                    "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccountsAllowanceForUncollectibleReceivablesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_ValuationAndQualifyingAccountsDisclosureTable":  {
                "auth_ref":  [
                    "r126",
                    "r531"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of valuation and qualifying accounts and reserves.",
                            "label":  "SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table]",
                            "terseLabel":  "SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Table]"
                            }
                        }
                    },
                "localname":  "ValuationAndQualifyingAccountsDisclosureTable",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesValuationAllowanceForDeferredTaxAssetDetails",
                    "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccountsAllowanceForUncollectibleReceivablesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AccountingPoliciesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Accounting Policies [Abstract]"
                            }
                        }
                    },
                "localname":  "AccountingPoliciesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AccountingStandardsUpdate201602Member":  {
                "auth_ref":  [
                    "r434"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accounting Standards Update 2016-02 Leases (Topic 842).",
                            "label":  "Accounting Standards Update 2016-02 [Member]",
                            "terseLabel":  "Accounting Standards Update 2016-02"
                            }
                        }
                    },
                "localname":  "AccountingStandardsUpdate201602Member",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesAccountingPronouncementsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AccountsNotesAndLoansReceivableLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Accounts, Notes, Loans and Financing Receivable [Line Items]",
                            "terseLabel":  "Accounts, Notes, Loans and Financing Receivable [Line Items]"
                            }
                        }
                    },
                "localname":  "AccountsNotesAndLoansReceivableLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent":  {
                "auth_ref":  [
                    "r49"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.",
                            "label":  "Accounts Payable and Accrued Liabilities, Current",
                            "terseLabel":  "Accounts payable and accrued expenses",
                            "totalLabel":  "Accounts payable and accrued expenses, net"
                            }
                        }
                    },
                "localname":  "AccountsPayableAndAccruedLiabilitiesCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails",
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Accounts Payable and Accrued Liabilities, Current [Abstract]",
                            "terseLabel":  "Components of accounts payable and accrued expenses"
                            }
                        }
                    },
                "localname":  "AccountsPayableAndAccruedLiabilitiesCurrentAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock":  {
                "auth_ref":  [
                    "r47"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for accounts payable and accrued liabilities at the end of the reporting period.",
                            "label":  "Accounts Payable and Accrued Liabilities Disclosure [Text Block]",
                            "terseLabel":  "Accounts Payable and Accrued Expenses"
                            }
                        }
                    },
                "localname":  "AccountsPayableAndAccruedLiabilitiesDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpenses"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_AccountsPayableCurrent":  {
                "auth_ref":  [
                    "r46"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.  Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
                            "label":  "Accounts Payable, Current",
                            "terseLabel":  "Accounts payable"
                            }
                        }
                    },
                "localname":  "AccountsPayableCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccountsReceivableGrossCurrent":  {
                "auth_ref":  [
                    "r179",
                    "r180"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_AccountsReceivableNetCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.",
                            "label":  "Accounts Receivable, before Allowance for Credit Loss, Current",
                            "totalLabel":  "Accounts receivable, gross"
                            }
                        }
                    },
                "localname":  "AccountsReceivableGrossCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccountsReceivableMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Due from customers or clients for goods or services that have been delivered or sold.",
                            "label":  "Accounts Receivable [Member]",
                            "terseLabel":  "Accounts receivable"
                            }
                        }
                    },
                "localname":  "AccountsReceivableMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AccountsReceivableNetCurrent":  {
                "auth_ref":  [
                    "r12",
                    "r31",
                    "r179",
                    "r180",
                    "r283"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_AssetsCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.",
                            "label":  "Accounts Receivable, after Allowance for Credit Loss, Current",
                            "totalLabel":  "Accounts Receivable - Affiliates, net",
                            "verboseLabel":  "Accounts receivable, net"
                            }
                        }
                    },
                "localname":  "AccountsReceivableNetCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails",
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccruedProfessionalFeesCurrent":  {
                "auth_ref":  [
                    "r17",
                    "r18",
                    "r51"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received.  Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
                            "label":  "Accrued Professional Fees, Current",
                            "terseLabel":  "Accrued legal and professional fees"
                            }
                        }
                    },
                "localname":  "AccruedProfessionalFeesCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccruedSalariesCurrent":  {
                "auth_ref":  [
                    "r17",
                    "r18",
                    "r51"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided.  Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
                            "label":  "Accrued Salaries, Current",
                            "terseLabel":  "Accrued payroll and related expenses"
                            }
                        }
                    },
                "localname":  "AccruedSalariesCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment":  {
                "auth_ref":  [
                    "r44",
                    "r237"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_PropertyPlantAndEquipmentNet",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.",
                            "label":  "Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment",
                            "negatedLabel":  "Less accumulated depreciation and amortization"
                            }
                        }
                    },
                "localname":  "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax":  {
                "auth_ref":  [
                    "r68",
                    "r69",
                    "r70"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end.  Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners.  Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.",
                            "label":  "Accumulated Other Comprehensive Income (Loss), Net of Tax",
                            "terseLabel":  "Accumulated other comprehensive loss"
                            }
                        }
                    },
                "localname":  "AccumulatedOtherComprehensiveIncomeLossNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccumulatedOtherComprehensiveIncomeMember":  {
                "auth_ref":  [
                    "r67",
                    "r70",
                    "r71",
                    "r410"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accumulated increase (decrease) in equity from transactions and other events and circumstances from non-owner sources, attributable to the parent.  Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners.",
                            "label":  "AOCI Attributable to Parent [Member]",
                            "terseLabel":  "Accumulated Other Comprehensive (Loss)"
                            }
                        }
                    },
                "localname":  "AccumulatedOtherComprehensiveIncomeMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AdditionalCashFlowElementsAndSupplementalCashFlowInformationAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]",
                            "terseLabel":  "Supplemental disclosures of cash flow information:"
                            }
                        }
                    },
                "localname":  "AdditionalCashFlowElementsAndSupplementalCashFlowInformationAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AdditionalPaidInCapital":  {
                "auth_ref":  [
                    "r32"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders.  Includes adjustments to additional paid in capital.  Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees.  Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock.  For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock.  For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.",
                            "label":  "Additional Paid in Capital",
                            "terseLabel":  "Additional paid-in capital"
                            }
                        }
                    },
                "localname":  "AdditionalPaidInCapital",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AdditionalPaidInCapitalMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders.",
                            "label":  "Additional Paid-in Capital [Member]",
                            "terseLabel":  "Additional Paid-in Capital"
                            }
                        }
                    },
                "localname":  "AdditionalPaidInCapitalMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AdjustmentsForNewAccountingPronouncementsAxis":  {
                "auth_ref":  [
                    "r128"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by new accounting pronouncement.",
                            "label":  "Adjustments for New Accounting Pronouncements [Axis]",
                            "terseLabel":  "Adjustments for New Accounting Pronouncements [Axis]"
                            }
                        }
                    },
                "localname":  "AdjustmentsForNewAccountingPronouncementsAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesAccountingPronouncementsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue":  {
                "auth_ref":  [
                    "r302",
                    "r304",
                    "r343",
                    "r344"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.",
                            "label":  "APIC, Share-based Payment Arrangement, Increase for Cost Recognition",
                            "terseLabel":  "Share-based compensation expense"
                            }
                        }
                    },
                "localname":  "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]",
                            "terseLabel":  "Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:"
                            }
                        }
                    },
                "localname":  "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AdvertisingCostsPolicyTextBlock":  {
                "auth_ref":  [
                    "r346"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for advertising cost.",
                            "label":  "Advertising Cost [Policy Text Block]",
                            "terseLabel":  "Advertising Costs"
                            }
                        }
                    },
                "localname":  "AdvertisingCostsPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_AdvertisingExpense":  {
                "auth_ref":  [
                    "r347"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.",
                            "label":  "Advertising Expense",
                            "terseLabel":  "Advertising costs"
                            }
                        }
                    },
                "localname":  "AdvertisingExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesGeneralPoliciesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AllocatedShareBasedCompensationExpense":  {
                "auth_ref":  [
                    "r304",
                    "r337",
                    "r342"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of expense for award under share-based payment arrangement.  Excludes amount capitalized.",
                            "label":  "Share-based Payment Arrangement, Expense",
                            "terseLabel":  "Compensation expense",
                            "verboseLabel":  "Compensation expense"
                            }
                        }
                    },
                "localname":  "AllocatedShareBasedCompensationExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AllowanceForCreditLossMember":  {
                "auth_ref":  [
                    "r125"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Allowance for credit loss from right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.",
                            "label":  "SEC Schedule, 12-09, Allowance, Credit Loss [Member]",
                            "terseLabel":  "SEC Schedule, 12-09, Allowance, Credit Loss"
                            }
                        }
                    },
                "localname":  "AllowanceForCreditLossMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccountsAllowanceForUncollectibleReceivablesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock":  {
                "auth_ref":  [
                    "r183",
                    "r204"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of allowance for credit loss on financing receivable.",
                            "label":  "Financing Receivable, Allowance for Credit Loss [Table Text Block]",
                            "terseLabel":  "Activity in allowance for doubtful accounts"
                            }
                        }
                    },
                "localname":  "AllowanceForCreditLossesOnFinancingReceivablesTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_AllowanceForDoubtfulAccountsReceivable":  {
                "auth_ref":  [
                    "r186",
                    "r197",
                    "r199",
                    "r203"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of allowance for credit loss on accounts receivable.",
                            "label":  "Accounts Receivable, Allowance for Credit Loss",
                            "negatedPeriodEndLabel":  "Allowance for doubtful accounts at December 31, 2019",
                            "negatedPeriodStartLabel":  "Allowance for doubtful accounts at December 31, 2018"
                            }
                        }
                    },
                "localname":  "AllowanceForDoubtfulAccountsReceivable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableAllowanceForDoubtfulAccountsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent":  {
                "auth_ref":  [
                    "r37",
                    "r186",
                    "r197"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_AccountsReceivableNetCurrent",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of allowance for credit loss on accounts receivable, classified as current.",
                            "label":  "Accounts Receivable, Allowance for Credit Loss, Current",
                            "negatedLabel":  "Allowance for doubtful accounts"
                            }
                        }
                    },
                "localname":  "AllowanceForDoubtfulAccountsReceivableCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries":  {
                "auth_ref":  [
                    "r202"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase in allowance for credit loss on accounts receivable, from recovery.",
                            "label":  "Accounts Receivable, Allowance for Credit Loss, Recovery",
                            "terseLabel":  "Bad debt recoveries",
                            "verboseLabel":  "Recoveries of previously reserved receivables"
                            }
                        }
                    },
                "localname":  "AllowanceForDoubtfulAccountsReceivableRecoveries",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableAllowanceForDoubtfulAccountsDetails",
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Accounts Receivable, Allowance for Credit Loss [Roll Forward]",
                            "terseLabel":  "Accounts Receivable, Allowance for Credit Loss [Roll Forward]"
                            }
                        }
                    },
                "localname":  "AllowanceForDoubtfulAccountsReceivableRollforward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableAllowanceForDoubtfulAccountsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs":  {
                "auth_ref":  [
                    "r201"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of direct write-downs of accounts receivable charged against the allowance.",
                            "label":  "Accounts Receivable, Allowance for Credit Loss, Writeoff",
                            "terseLabel":  "Write-off of receivables"
                            }
                        }
                    },
                "localname":  "AllowanceForDoubtfulAccountsReceivableWriteOffs",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableAllowanceForDoubtfulAccountsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AmortizationOfFinancingCosts":  {
                "auth_ref":  [
                    "r88",
                    "r105",
                    "r428"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of amortization expense attributable to debt issuance costs.",
                            "label":  "Amortization of Debt Issuance Costs",
                            "verboseLabel":  "Amortization of deferred loan fees"
                            }
                        }
                    },
                "localname":  "AmortizationOfFinancingCosts",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AmortizationOfIntangibleAssets":  {
                "auth_ref":  [
                    "r105",
                    "r224",
                    "r230"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets.  As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.",
                            "label":  "Amortization of Intangible Assets",
                            "terseLabel":  "Amortization expense related to intangible assets"
                            }
                        }
                    },
                "localname":  "AmortizationOfIntangibleAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsEstimatedAmortizationExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount":  {
                "auth_ref":  [
                    "r138"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.",
                            "label":  "Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount",
                            "verboseLabel":  "Anti-dilutive securities that were not included in the calculation of common shares outstanding (in shares)"
                            }
                        }
                    },
                "localname":  "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesGeneralPoliciesDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis":  {
                "auth_ref":  [
                    "r138"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of antidilutive security.",
                            "label":  "Antidilutive Securities [Axis]",
                            "terseLabel":  "Antidilutive Securities [Axis]"
                            }
                        }
                    },
                "localname":  "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]",
                            "terseLabel":  "Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]"
                            }
                        }
                    },
                "localname":  "AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AntidilutiveSecuritiesNameDomain":  {
                "auth_ref":  [
                    "r138"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Incremental common shares attributable to securities that were not included in diluted earnings per share (EPS) because to do so would increase EPS amounts or decrease loss per share amounts for the period presented.",
                            "label":  "Antidilutive Securities, Name [Domain]",
                            "terseLabel":  "Antidilutive Securities, Name [Domain]"
                            }
                        }
                    },
                "localname":  "AntidilutiveSecuritiesNameDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_Assets":  {
                "auth_ref":  [
                    "r163",
                    "r475",
                    "r496"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Sum of the carrying amounts as of the balance sheet date of all assets that are recognized.  Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
                            "label":  "Assets",
                            "totalLabel":  "Total assets"
                            }
                        }
                    },
                "localname":  "Assets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AssetsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Assets [Abstract]",
                            "terseLabel":  "Assets"
                            }
                        }
                    },
                "localname":  "AssetsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AssetsCurrent":  {
                "auth_ref":  [
                    "r13",
                    "r14",
                    "r65"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer).  Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.",
                            "label":  "Assets, Current",
                            "totalLabel":  "Total current assets"
                            }
                        }
                    },
                "localname":  "AssetsCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AutomobilesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Vehicles that are used primarily for transporting people.",
                            "label":  "Automobiles [Member]",
                            "terseLabel":  "Automobiles"
                            }
                        }
                    },
                "localname":  "AutomobilesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AwardTypeAxis":  {
                "auth_ref":  [
                    "r305",
                    "r339"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of award under share-based payment arrangement.",
                            "label":  "Award Type [Axis]",
                            "terseLabel":  "Award Type [Axis]"
                            }
                        }
                    },
                "localname":  "AwardTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_BalanceSheetLocationAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by location on balance sheet (statement of financial position).",
                            "label":  "Balance Sheet Location [Axis]",
                            "terseLabel":  "Balance Sheet Location [Axis]"
                            }
                        }
                    },
                "localname":  "BalanceSheetLocationAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails",
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_BalanceSheetLocationDomain":  {
                "auth_ref":  [
                    "r414",
                    "r415"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Location in the balance sheet (statement of financial position).",
                            "label":  "Balance Sheet Location [Domain]",
                            "terseLabel":  "Balance Sheet Location [Domain]"
                            }
                        }
                    },
                "localname":  "BalanceSheetLocationDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails",
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_BaseRateMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Minimum rate investor will accept.",
                            "label":  "Base Rate [Member]",
                            "terseLabel":  "Base Rate"
                            }
                        }
                    },
                "localname":  "BaseRateMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_BasisOfAccountingPolicyPolicyTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).",
                            "label":  "Basis of Accounting, Policy [Policy Text Block]",
                            "terseLabel":  "Basis of Presentation and Principles of Consolidation"
                            }
                        }
                    },
                "localname":  "BasisOfAccountingPolicyPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_BasisOfPresentationAndSignificantAccountingPoliciesTextBlock":  {
                "auth_ref":  [
                    "r127"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for the basis of presentation and significant accounting policies concepts.  Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).  Accounting policies describe all significant accounting policies of the reporting entity.",
                            "label":  "Basis of Presentation and Significant Accounting Policies [Text Block]",
                            "terseLabel":  "Summary of Significant Accounting Policies"
                            }
                        }
                    },
                "localname":  "BasisOfPresentationAndSignificantAccountingPoliciesTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_BilledContractReceivables":  {
                "auth_ref":  [
                    "r62"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_AccountsReceivableGrossCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amounts due for billed services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the Company and, at a minimum, one other party.  An example would be amounts billed to customers under contracts or programs but not paid as of the balance sheet date.",
                            "label":  "Billed Contracts Receivable",
                            "verboseLabel":  "Billed"
                            }
                        }
                    },
                "localname":  "BilledContractReceivables",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessAcquisitionAcquireeDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Identification of the acquiree in a material business combination (or series of individually immaterial business combinations), which may include the name or other type of identification of the acquiree.",
                            "label":  "Business Acquisition, Acquiree [Domain]",
                            "terseLabel":  "Business Acquisition, Acquiree [Domain]"
                            }
                        }
                    },
                "localname":  "BusinessAcquisitionAcquireeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_BusinessAcquisitionAxis":  {
                "auth_ref":  [
                    "r392",
                    "r393"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by business combination or series of individually immaterial business combinations.",
                            "label":  "Business Acquisition [Axis]",
                            "terseLabel":  "Business Acquisition [Axis]"
                            }
                        }
                    },
                "localname":  "BusinessAcquisitionAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred":  {
                "auth_ref":  [
                    "r395",
                    "r396",
                    "r397",
                    "r398"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.",
                            "label":  "Business Combination, Consideration Transferred, Liabilities Incurred",
                            "terseLabel":  "Acquisition consideration paid"
                            }
                        }
                    },
                "localname":  "BusinessCombinationConsiderationTransferredLiabilitiesIncurred",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date.",
                            "label":  "Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage",
                            "terseLabel":  "Percentage of outstanding common stock owned"
                            }
                        }
                    },
                "localname":  "BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_CashAndCashEquivalentsAtCarryingValue":  {
                "auth_ref":  [
                    "r11",
                    "r40",
                    "r107"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_AssetsCurrent",
                        "weight":  1.0
                        },
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of currency on hand as well as demand deposits with banks or financial institutions.  Includes other kinds of accounts that have the general characteristics of demand deposits.  Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.  Excludes cash and cash equivalents within disposal group and discontinued operation.",
                            "label":  "Cash and Cash Equivalents, at Carrying Value",
                            "terseLabel":  "Cash and cash equivalents"
                            }
                        }
                    },
                "localname":  "CashAndCashEquivalentsAtCarryingValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets",
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy":  {
                "auth_ref":  [
                    "r20",
                    "r108",
                    "r111",
                    "r473"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Entity's cash and cash equivalents accounting policy with respect to restricted balances.  Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits.",
                            "label":  "Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]",
                            "terseLabel":  "Restricted Cash"
                            }
                        }
                    },
                "localname":  "CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_CashAndCashEquivalentsUnrestrictedCashAndCashEquivalentsPolicy":  {
                "auth_ref":  [
                    "r108",
                    "r111"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for cash and cash equivalents with respect to unrestricted balances.",
                            "label":  "Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block]",
                            "terseLabel":  "Cash and Cash Equivalents"
                            }
                        }
                    },
                "localname":  "CashAndCashEquivalentsUnrestrictedCashAndCashEquivalentsPolicy",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents":  {
                "auth_ref":  [
                    "r101",
                    "r107",
                    "r110"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage.  Excludes amount for disposal group and discontinued operations.  Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.  Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
                            "label":  "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents",
                            "totalLabel":  "Total cash, cash equivalents and restricted cash shown in the consolidated statements of cash flows"
                            }
                        }
                    },
                "localname":  "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]",
                            "terseLabel":  "Reconciliation of cash, cash equivalents and restricted cash"
                            }
                        }
                    },
                "localname":  "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations":  {
                "auth_ref":  [
                    "r101",
                    "r107",
                    "r110"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations.  Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.  Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
                            "label":  "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations",
                            "periodEndLabel":  "Cash, cash equivalents and restricted cash \u2014 end of year",
                            "periodStartLabel":  "Cash, cash equivalents and restricted cash \u2014 beginning of year"
                            }
                        }
                    },
                "localname":  "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect":  {
                "auth_ref":  [
                    "r101",
                    "r423"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change.  Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.  Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
                            "label":  "Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect",
                            "totalLabel":  "Net increase (decrease) in cash, cash equivalents and restricted cash"
                            }
                        }
                    },
                "localname":  "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations":  {
                "auth_ref":  [
                    "r8",
                    "r101"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow (outflow) of operating activities of discontinued operations.  Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.",
                            "label":  "Cash Provided by (Used in) Operating Activities, Discontinued Operations",
                            "terseLabel":  "Net cash used in discontinued operations"
                            }
                        }
                    },
                "localname":  "CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CommitmentsAndContingencies":  {
                "auth_ref":  [
                    "r56",
                    "r250",
                    "r482",
                    "r502"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_LiabilitiesAndStockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.",
                            "label":  "Commitments and Contingencies",
                            "terseLabel":  "Commitments and contingencies (Note 14)"
                            }
                        }
                    },
                "localname":  "CommitmentsAndContingencies",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CommitmentsAndContingenciesDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Commitments and Contingencies Disclosure [Abstract]"
                            }
                        }
                    },
                "localname":  "CommitmentsAndContingenciesDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_CommitmentsAndContingenciesDisclosureTextBlock":  {
                "auth_ref":  [
                    "r249",
                    "r257"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for commitments and contingencies.",
                            "label":  "Commitments and Contingencies Disclosure [Text Block]",
                            "terseLabel":  "Commitments and Contingencies"
                            }
                        }
                    },
                "localname":  "CommitmentsAndContingenciesDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingencies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_CommonStockMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Stock that is subordinate to all other stock of the issuer.",
                            "label":  "Common Stock [Member]",
                            "terseLabel":  "Common Stock",
                            "verboseLabel":  "Common stock"
                            }
                        }
                    },
                "localname":  "CommonStockMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_CommonStockParOrStatedValuePerShare":  {
                "auth_ref":  [
                    "r30"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Face amount or stated value per share of common stock.",
                            "label":  "Common Stock, Par or Stated Value Per Share",
                            "terseLabel":  "Common stock, par value (in dollars per share)"
                            }
                        }
                    },
                "localname":  "CommonStockParOrStatedValuePerShare",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_CommonStockSharesAuthorized":  {
                "auth_ref":  [
                    "r30"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The maximum number of common shares permitted to be issued by an entity's charter and bylaws.",
                            "label":  "Common Stock, Shares Authorized",
                            "terseLabel":  "Common stock authorized (in shares)"
                            }
                        }
                    },
                "localname":  "CommonStockSharesAuthorized",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_CommonStockSharesIssued":  {
                "auth_ref":  [
                    "r30"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury).  These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized.  Shares issued include shares outstanding and shares held in the treasury.",
                            "label":  "Common Stock, Shares, Issued",
                            "periodEndLabel":  "Balance at end of period (in shares)",
                            "periodStartLabel":  "Balance at beginning of period (in shares)",
                            "terseLabel":  "Common stock issued (in shares)"
                            }
                        }
                    },
                "localname":  "CommonStockSharesIssued",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheetsParenthetical",
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_CommonStockValue":  {
                "auth_ref":  [
                    "r30"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer).  This item includes treasury stock repurchased by the entity.  Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.",
                            "label":  "Common Stock, Value, Issued",
                            "verboseLabel":  "Common stock, $0.0001 par value; 100,000 shares authorized, 62,708 and 62,181 shares issued at December 31, 2019 and 2018, respectively"
                            }
                        }
                    },
                "localname":  "CommonStockValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CompensationAndRetirementDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Retirement Benefits [Abstract]"
                            }
                        }
                    },
                "localname":  "CompensationAndRetirementDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ComprehensiveIncomeNetOfTax":  {
                "auth_ref":  [
                    "r74",
                    "r76",
                    "r77"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity.  Excludes changes in equity resulting from investments by owners and distributions to owners.",
                            "label":  "Comprehensive Income (Loss), Net of Tax, Attributable to Parent",
                            "totalLabel":  "Comprehensive income (loss) attributable to Hill International, Inc."
                            }
                        }
                    },
                "localname":  "ComprehensiveIncomeNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest":  {
                "auth_ref":  [
                    "r74",
                    "r76",
                    "r403",
                    "r404",
                    "r413"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_ComprehensiveIncomeNetOfTax",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests.  Excludes changes in equity resulting from investments by owners and distributions to owners.",
                            "label":  "Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest",
                            "terseLabel":  "Less:  Comprehensive income (loss) attributable to noncontrolling interests"
                            }
                        }
                    },
                "localname":  "ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest":  {
                "auth_ref":  [
                    "r74",
                    "r76",
                    "r402",
                    "r413"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_ComprehensiveIncomeNetOfTax",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income.  Excludes changes in equity resulting from investments by owners and distributions to owners.",
                            "label":  "Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest",
                            "totalLabel":  "Comprehensive income (loss)"
                            }
                        }
                    },
                "localname":  "ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ConcentrationRiskBenchmarkDomain":  {
                "auth_ref":  [
                    "r151",
                    "r152",
                    "r417",
                    "r418"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The denominator in a calculation of a disclosed concentration risk percentage.",
                            "label":  "Concentration Risk Benchmark [Domain]",
                            "terseLabel":  "Concentration Risk Benchmark [Domain]"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskBenchmarkDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ConcentrationRiskByBenchmarkAxis":  {
                "auth_ref":  [
                    "r151",
                    "r152",
                    "r417",
                    "r418",
                    "r514"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by benchmark of concentration risk.",
                            "label":  "Concentration Risk Benchmark [Axis]",
                            "terseLabel":  "Concentration Risk Benchmark [Axis]"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskByBenchmarkAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ConcentrationRiskByTypeAxis":  {
                "auth_ref":  [
                    "r151",
                    "r152",
                    "r417",
                    "r418",
                    "r514"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of concentration risk, for example, but not limited to, asset, liability, net assets, geographic, customer, employees, supplier, lender.",
                            "label":  "Concentration Risk Type [Axis]",
                            "terseLabel":  "Concentration Risk Type [Axis]"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskByTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ConcentrationRiskCreditRisk":  {
                "auth_ref":  [
                    "r145",
                    "r492"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for credit risk.",
                            "label":  "Concentration Risk, Credit Risk, Policy [Policy Text Block]",
                            "terseLabel":  "Concentrations of Credit Risk"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskCreditRisk",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ConcentrationRiskLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Concentration Risk [Line Items]",
                            "terseLabel":  "Concentrations of Credit Risk"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ConcentrationRiskPercentage1":  {
                "auth_ref":  [
                    "r151",
                    "r152",
                    "r417",
                    "r418"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the \"benchmark\" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.",
                            "label":  "Concentration Risk, Percentage",
                            "terseLabel":  "Percent of Total Revenue",
                            "verboseLabel":  "Percentage of billed accounts receivable"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskPercentage1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_ConcentrationRiskTable":  {
                "auth_ref":  [
                    "r148",
                    "r151",
                    "r152",
                    "r153",
                    "r417",
                    "r419"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Describes the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.",
                            "label":  "Concentration Risk [Table]",
                            "terseLabel":  "Concentration Risk [Table]"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ConcentrationRiskTypeDomain":  {
                "auth_ref":  [
                    "r151",
                    "r152",
                    "r417",
                    "r418"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "For an entity that discloses a concentration risk as a percentage of some financial balance or benchmark, identifies the type (for example, asset, liability, net assets, geographic, customer, employees, supplier, lender) of the concentration.",
                            "label":  "Concentration Risk Type [Domain]",
                            "terseLabel":  "Concentration Risk Type [Domain]"
                            }
                        }
                    },
                "localname":  "ConcentrationRiskTypeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ContractReceivableRetainageDueAfterOneYear":  {
                "auth_ref":  [
                    "r61",
                    "r458"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract to be collected after the next fiscal year following the latest fiscal year.  Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
                            "label":  "Contract Receivable Retainage, after Next Twelve Months",
                            "terseLabel":  "Retainage receivable"
                            }
                        }
                    },
                "localname":  "ContractReceivableRetainageDueAfterOneYear",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ContractWithCustomerAssetGrossCurrent":  {
                "auth_ref":  [
                    "r276",
                    "r278"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_AccountsReceivableGrossCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.",
                            "label":  "Contract with Customer, Asset, Gross, Current",
                            "terseLabel":  "Unbilled"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerAssetGrossCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ContractWithCustomerAssetNetCurrent":  {
                "auth_ref":  [
                    "r276",
                    "r278",
                    "r283"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_AssetsCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.",
                            "label":  "Contract with Customer, Asset, Net, Current",
                            "terseLabel":  "Current portion of retainage receivable"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerAssetNetCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ContractWithCustomerBasisOfPricingAxis":  {
                "auth_ref":  [
                    "r288"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by basis of pricing for contract representing right to consideration in exchange for good or service transferred to customer.",
                            "label":  "Contract with Customer, Basis of Pricing [Axis]",
                            "terseLabel":  "Contract with Customer, Basis of Pricing [Axis]"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerBasisOfPricingAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ContractWithCustomerBasisOfPricingDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Basis of pricing for contract with customer.  Includes, but is not limited to, fixed-price and time-and-materials contracts.",
                            "label":  "Contract with Customer, Basis of Pricing [Domain]",
                            "terseLabel":  "Contract with Customer, Basis of Pricing [Domain]"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerBasisOfPricingDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ContractWithCustomerLiabilityCurrent":  {
                "auth_ref":  [
                    "r276",
                    "r277",
                    "r283"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_LiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.",
                            "label":  "Contract with Customer, Liability, Current",
                            "terseLabel":  "Current portion of deferred revenue"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerLiabilityCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ContractWithCustomerLiabilityNoncurrent":  {
                "auth_ref":  [
                    "r276",
                    "r277",
                    "r283"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.",
                            "label":  "Contract with Customer, Liability, Noncurrent",
                            "terseLabel":  "Deferred revenue"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerLiabilityNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ContractWithCustomerLiabilityRevenueRecognized":  {
                "auth_ref":  [
                    "r284"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.",
                            "label":  "Contract with Customer, Liability, Revenue Recognized",
                            "terseLabel":  "Revenue recognized"
                            }
                        }
                    },
                "localname":  "ContractWithCustomerLiabilityRevenueRecognized",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CorporateNonSegmentMember":  {
                "auth_ref":  [
                    "r171"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Corporate headquarters or functional department that may not earn revenues or may earn revenues that are only incidental to the activities of the entity and is not considered an operating segment.",
                            "label":  "Corporate, Non-Segment [Member]",
                            "terseLabel":  "Corporate"
                            }
                        }
                    },
                "localname":  "CorporateNonSegmentMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationDepreciationAndAmortizationExpenseDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_CostOfRevenue":  {
                "auth_ref":  [
                    "r92"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_GrossProfit",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The aggregate cost of goods produced and sold and services rendered during the reporting period.",
                            "label":  "Cost of Revenue",
                            "terseLabel":  "Direct expenses"
                            }
                        }
                    },
                "localname":  "CostOfRevenue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CostOfSalesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Primary financial statement caption encompassing cost of sales.",
                            "label":  "Cost of Sales [Member]",
                            "terseLabel":  "Portion charged to direct expenses"
                            }
                        }
                    },
                "localname":  "CostOfSalesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_CreditConcentrationRiskMember":  {
                "auth_ref":  [
                    "r419"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Reflects the percentage that a specified receivable or amount at risk from a counterparty under a contractual arrangement is to a specified benchmark, such as total receivables, net revenues, pretax results.  Risk is the materially adverse effects of loss attributable to (a) the failure to collect a significant receivable from a major customer or group of homogeneous accounts, or (b) a failure by a counterparty to perform under terms of a contractual arrangement.",
                            "label":  "Credit Concentration Risk [Member]",
                            "terseLabel":  "Concentrations of credit risk"
                            }
                        }
                    },
                "localname":  "CreditConcentrationRiskMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_CreditFacilityAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of credit facility.  Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.",
                            "label":  "Credit Facility [Axis]",
                            "terseLabel":  "Credit Facility [Axis]"
                            }
                        }
                    },
                "localname":  "CreditFacilityAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_CreditFacilityDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Type of credit facility.  Credit facilities provide capital to borrowers without the need to structure a loan for each borrowing.",
                            "label":  "Credit Facility [Domain]",
                            "terseLabel":  "Credit Facility [Domain]"
                            }
                        }
                    },
                "localname":  "CreditFacilityDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_CurrentFederalTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r115",
                    "r381",
                    "r387"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.",
                            "label":  "Current Federal Tax Expense (Benefit)",
                            "terseLabel":  "Current"
                            }
                        }
                    },
                "localname":  "CurrentFederalTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CurrentForeignTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r121",
                    "r384"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_CurrentIncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.",
                            "label":  "Current Foreign Tax Expense (Benefit)",
                            "terseLabel":  "Current"
                            }
                        }
                    },
                "localname":  "CurrentForeignTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CurrentIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r115",
                    "r381",
                    "r387"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.",
                            "label":  "Current Income Tax Expense (Benefit)",
                            "totalLabel":  "Current"
                            }
                        }
                    },
                "localname":  "CurrentIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CurrentStateAndLocalTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r115",
                    "r381",
                    "r387"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_CurrentIncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.",
                            "label":  "Current State and Local Tax Expense (Benefit)",
                            "terseLabel":  "Current"
                            }
                        }
                    },
                "localname":  "CurrentStateAndLocalTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CustomerConcentrationRiskMember":  {
                "auth_ref":  [
                    "r149"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Reflects the percentage that revenues in the period from one or more significant customers is to net revenues, as defined by the entity, such as total net revenues, product line revenues, segment revenues.  The risk is the materially adverse effects of loss of a significant customer.",
                            "label":  "Customer Concentration Risk [Member]",
                            "terseLabel":  "Customer Concentration Risk"
                            }
                        }
                    },
                "localname":  "CustomerConcentrationRiskMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_CustomerRelationshipsMember":  {
                "auth_ref":  [
                    "r394"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Customer relationship that exists between an entity and its customer, for example, but not limited to, tenant relationships.",
                            "label":  "Customer Relationships [Member]",
                            "terseLabel":  "Client relationships"
                            }
                        }
                    },
                "localname":  "CustomerRelationshipsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_DebtDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Debt Disclosure [Abstract]"
                            }
                        }
                    },
                "localname":  "DebtDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DebtDisclosureTextBlock":  {
                "auth_ref":  [
                    "r266"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.",
                            "label":  "Debt Disclosure [Text Block]",
                            "terseLabel":  "Notes Payable and Long-Term Debt"
                            }
                        }
                    },
                "localname":  "DebtDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebt"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_DebtInstrumentAxis":  {
                "auth_ref":  [
                    "r24",
                    "r25",
                    "r26",
                    "r476",
                    "r478",
                    "r494"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of debt instrument, including, but not limited to, draws against credit facilities.",
                            "label":  "Debt Instrument [Axis]",
                            "terseLabel":  "Debt Instrument [Axis]"
                            }
                        }
                    },
                "localname":  "DebtInstrumentAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DebtInstrumentBasisSpreadOnVariableRate1":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage points added to the reference rate to compute the variable rate on the debt instrument.",
                            "label":  "Debt Instrument, Basis Spread on Variable Rate",
                            "terseLabel":  "Basis of effective interest rate (as a percent)"
                            }
                        }
                    },
                "localname":  "DebtInstrumentBasisSpreadOnVariableRate1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_DebtInstrumentCarryingAmount":  {
                "auth_ref":  [
                    "r26",
                    "r263",
                    "r478",
                    "r494"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LongTermDebt",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt.  Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.",
                            "label":  "Long-term Debt, Gross",
                            "terseLabel":  "Total notes payable and long-term debt, gross"
                            }
                        }
                    },
                "localname":  "DebtInstrumentCarryingAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DebtInstrumentFaceAmount":  {
                "auth_ref":  [
                    "r427",
                    "r429"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Face (par) amount of debt instrument at time of issuance.",
                            "label":  "Debt Instrument, Face Amount",
                            "terseLabel":  "Aggregate principal amount"
                            }
                        }
                    },
                "localname":  "DebtInstrumentFaceAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DebtInstrumentInterestRateStatedPercentage":  {
                "auth_ref":  [
                    "r53"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Contractual interest rate for funds borrowed, under the debt agreement.",
                            "label":  "Debt Instrument, Interest Rate, Stated Percentage",
                            "terseLabel":  "Stated interest rate"
                            }
                        }
                    },
                "localname":  "DebtInstrumentInterestRateStatedPercentage",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_DebtInstrumentLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Debt Instrument [Line Items]",
                            "terseLabel":  "Debt Instrument [Line Items]"
                            }
                        }
                    },
                "localname":  "DebtInstrumentLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DebtInstrumentNameDomain":  {
                "auth_ref":  [
                    "r54"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The name for the particular debt instrument or borrowing that distinguishes it from other debt instruments or borrowings, including draws against credit facilities.",
                            "label":  "Debt Instrument, Name [Domain]",
                            "terseLabel":  "Debt Instrument, Name [Domain]"
                            }
                        }
                    },
                "localname":  "DebtInstrumentNameDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_DebtInstrumentPeriodicPayment":  {
                "auth_ref":  [
                    "r54",
                    "r490"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of the required periodic payments including both interest and principal payments.",
                            "label":  "Debt Instrument, Periodic Payment",
                            "terseLabel":  "Down payment"
                            }
                        }
                    },
                "localname":  "DebtInstrumentPeriodicPayment",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DebtInstrumentTable":  {
                "auth_ref":  [
                    "r54",
                    "r116",
                    "r268",
                    "r269",
                    "r270",
                    "r271",
                    "r426",
                    "r427",
                    "r429",
                    "r491"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A table or schedule providing information pertaining to long-term debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation.  These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.",
                            "label":  "Schedule of Long-term Debt Instruments [Table]",
                            "terseLabel":  "Schedule of Long-term Debt Instruments [Table]"
                            }
                        }
                    },
                "localname":  "DebtInstrumentTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DebtInstrumentTerm":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
                            "label":  "Debt Instrument, Term",
                            "terseLabel":  "Term of debt"
                            }
                        }
                    },
                "localname":  "DebtInstrumentTerm",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet":  {
                "auth_ref":  [
                    "r264",
                    "r428"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LongTermDebt",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of unamortized debt discount (premium) and debt issuance costs.",
                            "label":  "Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net",
                            "negatedTerseLabel":  "Less: unamortized discount and deferred financing costs related to Soci\u00e9t\u00e9 G\u00e9n\u00e9rale 2017 Term Loan Facility"
                            }
                        }
                    },
                "localname":  "DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DebtPolicyTextBlock":  {
                "auth_ref":  [
                    "r111",
                    "r261"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy related to debt.  Includes, but is not limited to, debt issuance costs, the effects of refinancings, method of amortizing debt issuance costs and original issue discount, and classifications of debt.",
                            "label":  "Debt, Policy [Policy Text Block]",
                            "terseLabel":  "Deferred Financing Costs, Net"
                            }
                        }
                    },
                "localname":  "DebtPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_DeferredChargesPolicyTextBlock":  {
                "auth_ref":  [
                    "r45",
                    "r111"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for deferral and amortization of significant deferred charges.",
                            "label":  "Deferred Charges, Policy [Policy Text Block]",
                            "terseLabel":  "Deferred Rent"
                            }
                        }
                    },
                "localname":  "DeferredChargesPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]",
                            "terseLabel":  "Benefit Plans"
                            }
                        }
                    },
                "localname":  "DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DeferredFederalIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r115",
                    "r383",
                    "r387"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.",
                            "label":  "Deferred Federal Income Tax Expense (Benefit)",
                            "terseLabel":  "Deferred"
                            }
                        }
                    },
                "localname":  "DeferredFederalIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredForeignIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r115",
                    "r383",
                    "r387"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_DeferredIncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.",
                            "label":  "Deferred Foreign Income Tax Expense (Benefit)",
                            "terseLabel":  "Deferred"
                            }
                        }
                    },
                "localname":  "DeferredForeignIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredIncomeTaxAssetsNet":  {
                "auth_ref":  [
                    "r374"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  8.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        },
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsLiabilitiesNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.",
                            "label":  "Deferred Income Tax Assets, Net",
                            "terseLabel":  "Deferred income tax assets",
                            "verboseLabel":  "Deferred tax asset"
                            }
                        }
                    },
                "localname":  "DeferredIncomeTaxAssetsNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets",
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r105",
                    "r115",
                    "r383",
                    "r387"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.",
                            "label":  "Deferred Income Tax Expense (Benefit)",
                            "totalLabel":  "Deferred"
                            }
                        }
                    },
                "localname":  "DeferredIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredIncomeTaxLiabilities":  {
                "auth_ref":  [
                    "r27",
                    "r28",
                    "r370",
                    "r477",
                    "r493"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsLiabilitiesNet",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of deferred tax liability attributable to taxable temporary differences.",
                            "label":  "Deferred Tax Liabilities, Gross",
                            "negatedTotalLabel":  "Total gross deferred tax liabilities"
                            }
                        }
                    },
                "localname":  "DeferredIncomeTaxLiabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredIncomeTaxLiabilitiesNet":  {
                "auth_ref":  [
                    "r358",
                    "r374"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        },
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsLiabilitiesNet",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences with jurisdictional netting.",
                            "label":  "Deferred Income Tax Liabilities, Net",
                            "negatedLabel":  "Deferred tax liability",
                            "verboseLabel":  "Deferred income tax liabilities"
                            }
                        }
                    },
                "localname":  "DeferredIncomeTaxLiabilitiesNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets",
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredRentCredit":  {
                "auth_ref":  [
                    "r430"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.",
                            "label":  "Deferred Rent Credit",
                            "terseLabel":  "Deferred rent included in other liabilities"
                            }
                        }
                    },
                "localname":  "DeferredRentCredit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesGeneralPoliciesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r115",
                    "r383",
                    "r387"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_DeferredIncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.",
                            "label":  "Deferred State and Local Income Tax Expense (Benefit)",
                            "terseLabel":  "Deferred"
                            }
                        }
                    },
                "localname":  "DeferredStateAndLocalIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetInterestCarryforward":  {
                "auth_ref":  [
                    "r379"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  10.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible interest carryforward.",
                            "label":  "Deferred Tax Asset, Interest Carryforward",
                            "terseLabel":  "Interest limitations"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetInterestCarryforward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsDeferredIncome":  {
                "auth_ref":  [
                    "r351",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  8.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from deferred income.",
                            "label":  "Deferred Tax Assets, Deferred Income",
                            "terseLabel":  "Deferred income"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsDeferredIncome",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsGross":  {
                "auth_ref":  [
                    "r371"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.",
                            "label":  "Deferred Tax Assets, Gross",
                            "totalLabel":  "Total gross deferred tax assets"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsLiabilitiesNet":  {
                "auth_ref":  [
                    "r374"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.",
                            "label":  "Deferred Tax Assets, Net",
                            "totalLabel":  "Net deferred tax assets"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsLiabilitiesNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsNet":  {
                "auth_ref":  [
                    "r372"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsLiabilitiesNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.",
                            "label":  "Deferred Tax Assets, Net of Valuation Allowance",
                            "totalLabel":  "Net deferred tax assets"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsNetAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Deferred Tax Assets, Net [Abstract]",
                            "terseLabel":  "Deferred tax assets:"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsNetAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic":  {
                "auth_ref":  [
                    "r349",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards.  Excludes state and local operating loss carryforwards.",
                            "label":  "Deferred Tax Assets, Operating Loss Carryforwards, Domestic",
                            "terseLabel":  "Net operating loss carry forward - U.S. operations"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsOperatingLossCarryforwardsDomestic",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign":  {
                "auth_ref":  [
                    "r349",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.",
                            "label":  "Deferred Tax Assets, Operating Loss Carryforwards, Foreign",
                            "terseLabel":  "Net operating loss carry forward - foreign operations"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsOperatingLossCarryforwardsForeign",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsOther":  {
                "auth_ref":  [
                    "r351",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  13.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other.",
                            "label":  "Deferred Tax Assets, Other",
                            "terseLabel":  "Other"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsOther",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign":  {
                "auth_ref":  [
                    "r376",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  11.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards.",
                            "label":  "Deferred Tax Assets, Tax Credit Carryforwards, Foreign",
                            "terseLabel":  "Foreign tax credit"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsTaxCreditCarryforwardsForeign",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences":  {
                "auth_ref":  [
                    "r349",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensated absences (includes, but not limited to, sick and personal days).",
                            "label":  "Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Compensated Absences",
                            "terseLabel":  "Compensated absences"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses":  {
                "auth_ref":  [
                    "r349",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee bonuses.",
                            "label":  "Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Bonuses",
                            "terseLabel":  "Bonus accrual"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation":  {
                "auth_ref":  [
                    "r349",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  9.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation.",
                            "label":  "Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation",
                            "terseLabel":  "Labor contingencies"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost":  {
                "auth_ref":  [
                    "r349",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.",
                            "label":  "Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost",
                            "terseLabel":  "Share-based compensation"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities":  {
                "auth_ref":  [
                    "r349",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  12.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities.",
                            "label":  "Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities",
                            "terseLabel":  "Accrued expenses"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts":  {
                "auth_ref":  [
                    "r349",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts.",
                            "label":  "Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts",
                            "terseLabel":  "Allowance for doubtful accounts"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses":  {
                "auth_ref":  [
                    "r350",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized losses on foreign currency transactions.",
                            "label":  "Deferred Tax Assets, Unrealized Currency Losses",
                            "verboseLabel":  "Foreign income taxes on currency translation"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsUnrealizedCurrencyLosses",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsValuationAllowance":  {
                "auth_ref":  [
                    "r373"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsNet",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.",
                            "label":  "Deferred Tax Assets, Valuation Allowance",
                            "negatedLabel":  "Valuation allowances"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsValuationAllowance",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets":  {
                "auth_ref":  [
                    "r351",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_DeferredIncomeTaxLiabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of deferred tax liability attributable to taxable temporary differences from intangible assets including goodwill.",
                            "label":  "Deferred Tax Liabilities, Goodwill and Intangible Assets",
                            "negatedLabel":  "Intangible assets"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilitiesGoodwillAndIntangibleAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxLiabilitiesNetAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Deferred Tax Liabilities, Net [Abstract]",
                            "terseLabel":  "Deferred tax liabilities:"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilitiesNetAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DeferredTaxLiabilitiesPrepaidExpenses":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_DeferredIncomeTaxLiabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.",
                            "label":  "Deferred Tax Liabilities, Prepaid Expenses",
                            "negatedLabel":  "Prepaid expenses"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilitiesPrepaidExpenses",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment":  {
                "auth_ref":  [
                    "r351",
                    "r379",
                    "r380"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_DeferredIncomeTaxLiabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.",
                            "label":  "Deferred Tax Liabilities, Property, Plant and Equipment",
                            "negatedLabel":  "Depreciation"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilitiesPropertyPlantAndEquipment",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation":  {
                "auth_ref":  [
                    "r293"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.",
                            "label":  "Defined Benefit Plan, Accumulated Benefit Obligation",
                            "terseLabel":  "Fair value of projected benefits"
                            }
                        }
                    },
                "localname":  "DefinedBenefitPlanAccumulatedBenefitObligation",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate":  {
                "auth_ref":  [
                    "r295"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.",
                            "label":  "Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate",
                            "terseLabel":  "Assumed discount rate (as a percent)"
                            }
                        }
                    },
                "localname":  "DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease":  {
                "auth_ref":  [
                    "r296"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan.  Plan includes, but is not limited to, pay-related defined benefit plan.",
                            "label":  "Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase",
                            "terseLabel":  "Assumed annual salary increase (as a percent)"
                            }
                        }
                    },
                "localname":  "DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost":  {
                "auth_ref":  [
                    "r294",
                    "r298",
                    "r299"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of net periodic benefit cost (credit) for defined benefit plan.",
                            "label":  "Defined Benefit Plan, Net Periodic Benefit Cost (Credit)",
                            "terseLabel":  "Current period benefit expense"
                            }
                        }
                    },
                "localname":  "DefinedBenefitPlanNetPeriodicBenefitCost",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DefinedContributionPlanCostRecognized":  {
                "auth_ref":  [
                    "r300"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cost for defined contribution plan.",
                            "label":  "Defined Contribution Plan, Cost",
                            "terseLabel":  "Expense related to savings plan recognized"
                            }
                        }
                    },
                "localname":  "DefinedContributionPlanCostRecognized",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.",
                            "label":  "Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay",
                            "terseLabel":  "Matching contribution by employer as a percentage of employee compensation"
                            }
                        }
                    },
                "localname":  "DefinedContributionPlanEmployerMatchingContributionPercent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.",
                            "label":  "Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent",
                            "terseLabel":  "Matching contribution by employer as a percentage of employee's considered compensation, maximum"
                            }
                        }
                    },
                "localname":  "DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_DepreciationAndAmortization":  {
                "auth_ref":  [
                    "r105",
                    "r235"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.",
                            "label":  "Depreciation, Depletion and Amortization, Nonproduction",
                            "terseLabel":  "Total depreciation expense"
                            }
                        }
                    },
                "localname":  "DepreciationAndAmortization",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DilutiveSecuritiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]",
                            "terseLabel":  "Effect of dilutive securities:"
                            }
                        }
                    },
                "localname":  "DilutiveSecuritiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DisaggregationOfRevenueLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Disaggregation of Revenue [Line Items]",
                            "terseLabel":  "Disaggregation of Revenue [Line Items]"
                            }
                        }
                    },
                "localname":  "DisaggregationOfRevenueLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DisaggregationOfRevenueTable":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.",
                            "label":  "Disaggregation of Revenue [Table]",
                            "terseLabel":  "Disaggregation of Revenue [Table]"
                            }
                        }
                    },
                "localname":  "DisaggregationOfRevenueTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DisaggregationOfRevenueTableTextBlock":  {
                "auth_ref":  [
                    "r282"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.",
                            "label":  "Disaggregation of Revenue [Table Text Block]",
                            "terseLabel":  "Disaggregation of Revenue"
                            }
                        }
                    },
                "localname":  "DisaggregationOfRevenueTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock":  {
                "auth_ref":  [
                    "r345"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for share-based payment arrangement.",
                            "label":  "Share-based Payment Arrangement [Text Block]",
                            "terseLabel":  "Share-Based Compensation"
                            }
                        }
                    },
                "localname":  "DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensation"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Share-based Payment Arrangement [Abstract]"
                            }
                        }
                    },
                "localname":  "DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DiscontinuedOperationAdditionalDisclosuresAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Discontinued Operation, Additional Disclosures [Abstract]",
                            "terseLabel":  "Discontinued operations:"
                            }
                        }
                    },
                "localname":  "DiscontinuedOperationAdditionalDisclosuresAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax":  {
                "auth_ref":  [
                    "r1",
                    "r3",
                    "r5",
                    "r9"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.",
                            "label":  "Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax",
                            "terseLabel":  "Gain on disposal of discontinued operations, net of tax"
                            }
                        }
                    },
                "localname":  "DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_EarningsPerShareBasic",
                        "weight":  1.0
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation.",
                            "label":  "Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share",
                            "terseLabel":  "Basic loss per common share from discontinued operations (in dollars per share)"
                            }
                        }
                    },
                "localname":  "DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerBasicShare",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_EarningsPerShareDiluted",
                        "weight":  1.0
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation.",
                            "label":  "Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share",
                            "terseLabel":  "Diluted loss per common share from discontinued operations (in dollars per share)"
                            }
                        }
                    },
                "localname":  "DiscontinuedOperationIncomeLossFromDiscontinuedOperationNetOfTaxPerDilutedShare",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_DiscontinuedOperationsPolicyTextBlock":  {
                "auth_ref":  [
                    "r7",
                    "r10",
                    "r111",
                    "r139"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for discontinued operations.  Includes, but is not limited to, method of interest allocation to a discontinued operation.",
                            "label":  "Discontinued Operations, Policy [Policy Text Block]",
                            "terseLabel":  "Construction Claims Group Sale"
                            }
                        }
                    },
                "localname":  "DiscontinuedOperationsPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_DomesticCountryMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Designated tax department of the government that is entitled to levy and collect income taxes from the entity in its country of domicile.",
                            "label":  "Domestic Tax Authority [Member]",
                            "terseLabel":  "Federal"
                            }
                        }
                    },
                "localname":  "DomesticCountryMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_DueFromAffiliateCurrent":  {
                "auth_ref":  [
                    "r59",
                    "r122",
                    "r448",
                    "r450",
                    "r452",
                    "r454"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_AssetsCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of receivables due from an entity that is affiliated with the reporting entity by means of direct or indirect ownership, due within 1 year (or 1 business cycle).",
                            "label":  "Due from Affiliate, Current",
                            "terseLabel":  "Accounts receivable - affiliates, net"
                            }
                        }
                    },
                "localname":  "DueFromAffiliateCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EarningsPerShareBasic":  {
                "auth_ref":  [
                    "r86",
                    "r129",
                    "r133",
                    "r135",
                    "r136",
                    "r137",
                    "r141",
                    "r488",
                    "r508"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.",
                            "label":  "Earnings Per Share, Basic",
                            "totalLabel":  "Basic income (loss) per common share - Hill International, Inc. (in dollars per share)"
                            }
                        }
                    },
                "localname":  "EarningsPerShareBasic",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_EarningsPerShareDiluted":  {
                "auth_ref":  [
                    "r86",
                    "r129",
                    "r133",
                    "r135",
                    "r136",
                    "r137",
                    "r141",
                    "r488",
                    "r508"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.",
                            "label":  "Earnings Per Share, Diluted",
                            "totalLabel":  "Diluted income (loss) per common share - Hill International, Inc. (in dollars per share)"
                            }
                        }
                    },
                "localname":  "EarningsPerShareDiluted",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_EarningsPerSharePolicyTextBlock":  {
                "auth_ref":  [
                    "r111",
                    "r138",
                    "r139",
                    "r140"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for computing basic and diluted earnings or loss per share for each class of common stock and participating security.  Addresses all significant policy factors, including any antidilutive items that have been excluded from the computation and takes into account stock dividends, splits and reverse splits that occur after the balance sheet date of the latest reporting period but before the issuance of the financial statements.",
                            "label":  "Earnings Per Share, Policy [Policy Text Block]",
                            "terseLabel":  "Earnings (loss) per Share ('EPS')"
                            }
                        }
                    },
                "localname":  "EarningsPerSharePolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents":  {
                "auth_ref":  [
                    "r423"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) from effect of exchange rate changes on cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; held in foreign currencies.  Excludes amounts for disposal group and discontinued operations.  Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.  Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
                            "label":  "Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents",
                            "terseLabel":  "Effect of foreign exchange rate changes on cash"
                            }
                        }
                    },
                "localname":  "EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EffectiveIncomeTaxRateContinuingOperations":  {
                "auth_ref":  [
                    "r120",
                    "r360",
                    "r361"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.",
                            "label":  "Effective Income Tax Rate Reconciliation, Percent",
                            "terseLabel":  "Income taxes effective tax rates"
                            }
                        }
                    },
                "localname":  "EffectiveIncomeTaxRateContinuingOperations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1":  {
                "auth_ref":  [
                    "r338"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
                            "label":  "Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition",
                            "terseLabel":  "Weighted-average service period over which unrecognized compensation cost is to be recognized"
                            }
                        }
                    },
                "localname":  "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions":  {
                "auth_ref":  [
                    "r338"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cost to be recognized for nonvested award under share-based payment arrangement.  Excludes share and unit options.",
                            "label":  "Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount",
                            "terseLabel":  "Unrecognized compensation cost"
                            }
                        }
                    },
                "localname":  "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions":  {
                "auth_ref":  [
                    "r338"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cost to be recognized for option under share-based payment arrangement.",
                            "label":  "Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount",
                            "terseLabel":  "Total unrecognized compensation cost related to non-vested options (in dollars)"
                            }
                        }
                    },
                "localname":  "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EmployeeStockMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "An Employee Stock Purchase Plan is a tax-efficient means by which employees of a corporation can purchase the corporation's stock.",
                            "label":  "Employee Stock [Member]",
                            "terseLabel":  "Employee Stock"
                            }
                        }
                    },
                "localname":  "EmployeeStockMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_EmployeeStockOptionMember":  {
                "auth_ref":  [
                    "r335"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Share-based payment arrangement granting right, subject to vesting and other restrictions, to purchase or sell certain number of shares at predetermined price for specified period of time.",
                            "label":  "Share-based Payment Arrangement, Option [Member]",
                            "terseLabel":  "Stock options",
                            "verboseLabel":  "Employee Stock Option"
                            }
                        }
                    },
                "localname":  "EmployeeStockOptionMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_EntityWideRevenueMajorCustomerLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Revenue, Major Customer [Line Items]",
                            "terseLabel":  "Consulting Fee Revenue and Total Revenue By Client Type:"
                            }
                        }
                    },
                "localname":  "EntityWideRevenueMajorCustomerLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_EquityComponentDomain":  {
                "auth_ref":  [
                    "r267"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Components of equity are the parts of the total Equity balance including that which is allocated to common, preferred, treasury stock, retained earnings, etc.",
                            "label":  "Equity Component [Domain]",
                            "terseLabel":  "Equity Component [Domain]"
                            }
                        }
                    },
                "localname":  "EquityComponentDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FairValueMeasurementPolicyPolicyTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for fair value measurements of financial and non-financial assets, liabilities and instruments classified in shareholders' equity.  Disclosures include, but are not limited to, how an entity that manages a group of financial assets and liabilities on the basis of its net exposure measures the fair value of those assets and liabilities.",
                            "label":  "Fair Value Measurement, Policy [Policy Text Block]",
                            "terseLabel":  "Fair Value Measurements"
                            }
                        }
                    },
                "localname":  "FairValueMeasurementPolicyPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations":  {
                "auth_ref":  [
                    "r119",
                    "r359"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of current and deferred federal income tax expense (benefit) attributable to income (loss) from continuing operations.",
                            "label":  "Federal Income Tax Expense (Benefit), Continuing Operations",
                            "totalLabel":  "Total"
                            }
                        }
                    },
                "localname":  "FederalIncomeTaxExpenseBenefitContinuingOperations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperationsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Federal Income Tax Expense (Benefit), Continuing Operations [Abstract]",
                            "terseLabel":  "U.S. federal"
                            }
                        }
                    },
                "localname":  "FederalIncomeTaxExpenseBenefitContinuingOperationsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FinancialInstrumentAxis":  {
                "auth_ref":  [
                    "r198",
                    "r204",
                    "r205",
                    "r206",
                    "r207",
                    "r208",
                    "r209",
                    "r210",
                    "r211"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of financial instrument.",
                            "label":  "Financial Instrument [Axis]",
                            "terseLabel":  "Financial Instrument [Axis]"
                            }
                        }
                    },
                "localname":  "FinancialInstrumentAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesInvestmentsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetUsefulLife":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
                            "label":  "Finite-Lived Intangible Asset, Useful Life",
                            "terseLabel":  "Estimated lives of intangible assets"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetUsefulLife",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAndGoodwillDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization":  {
                "auth_ref":  [
                    "r229"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_IntangibleAssetsNetExcludingGoodwill",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.",
                            "label":  "Finite-Lived Intangible Assets, Accumulated Amortization",
                            "terseLabel":  "Accumulated Amortization"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAccumulatedAmortization",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths":  {
                "auth_ref":  [
                    "r231"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year.  Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
                            "label":  "Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months",
                            "terseLabel":  "2020"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsEstimatedAmortizationExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive":  {
                "auth_ref":  [
                    "r231"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year.  Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
                            "label":  "Finite-Lived Intangible Assets, Amortization Expense, Year Five",
                            "terseLabel":  "2024"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAmortizationExpenseYearFive",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsEstimatedAmortizationExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour":  {
                "auth_ref":  [
                    "r231"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year.  Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
                            "label":  "Finite-Lived Intangible Assets, Amortization Expense, Year Four",
                            "terseLabel":  "2023"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAmortizationExpenseYearFour",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsEstimatedAmortizationExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree":  {
                "auth_ref":  [
                    "r231"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year.  Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
                            "label":  "Finite-Lived Intangible Assets, Amortization Expense, Year Three",
                            "terseLabel":  "2022"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAmortizationExpenseYearThree",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsEstimatedAmortizationExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo":  {
                "auth_ref":  [
                    "r231"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year.  Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
                            "label":  "Finite-Lived Intangible Assets, Amortization Expense, Year Two",
                            "terseLabel":  "2021"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsEstimatedAmortizationExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis":  {
                "auth_ref":  [
                    "r225",
                    "r226",
                    "r229",
                    "r232",
                    "r459"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by major type or class of finite-lived intangible assets.",
                            "label":  "Finite-Lived Intangible Assets by Major Class [Axis]",
                            "terseLabel":  "Finite-Lived Intangible Assets by Major Class [Axis]"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsByMajorClassAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]",
                            "terseLabel":  "Estimated amortization expense of intangible assets for the next five years"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsEstimatedAmortizationExpenseDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsGross":  {
                "auth_ref":  [
                    "r229",
                    "r459"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_IntangibleAssetsNetExcludingGoodwill",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.",
                            "label":  "Finite-Lived Intangible Assets, Gross",
                            "terseLabel":  "Gross Carrying Amount"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Finite-Lived Intangible Assets [Line Items]",
                            "terseLabel":  "Intangible Assets"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAndGoodwillDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain":  {
                "auth_ref":  [
                    "r225",
                    "r228"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The major class of finite-lived intangible asset (for example, patents, trademarks, copyrights, etc.) A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.",
                            "label":  "Finite-Lived Intangible Assets, Major Class Name [Domain]",
                            "terseLabel":  "Finite-Lived Intangible Assets, Major Class Name [Domain]"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsMajorClassNameDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FixedPriceContractMember":  {
                "auth_ref":  [
                    "r288"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Contract with customer in which amount of consideration is fixed.",
                            "label":  "Fixed-price Contract [Member]",
                            "terseLabel":  "Fixed Price"
                            }
                        }
                    },
                "localname":  "FixedPriceContractMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ForeignCountryMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Designated tax departments of governments entitled to levy and collect income taxes from the entity outside the entity's country of domicile.",
                            "label":  "Foreign Tax Authority [Member]",
                            "terseLabel":  "Foreign"
                            }
                        }
                    },
                "localname":  "ForeignCountryMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ForeignCurrencyTransactionGainLossBeforeTax":  {
                "auth_ref":  [
                    "r420",
                    "r421",
                    "r422"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  8.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.",
                            "label":  "Foreign Currency Transaction Gain (Loss), before Tax",
                            "negatedLabel":  "Unrealized foreign exchange (gains) losses on inter-company balances"
                            }
                        }
                    },
                "localname":  "ForeignCurrencyTransactionGainLossBeforeTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock":  {
                "auth_ref":  [
                    "r111",
                    "r422",
                    "r425"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for (1) transactions denominated in a currency other than the reporting enterprise's functional currency, (2) translating foreign currency financial statements that are incorporated into the financial statements of the reporting enterprise by consolidation, combination, or the equity method of accounting, and (3) remeasurement of the financial statements of a foreign reporting enterprise in a hyperinflationary economy.",
                            "label":  "Foreign Currency Transactions and Translations Policy [Policy Text Block]",
                            "terseLabel":  "Foreign Currency Translations and Transactions"
                            }
                        }
                    },
                "localname":  "ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations":  {
                "auth_ref":  [
                    "r119"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of current and deferred foreign income tax expense (benefit) attributable to income (loss) from continuing operations.",
                            "label":  "Foreign Income Tax Expense (Benefit), Continuing Operations",
                            "totalLabel":  "Total"
                            }
                        }
                    },
                "localname":  "ForeignIncomeTaxExpenseBenefitContinuingOperations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperationsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Foreign Income Tax Expense (Benefit), Continuing Operations [Abstract]",
                            "terseLabel":  "Foreign jurisdictions"
                            }
                        }
                    },
                "localname":  "ForeignIncomeTaxExpenseBenefitContinuingOperationsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FurnitureAndFixturesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities.  Examples include, but are not limited to, desks, chairs, tables, and bookcases.",
                            "label":  "Furniture and Fixtures [Member]",
                            "terseLabel":  "Furniture and equipment"
                            }
                        }
                    },
                "localname":  "FurnitureAndFixturesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_GeographicConcentrationRiskMember":  {
                "auth_ref":  [
                    "r150"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Reflects the percentage that a specified dollar value on the balance sheet or income statement in the period from one or more specified geographic areas is to a corresponding consolidated, segment, or product line amount.  Risk is the materially adverse effects of economic decline or antagonistic political actions resulting in loss of assets, sales volume, labor supply, or source of materials and supplies in a US state or a specified country, continent, or region such as EMEA (Europe, Middle East, Africa).",
                            "label":  "Geographic Concentration Risk [Member]",
                            "terseLabel":  "Geographic concentration risk"
                            }
                        }
                    },
                "localname":  "GeographicConcentrationRiskMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_Goodwill":  {
                "auth_ref":  [
                    "r213",
                    "r215"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.",
                            "label":  "Goodwill",
                            "periodEndLabel":  "Balance at the end of the period",
                            "periodStartLabel":  "Balance at the beginning of the period",
                            "terseLabel":  "Goodwill"
                            }
                        }
                    },
                "localname":  "Goodwill",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets",
                    "http://www.hillintl.com/role/GoodwillDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Goodwill and Intangible Assets Disclosure [Abstract]"
                            }
                        }
                    },
                "localname":  "GoodwillAndIntangibleAssetsDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy":  {
                "auth_ref":  [
                    "r111",
                    "r219"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for goodwill.  This accounting policy also may address how an entity assesses and measures impairment of goodwill, how reporting units are determined, how goodwill is allocated to such units, and how the fair values of the reporting units are determined.",
                            "label":  "Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]",
                            "terseLabel":  "Goodwill"
                            }
                        }
                    },
                "localname":  "GoodwillAndIntangibleAssetsGoodwillPolicy",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_GoodwillDisclosureTextBlock":  {
                "auth_ref":  [
                    "r222"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for goodwill.",
                            "label":  "Goodwill Disclosure [Text Block]",
                            "terseLabel":  "Goodwill"
                            }
                        }
                    },
                "localname":  "GoodwillDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/Goodwill"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_GoodwillImpairedAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Goodwill, Impaired [Abstract]",
                            "terseLabel":  "Goodwill"
                            }
                        }
                    },
                "localname":  "GoodwillImpairedAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAndGoodwillDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_GoodwillImpairmentLoss":  {
                "auth_ref":  [
                    "r105",
                    "r214",
                    "r216",
                    "r220"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.",
                            "label":  "Goodwill, Impairment Loss",
                            "terseLabel":  "Goodwill impairment"
                            }
                        }
                    },
                "localname":  "GoodwillImpairmentLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/GoodwillDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAndGoodwillDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_GoodwillRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Goodwill [Roll Forward]",
                            "terseLabel":  "Goodwill [Roll Forward]"
                            }
                        }
                    },
                "localname":  "GoodwillRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/GoodwillDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments":  {
                "auth_ref":  [
                    "r217",
                    "r218",
                    "r391"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.",
                            "label":  "Goodwill, Translation and Purchase Accounting Adjustments",
                            "terseLabel":  "Translation adjustments"
                            }
                        }
                    },
                "localname":  "GoodwillTranslationAndPurchaseAccountingAdjustments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/GoodwillDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_GrossProfit":  {
                "auth_ref":  [
                    "r90"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_OperatingIncomeLoss",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.",
                            "label":  "Gross Profit",
                            "totalLabel":  "Gross profit"
                            }
                        }
                    },
                "localname":  "GrossProfit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ImpairmentOfIntangibleAssetsFinitelived":  {
                "auth_ref":  [
                    "r105",
                    "r233"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.",
                            "label":  "Impairment of Intangible Assets, Finite-lived",
                            "terseLabel":  "Impairment loss"
                            }
                        }
                    },
                "localname":  "ImpairmentOfIntangibleAssetsFinitelived",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsEstimatedAmortizationExpenseDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAndGoodwillDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ImpairmentOrDisposalOfLongLivedAssetsIncludingIntangibleAssetsPolicyPolicyTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for the impairment and disposal of long-lived assets including goodwill and other intangible assets.",
                            "label":  "Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block]",
                            "terseLabel":  "Long-Lived Assets"
                            }
                        }
                    },
                "localname":  "ImpairmentOrDisposalOfLongLivedAssetsIncludingIntangibleAssetsPolicyPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_IncomeLossFromContinuingOperations":  {
                "auth_ref":  [
                    "r91",
                    "r106",
                    "r137",
                    "r401"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of income (loss) from continuing operations attributable to the parent.",
                            "label":  "Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent",
                            "totalLabel":  "Net income (loss) from continuing operations attributable to Hill International, Inc."
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity":  {
                "auth_ref":  [
                    "r399",
                    "r402"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperations",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of income (loss) from continuing operations attributable to the noncontrolling interest.",
                            "label":  "Income (Loss) from Continuing Operations, Net of Tax, Attributable to Noncontrolling Interest",
                            "terseLabel":  "Less: net earnings - noncontrolling interest"
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperationsAttributableToNoncontrollingEntity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic":  {
                "auth_ref":  [
                    "r118"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.",
                            "label":  "Income (Loss) from Continuing Operations before Income Taxes, Domestic",
                            "terseLabel":  "United States"
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest":  {
                "auth_ref":  [
                    "r83",
                    "r129",
                    "r472",
                    "r485",
                    "r509"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.",
                            "label":  "Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest",
                            "totalLabel":  "Income (loss) before income taxes"
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign":  {
                "auth_ref":  [
                    "r118"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.",
                            "label":  "Income (Loss) from Continuing Operations before Income Taxes, Foreign",
                            "terseLabel":  "Foreign jurisdictions"
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments":  {
                "auth_ref":  [
                    "r118"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.",
                            "label":  "Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest",
                            "totalLabel":  "Earnings (loss) before income taxes"
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract]",
                            "terseLabel":  "Components of (loss) earnings before income taxes"
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestmentsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest":  {
                "auth_ref":  [
                    "r402"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  1.0
                        },
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_ProfitLoss",
                        "weight":  1.0
                        },
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.",
                            "label":  "Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest",
                            "terseLabel":  "Income (loss) from continuing operations",
                            "totalLabel":  "Income (loss) from continuing operations",
                            "verboseLabel":  "Income (loss) from continuing operations"
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeLossFromContinuingOperationsPerBasicShare":  {
                "auth_ref":  [
                    "r81",
                    "r86",
                    "r133",
                    "r135",
                    "r136",
                    "r483",
                    "r486",
                    "r488",
                    "r505"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_EarningsPerShareBasic",
                        "weight":  1.0
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.",
                            "label":  "Income (Loss) from Continuing Operations, Per Basic Share",
                            "terseLabel":  "Basic income (loss) per common share from continuing operations - Hill International, Inc. (in dollars per share)",
                            "verboseLabel":  "Basic income (loss) per common share from continuing operations - Hill International, Inc. (in dollars per share)"
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperationsPerBasicShare",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare":  {
                "auth_ref":  [
                    "r81",
                    "r86",
                    "r133",
                    "r135",
                    "r136",
                    "r137",
                    "r488",
                    "r505",
                    "r508"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_EarningsPerShareDiluted",
                        "weight":  1.0
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.",
                            "label":  "Income (Loss) from Continuing Operations, Per Diluted Share",
                            "terseLabel":  "Diluted income (loss) per common share from continuing operations - Hill International, Inc. (in dollars per share)"
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperationsPerDilutedShare",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax":  {
                "auth_ref":  [
                    "r1",
                    "r2",
                    "r3",
                    "r4",
                    "r5",
                    "r9",
                    "r86",
                    "r506"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_ProfitLoss",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest.  Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.",
                            "label":  "Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest",
                            "totalLabel":  "Total (loss) earnings from discontinued operations"
                            }
                        }
                    },
                "localname":  "IncomeLossFromDiscontinuedOperationsNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeLossFromEquityMethodInvestments":  {
                "auth_ref":  [
                    "r84",
                    "r105",
                    "r161",
                    "r193",
                    "r484",
                    "r504"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_OperatingIncomeLoss",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of income (loss) for proportionate share of equity method investee's income (loss).",
                            "label":  "Income (Loss) from Equity Method Investments",
                            "terseLabel":  "Plus:  Share of profit of equity method affiliates"
                            }
                        }
                    },
                "localname":  "IncomeLossFromEquityMethodInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeStatementAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Income Statement [Abstract]"
                            }
                        }
                    },
                "localname":  "IncomeStatementAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncomeStatementLocationAxis":  {
                "auth_ref":  [
                    "r239"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by location in the income statement.",
                            "label":  "Income Statement Location [Axis]",
                            "terseLabel":  "Income Statement Location [Axis]"
                            }
                        }
                    },
                "localname":  "IncomeStatementLocationAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails",
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails",
                    "http://www.hillintl.com/role/BenefitPlansDetails",
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails",
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesReclassificationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncomeStatementLocationDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Location in the income statement.",
                            "label":  "Income Statement Location [Domain]",
                            "terseLabel":  "Income Statement Location [Domain]"
                            }
                        }
                    },
                "localname":  "IncomeStatementLocationDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails",
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails",
                    "http://www.hillintl.com/role/BenefitPlansDetails",
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails",
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesReclassificationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_IncomeTaxAuthorityAxis":  {
                "auth_ref":  [
                    "r363"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by tax jurisdiction.",
                            "label":  "Income Tax Authority [Axis]",
                            "terseLabel":  "Income Tax Authority [Axis]"
                            }
                        }
                    },
                "localname":  "IncomeTaxAuthorityAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncomeTaxAuthorityDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Agency, division or body classification that levies income taxes, examines tax returns for compliance, or grants exemptions from or makes other decisions pertaining to income taxes.",
                            "label":  "Income Tax Authority [Domain]",
                            "terseLabel":  "Income Tax Authority [Domain]"
                            }
                        }
                    },
                "localname":  "IncomeTaxAuthorityDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_IncomeTaxDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Income Tax Disclosure [Abstract]"
                            }
                        }
                    },
                "localname":  "IncomeTaxDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncomeTaxDisclosureTextBlock":  {
                "auth_ref":  [
                    "r390"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for income taxes.  Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.",
                            "label":  "Income Tax Disclosure [Text Block]",
                            "terseLabel":  "Income Taxes"
                            }
                        }
                    },
                "localname":  "IncomeTaxDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxes"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_IncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r115",
                    "r162",
                    "r388"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest",
                        "weight":  -1.0
                        },
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.",
                            "label":  "Income Tax Expense (Benefit)",
                            "terseLabel":  "Income tax (benefit) expense",
                            "totalLabel":  "Total",
                            "verboseLabel":  "Income tax expense"
                            }
                        }
                    },
                "localname":  "IncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails",
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Income Tax Expense (Benefit), Continuing Operations [Abstract]",
                            "terseLabel":  "Income tax (benefit) expense"
                            }
                        }
                    },
                "localname":  "IncomeTaxExpenseBenefitContinuingOperationsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncomeTaxExpenseBenefitContinuingOperationsByJurisdictionAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Income Tax Expense (Benefit), Continuing Operations, by Jurisdiction [Abstract]",
                            "terseLabel":  "Income tax (benefit) expense"
                            }
                        }
                    },
                "localname":  "IncomeTaxExpenseBenefitContinuingOperationsByJurisdictionAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Effective Income Tax Rate Reconciliation, Amount [Abstract]",
                            "terseLabel":  "Reconciliation of income taxes based on the statutory U.S. federal income tax and the Company's effective income tax rate"
                            }
                        }
                    },
                "localname":  "IncomeTaxExpenseBenefitContinuingOperationsIncomeTaxReconciliationAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncomeTaxPolicyTextBlock":  {
                "auth_ref":  [
                    "r78",
                    "r111",
                    "r356",
                    "r357",
                    "r368",
                    "r369",
                    "r375",
                    "r389",
                    "r518"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.",
                            "label":  "Income Tax, Policy [Policy Text Block]",
                            "terseLabel":  "Income Taxes"
                            }
                        }
                    },
                "localname":  "IncomeTaxPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance":  {
                "auth_ref":  [
                    "r355",
                    "r360",
                    "r361"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.",
                            "label":  "Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount",
                            "terseLabel":  "Change in the valuation allowance"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential":  {
                "auth_ref":  [
                    "r113",
                    "r360",
                    "r361"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign income tax expense (benefit).",
                            "label":  "Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount",
                            "terseLabel":  "Foreign tax expense"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationForeignIncomeTaxRateDifferential",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate":  {
                "auth_ref":  [
                    "r114",
                    "r360",
                    "r361"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.",
                            "label":  "Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount",
                            "terseLabel":  "Statutory federal income tax (benefit)"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost":  {
                "auth_ref":  [
                    "r360",
                    "r361"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement.  Includes, but is not limited to, expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.",
                            "label":  "Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount",
                            "terseLabel":  "Stock options"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationOtherAdjustments":  {
                "auth_ref":  [
                    "r360"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  13.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.",
                            "label":  "Effective Income Tax Rate Reconciliation, Other Adjustments, Amount",
                            "terseLabel":  "Other"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationOtherAdjustments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes":  {
                "auth_ref":  [
                    "r360",
                    "r361"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  9.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit).",
                            "label":  "Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount",
                            "terseLabel":  "Prior period adjustments"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationPriorYearIncomeTaxes",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes":  {
                "auth_ref":  [
                    "r114",
                    "r360",
                    "r361"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).",
                            "label":  "Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount",
                            "terseLabel":  "State and local income taxes, net of federal income tax benefit"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationStateAndLocalIncomeTaxes",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationTaxContingencies":  {
                "auth_ref":  [
                    "r360",
                    "r361"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in income tax contingencies.  Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.",
                            "label":  "Effective Income Tax Rate Reconciliation, Tax Contingency, Amount",
                            "terseLabel":  "Net liability additions for uncertain tax positions"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationTaxContingencies",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesReconciliationOfIncomeTaxesAndDeferredTaxAssetsLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxesPaid":  {
                "auth_ref":  [
                    "r102",
                    "r109"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.",
                            "label":  "Income Taxes Paid",
                            "terseLabel":  "Income taxes paid"
                            }
                        }
                    },
                "localname":  "IncomeTaxesPaid",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxesReceivable":  {
                "auth_ref":  [
                    "r60",
                    "r481",
                    "r503"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_AssetsCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.",
                            "label":  "Income Taxes Receivable, Current",
                            "terseLabel":  "Income taxes receivable"
                            }
                        }
                    },
                "localname":  "IncomeTaxesReceivable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  15.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.",
                            "label":  "Increase (Decrease) in Accounts Payable and Accrued Liabilities",
                            "terseLabel":  "Accounts payable and accrued expenses"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInAccountsPayableAndAccruedLiabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInAccountsReceivable":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  9.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.",
                            "label":  "Increase (Decrease) in Accounts Receivable",
                            "negatedLabel":  "Accounts receivable"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInAccountsReceivable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  16.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.",
                            "label":  "Increase (Decrease) in Income Taxes Payable",
                            "terseLabel":  "Income taxes payable"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInAccruedIncomeTaxesPayable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInContractWithCustomerAsset":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  17.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.",
                            "label":  "Increase (Decrease) in Contract with Customer, Asset",
                            "negatedTerseLabel":  "Deferred revenue"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInContractWithCustomerAsset",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInDueFromAffiliatesCurrent":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  10.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The increase (decrease) during the reporting period in current receivables (due within one year or one operating cycle) to be collected from an entity that is controlling, under the control of, or within the same control group as the reporting entity by means of direct or indirect ownership.",
                            "label":  "Increase (Decrease) in Due from Affiliates, Current",
                            "negatedLabel":  "Accounts receivable - affiliates"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInDueFromAffiliatesCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInIncomeTaxesReceivable":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  12.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The increase (decrease) during the reporting period in income taxes receivable, which represents the amount due from tax authorities for refunds of overpayments or recoveries of income taxes paid.",
                            "label":  "Increase (Decrease) in Income Taxes Receivable",
                            "negatedLabel":  "Income taxes receivable"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInIncomeTaxesReceivable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInOperatingCapitalAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Increase (Decrease) in Operating Capital [Abstract]",
                            "terseLabel":  "Changes in operating assets and liabilities (net of acquisitions):"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInOperatingCapitalAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncreaseDecreaseInOtherCurrentLiabilities":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  19.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in current liabilities classified as other.",
                            "label":  "Increase (Decrease) in Other Current Liabilities",
                            "terseLabel":  "Other current liabilities"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInOtherCurrentLiabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInOtherOperatingAssets":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  14.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in operating assets classified as other.",
                            "label":  "Increase (Decrease) in Other Operating Assets",
                            "negatedLabel":  "Other assets"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInOtherOperatingAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInOtherOperatingLiabilities":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  21.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in operating liabilities classified as other.",
                            "label":  "Increase (Decrease) in Other Operating Liabilities",
                            "terseLabel":  "Other liabilities"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInOtherOperatingLiabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInOtherReceivables":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  13.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in receivables classified as other.",
                            "label":  "Increase (Decrease) in Other Receivables",
                            "negatedLabel":  "Retainage receivable"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInOtherReceivables",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  11.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in prepaid expenses, and assets classified as other.",
                            "label":  "Increase (Decrease) in Prepaid Expense and Other Assets",
                            "negatedLabel":  "Prepaid expenses and other current assets"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInRetainagePayable":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  20.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The increase (decrease) during the reporting period in retainage obligations due by the reporting entity that are payable within one year (or one business cycle).",
                            "label":  "Increase (Decrease) in Retainage Payable",
                            "terseLabel":  "Retainage payable"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInRetainagePayable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInStockholdersEquityRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Increase (Decrease) in Stockholders' Equity [Roll Forward]",
                            "terseLabel":  "Increase (decrease) in stockholders' equity"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInStockholdersEquityRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements":  {
                "auth_ref":  [
                    "r134",
                    "r139"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
                        "weight":  1.0
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.",
                            "label":  "Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements",
                            "terseLabel":  "Dilutive securities"
                            }
                        }
                    },
                "localname":  "IncrementalCommonSharesAttributableToShareBasedPaymentArrangements",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_IntangibleAssetsDisclosureTextBlock":  {
                "auth_ref":  [
                    "r234"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for all or part of the information related to intangible assets.",
                            "label":  "Intangible Assets Disclosure [Text Block]",
                            "terseLabel":  "Intangible Assets"
                            }
                        }
                    },
                "localname":  "IntangibleAssetsDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssets"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_IntangibleAssetsNetExcludingGoodwill":  {
                "auth_ref":  [
                    "r223",
                    "r227"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        },
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.",
                            "label":  "Intangible Assets, Net (Excluding Goodwill)",
                            "terseLabel":  "Acquired intangibles, net",
                            "totalLabel":  "Intangible assets, net"
                            }
                        }
                    },
                "localname":  "IntangibleAssetsNetExcludingGoodwill",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets",
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IntangibleAssetsNetExcludingGoodwillAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Intangible Assets, Net (Excluding Goodwill) [Abstract]",
                            "terseLabel":  "Summary of acquired intangible assets"
                            }
                        }
                    },
                "localname":  "IntangibleAssetsNetExcludingGoodwillAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_InterestIncomeExpenseNet":  {
                "auth_ref":  [
                    "r489"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The net amount of operating interest income (expense).",
                            "label":  "Interest Income (Expense), Net",
                            "negatedLabel":  "Interest and related financing fees, net"
                            }
                        }
                    },
                "localname":  "InterestIncomeExpenseNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_InvestmentPolicyTextBlock":  {
                "auth_ref":  [
                    "r194"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for investment in financial asset.",
                            "label":  "Investment, Policy [Policy Text Block]",
                            "terseLabel":  "Investments"
                            }
                        }
                    },
                "localname":  "InvestmentPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_InvestmentTableTextBlock":  {
                "auth_ref":  [
                    "r191",
                    "r192",
                    "r195",
                    "r196"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of investment.",
                            "label":  "Investment [Table Text Block]",
                            "terseLabel":  "Schedule of the Company's cost-basis investments"
                            }
                        }
                    },
                "localname":  "InvestmentTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_LeaseholdImprovementsMember":  {
                "auth_ref":  [
                    "r236"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Additions or improvements to assets held under a lease arrangement.",
                            "label":  "Leasehold Improvements [Member]",
                            "terseLabel":  "Leasehold improvements"
                            }
                        }
                    },
                "localname":  "LeaseholdImprovementsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LeasesOfLesseeDisclosureTextBlock":  {
                "auth_ref":  [
                    "r433"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.",
                            "label":  "Leases of Lessee Disclosure [Text Block]",
                            "terseLabel":  "Operating Leases"
                            }
                        }
                    },
                "localname":  "LeasesOfLesseeDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeases"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_LeasesOperatingAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Leases, Operating [Abstract]"
                            }
                        }
                    },
                "localname":  "LeasesOperatingAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LesseeLeaseDescriptionLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Lessee, Lease, Description [Line Items]",
                            "terseLabel":  "Lessee, Lease, Description [Line Items]"
                            }
                        }
                    },
                "localname":  "LesseeLeaseDescriptionLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LesseeLeaseDescriptionTable":  {
                "auth_ref":  [
                    "r439"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about lessee's leases.",
                            "label":  "Lessee, Lease, Description [Table]",
                            "terseLabel":  "Lessee, Lease, Description [Table]"
                            }
                        }
                    },
                "localname":  "LesseeLeaseDescriptionTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue":  {
                "auth_ref":  [
                    "r446"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/OperatingLeasesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.hillintl.com/role/OperatingLeasesDetailsCalc2":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due",
                            "totalLabel":  "Total minimum lease payments"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive":  {
                "auth_ref":  [
                    "r446"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/OperatingLeasesDetails":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due after Year Five",
                            "terseLabel":  "Thereafter"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive":  {
                "auth_ref":  [
                    "r446"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/OperatingLeasesDetails":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due Year Five",
                            "terseLabel":  "2024"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDueYearFive",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour":  {
                "auth_ref":  [
                    "r446"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/OperatingLeasesDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due Year Four",
                            "terseLabel":  "2023"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDueYearFour",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree":  {
                "auth_ref":  [
                    "r446"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/OperatingLeasesDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due Year Three",
                            "terseLabel":  "2022"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDueYearThree",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo":  {
                "auth_ref":  [
                    "r446"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/OperatingLeasesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due Year Two",
                            "terseLabel":  "2021"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDueYearTwo",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear":  {
                "auth_ref":  [
                    "r446"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/OperatingLeasesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year",
                            "terseLabel":  "2020"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount":  {
                "auth_ref":  [
                    "r446"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/OperatingLeasesDetailsCalc2":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.",
                            "label":  "Lessee, Operating Lease, Liability, Undiscounted Excess Amount",
                            "terseLabel":  "Less amount representing imputed interest"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityUndiscountedExcessAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseRenewalTerm":  {
                "auth_ref":  [
                    "r438"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
                            "label":  "Lessee, Operating Lease, Renewal Term",
                            "terseLabel":  "Lease renewal option period"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseRenewalTerm",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_LetterOfCreditMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A document typically issued by a financial institution which acts as a guarantee of payment to a beneficiary, or as the source of payment for a specific transaction (for example, wiring funds to a foreign exporter if and when specified merchandise is accepted pursuant to the terms of the letter of credit).",
                            "label":  "Letter of Credit [Member]",
                            "terseLabel":  "Letters of credit"
                            }
                        }
                    },
                "localname":  "LetterOfCreditMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_Liabilities":  {
                "auth_ref":  [
                    "r50"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LiabilitiesAndStockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized.  Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.",
                            "label":  "Liabilities",
                            "totalLabel":  "Total liabilities"
                            }
                        }
                    },
                "localname":  "Liabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LiabilitiesAndStockholdersEquity":  {
                "auth_ref":  [
                    "r36",
                    "r480",
                    "r500"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of liabilities and equity items, including the portion of equity attributable to noncontrolling interests, if any.",
                            "label":  "Liabilities and Equity",
                            "totalLabel":  "Total liabilities and stockholders\u2019 equity"
                            }
                        }
                    },
                "localname":  "LiabilitiesAndStockholdersEquity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LiabilitiesAndStockholdersEquityAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Liabilities and Equity [Abstract]",
                            "verboseLabel":  "Liabilities and Stockholders\u2019 Equity"
                            }
                        }
                    },
                "localname":  "LiabilitiesAndStockholdersEquityAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LiabilitiesCurrent":  {
                "auth_ref":  [
                    "r52"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.",
                            "label":  "Liabilities, Current",
                            "totalLabel":  "Total current liabilities"
                            }
                        }
                    },
                "localname":  "LiabilitiesCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LineOfCredit":  {
                "auth_ref":  [
                    "r26",
                    "r478",
                    "r494"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount.  Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line.  Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.",
                            "label":  "Long-term Line of Credit",
                            "terseLabel":  "Amounts outstanding"
                            }
                        }
                    },
                "localname":  "LineOfCredit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LineOfCreditFacilityAxis":  {
                "auth_ref":  [
                    "r48",
                    "r116"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by name of lender, which may be a single entity (for example, but not limited to, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit.",
                            "label":  "Lender Name [Axis]",
                            "terseLabel":  "Lender Name [Axis]"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LineOfCreditFacilityLenderDomain":  {
                "auth_ref":  [
                    "r48"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Identification of the lender, which may be a single entity (for example, a bank, pension fund, venture capital firm) or a group of entities that participate in the line of credit, including a letter of credit facility.",
                            "label":  "Line of Credit Facility, Lender [Domain]",
                            "terseLabel":  "Line of Credit Facility, Lender [Domain]"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityLenderDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity":  {
                "auth_ref":  [
                    "r48"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.",
                            "label":  "Line of Credit Facility, Maximum Borrowing Capacity",
                            "verboseLabel":  "Maximum borrowing capacity"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityMaximumBorrowingCapacity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity":  {
                "auth_ref":  [
                    "r48"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).",
                            "label":  "Line of Credit Facility, Remaining Borrowing Capacity",
                            "terseLabel":  "Available borrowing capacity",
                            "verboseLabel":  "Available borrowing capacity"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityRemainingBorrowingCapacity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.",
                            "label":  "Line of Credit Facility, Unused Capacity, Commitment Fee Percentage",
                            "terseLabel":  "Unused facility commitment fees percentage"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_LoansNotesTradeAndOtherReceivablesDisclosureTextBlock":  {
                "auth_ref":  [
                    "r189"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for claims held for amounts due a entity, excluding financing receivables.  Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables.  Includes disclosure for allowance for credit losses.",
                            "label":  "Loans, Notes, Trade and Other Receivables Disclosure [Text Block]",
                            "terseLabel":  "Accounts Receivable"
                            }
                        }
                    },
                "localname":  "LoansNotesTradeAndOtherReceivablesDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivable"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_LondonInterbankOfferedRateLIBORMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Interest rate at which a bank borrows funds from other banks in the London interbank market.",
                            "label":  "London Interbank Offered Rate (LIBOR) [Member]",
                            "terseLabel":  "British Bankers Association LIBOR Rate"
                            }
                        }
                    },
                "localname":  "LondonInterbankOfferedRateLIBORMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LongTermDebt":  {
                "auth_ref":  [
                    "r26",
                    "r265",
                    "r478",
                    "r497"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetailsCalc2":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt.  Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper.  Excludes capital lease obligations.",
                            "label":  "Long-term Debt",
                            "terseLabel":  "Long-term debt",
                            "totalLabel":  "Notes payable and long-term debt",
                            "verboseLabel":  "Long-term debt"
                            }
                        }
                    },
                "localname":  "LongTermDebt",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtCurrent":  {
                "auth_ref":  [
                    "r49"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetailsCalc2":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LongTermDebt",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current.  Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper.  Excludes capital lease obligations.",
                            "label":  "Long-term Debt, Current Maturities",
                            "totalLabel":  "Current maturities of notes payable and long-term debt"
                            }
                        }
                    },
                "localname":  "LongTermDebtCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive":  {
                "auth_ref":  [
                    "r124",
                    "r261"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails":  {
                        "order":  5.0,
                        "parentTag":  "hil_LongtermDebtMaturities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.  Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
                            "label":  "Long-term Debt, Maturities, Repayments of Principal after Year Five",
                            "terseLabel":  "Thereafter"
                            }
                        }
                    },
                "localname":  "LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":  {
                "auth_ref":  [
                    "r124",
                    "r261"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "hil_LongtermDebtMaturities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.  Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
                            "label":  "Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months",
                            "terseLabel":  "2020"
                            }
                        }
                    },
                "localname":  "LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":  {
                "auth_ref":  [
                    "r124",
                    "r261"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "hil_LongtermDebtMaturities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.  Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
                            "label":  "Long-term Debt, Maturities, Repayments of Principal in Year Five",
                            "terseLabel":  "2024"
                            }
                        }
                    },
                "localname":  "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":  {
                "auth_ref":  [
                    "r124",
                    "r261"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails":  {
                        "order":  6.0,
                        "parentTag":  "hil_LongtermDebtMaturities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.  Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
                            "label":  "Long-term Debt, Maturities, Repayments of Principal in Year Four",
                            "terseLabel":  "2023"
                            }
                        }
                    },
                "localname":  "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":  {
                "auth_ref":  [
                    "r124",
                    "r261"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails":  {
                        "order":  4.0,
                        "parentTag":  "hil_LongtermDebtMaturities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.  Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
                            "label":  "Long-term Debt, Maturities, Repayments of Principal in Year Three",
                            "terseLabel":  "2022"
                            }
                        }
                    },
                "localname":  "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":  {
                "auth_ref":  [
                    "r124",
                    "r261"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails":  {
                        "order":  3.0,
                        "parentTag":  "hil_LongtermDebtMaturities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.  Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.",
                            "label":  "Long-term Debt, Maturities, Repayments of Principal in Year Two",
                            "terseLabel":  "2021"
                            }
                        }
                    },
                "localname":  "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtMaturitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtNoncurrent":  {
                "auth_ref":  [
                    "r54"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetailsCalc2":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LongTermDebt",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer.  Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper.  Excludes capital lease obligations.",
                            "label":  "Long-term Debt, Excluding Current Maturities",
                            "terseLabel":  "Notes payable and long-term debt, net of current maturities"
                            }
                        }
                    },
                "localname":  "LongTermDebtNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtPercentageBearingFixedInterestRate":  {
                "auth_ref":  [
                    "r53"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.",
                            "label":  "Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate",
                            "terseLabel":  "Fixed interest rate"
                            }
                        }
                    },
                "localname":  "LongTermDebtPercentageBearingFixedInterestRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_LongTermDebtPercentageBearingVariableInterestRate":  {
                "auth_ref":  [
                    "r53"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.",
                            "label":  "Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate",
                            "terseLabel":  "Variable interest rate"
                            }
                        }
                    },
                "localname":  "LongTermDebtPercentageBearingVariableInterestRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_LongTermInvestments":  {
                "auth_ref":  [
                    "r41"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).",
                            "label":  "Long-term Investments",
                            "terseLabel":  "Investments"
                            }
                        }
                    },
                "localname":  "LongTermInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesInvestmentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermNotesPayable":  {
                "auth_ref":  [
                    "r54"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.",
                            "label":  "Notes Payable, Noncurrent",
                            "terseLabel":  "Notes payable and long-term debt, net of current maturities"
                            }
                        }
                    },
                "localname":  "LongTermNotesPayable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongtermDebtTypeAxis":  {
                "auth_ref":  [
                    "r54"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of long-term debt.",
                            "label":  "Long-term Debt, Type [Axis]",
                            "terseLabel":  "Long-term Debt, Type [Axis]"
                            }
                        }
                    },
                "localname":  "LongtermDebtTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LongtermDebtTypeDomain":  {
                "auth_ref":  [
                    "r54",
                    "r262"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Type of long-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing.  These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer.",
                            "label":  "Long-term Debt, Type [Domain]",
                            "terseLabel":  "Long-term Debt, Type [Domain]"
                            }
                        }
                    },
                "localname":  "LongtermDebtTypeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LossContingenciesByNatureOfContingencyAxis":  {
                "auth_ref":  [
                    "r250",
                    "r251",
                    "r252",
                    "r253",
                    "r254",
                    "r255",
                    "r256",
                    "r259",
                    "r260"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of existing condition, situation, or set of circumstances involving uncertainty as to possible loss to an enterprise that will ultimately be resolved when one or more future events occur or fail to occur.",
                            "label":  "Loss Contingency Nature [Axis]",
                            "terseLabel":  "Loss Contingency Nature [Axis]"
                            }
                        }
                    },
                "localname":  "LossContingenciesByNatureOfContingencyAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LossContingenciesLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Loss Contingencies [Line Items]",
                            "terseLabel":  "Loss Contingencies [Line Items]"
                            }
                        }
                    },
                "localname":  "LossContingenciesLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LossContingenciesTable":  {
                "auth_ref":  [
                    "r250",
                    "r251",
                    "r252",
                    "r253",
                    "r254",
                    "r255",
                    "r256",
                    "r259",
                    "r260"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Discloses the specific components (such as the nature, name, and date) of the loss contingency and gives an estimate of the possible loss or range of loss, or states that a reasonable estimate cannot be made.  Excludes environmental contingencies, warranties and unconditional purchase obligations.",
                            "label":  "Loss Contingencies [Table]",
                            "terseLabel":  "Loss Contingencies [Table]"
                            }
                        }
                    },
                "localname":  "LossContingenciesTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LossContingencyLossInPeriod":  {
                "auth_ref":  [
                    "r250"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_OperatingIncomeLoss",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.",
                            "label":  "Loss Contingency, Loss in Period",
                            "terseLabel":  "Less:  Loss on performance bond",
                            "verboseLabel":  "Loss on performance bond"
                            }
                        }
                    },
                "localname":  "LossContingencyLossInPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails",
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LossContingencyNatureDomain":  {
                "auth_ref":  [
                    "r250",
                    "r251",
                    "r252",
                    "r253",
                    "r254",
                    "r255",
                    "r256",
                    "r259",
                    "r260"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "An existing condition, situation, or set of circumstances involving uncertainty as to possible loss to an enterprise that will ultimately be resolved when one or more future events occur or fail to occur.  Resolution of the uncertainty may confirm the incurrence of a loss or impairment of an asset or the incurrence of a liability.",
                            "label":  "Loss Contingency, Nature [Domain]",
                            "terseLabel":  "Loss Contingency, Nature [Domain]"
                            }
                        }
                    },
                "localname":  "LossContingencyNatureDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_MiddleEastMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Region of Middle East.",
                            "label":  "Middle East [Member]",
                            "terseLabel":  "Middle East"
                            }
                        }
                    },
                "localname":  "MiddleEastMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationPropertyPlantAndEquipmentNetByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_MinorityInterest":  {
                "auth_ref":  [
                    "r64",
                    "r479",
                    "r499"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).",
                            "label":  "Stockholders' Equity Attributable to Noncontrolling Interest",
                            "terseLabel":  "Noncontrolling interests"
                            }
                        }
                    },
                "localname":  "MinorityInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_MinorityInterestDecreaseFromRedemptions":  {
                "auth_ref":  [
                    "r272",
                    "r405",
                    "r406"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).",
                            "label":  "Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests",
                            "negatedLabel":  "Acquisition of additional interest"
                            }
                        }
                    },
                "localname":  "MinorityInterestDecreaseFromRedemptions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_MovementInValuationAllowancesAndReservesRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]",
                            "terseLabel":  "Valuation and Qualifying Accounts"
                            }
                        }
                    },
                "localname":  "MovementInValuationAllowancesAndReservesRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccountsAllowanceForUncollectibleReceivablesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NatureOfOperations":  {
                "auth_ref":  [
                    "r142",
                    "r157"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings.  For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.",
                            "label":  "Nature of Operations [Text Block]",
                            "terseLabel":  "The Company"
                            }
                        }
                    },
                "localname":  "NatureOfOperations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/Company"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_NetCashProvidedByUsedInFinancingActivities":  {
                "auth_ref":  [
                    "r101"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow (outflow) from financing activities, including discontinued operations.  Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.",
                            "label":  "Net Cash Provided by (Used in) Financing Activities",
                            "totalLabel":  "Net cash (used in) provided by financing activities"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInFinancingActivities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Net Cash Provided by (Used in) Financing Activities [Abstract]",
                            "terseLabel":  "Cash flows from financing activities:"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInFinancingActivitiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NetCashProvidedByUsedInInvestingActivities":  {
                "auth_ref":  [
                    "r101"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow (outflow) from investing activities, including discontinued operations.  Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.",
                            "label":  "Net Cash Provided by (Used in) Investing Activities",
                            "totalLabel":  "Net cash used in investing activities"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInInvestingActivities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract]",
                            "terseLabel":  "Cash flows from investing activities:"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInInvestingActivitiesContinuingOperationsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NetCashProvidedByUsedInOperatingActivities":  {
                "auth_ref":  [
                    "r101",
                    "r103",
                    "r106"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
                        "weight":  1.0
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow (outflow) from operating activities, including discontinued operations.  Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.",
                            "label":  "Net Cash Provided by (Used in) Operating Activities",
                            "totalLabel":  "Net cash provided by (used in) operating activities"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInOperatingActivities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations":  {
                "auth_ref":  [
                    "r101",
                    "r103",
                    "r106"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow (outflow) from operating activities, excluding discontinued operations.  Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.",
                            "label":  "Net Cash Provided by (Used in) Operating Activities, Continuing Operations",
                            "totalLabel":  "Net cash provided by (used in) continuing operations"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract]",
                            "terseLabel":  "Cash flows from operating activities:"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInOperatingActivitiesContinuingOperationsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NetIncomeLoss":  {
                "auth_ref":  [
                    "r72",
                    "r75",
                    "r85",
                    "r106",
                    "r139",
                    "r487",
                    "r507"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.",
                            "label":  "Net Income (Loss) Attributable to Parent",
                            "totalLabel":  "Net income (loss) attributable to Hill International, Inc."
                            }
                        }
                    },
                "localname":  "NetIncomeLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetIncomeLossAttributableToNoncontrollingInterest":  {
                "auth_ref":  [
                    "r72",
                    "r75",
                    "r408",
                    "r412"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetIncomeLoss",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of Net Income (Loss) attributable to noncontrolling interest.",
                            "label":  "Net Income (Loss) Attributable to Noncontrolling Interest",
                            "terseLabel":  "Less: net income - noncontrolling interests"
                            }
                        }
                    },
                "localname":  "NetIncomeLossAttributableToNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "New Accounting Pronouncements or Change in Accounting Principle [Line Items]",
                            "terseLabel":  "New Accounting Pronouncements or Change in Accounting Principle [Line Items]"
                            }
                        }
                    },
                "localname":  "NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesAccountingPronouncementsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable":  {
                "auth_ref":  [
                    "r128",
                    "r130"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Summarization of the changes in an accounting principle or a new accounting pronouncement, including the line items affected by the change and the financial effects of the change on those particular line items.",
                            "label":  "New Accounting Pronouncements or Change in Accounting Principle [Table]",
                            "terseLabel":  "New Accounting Pronouncements or Change in Accounting Principle [Table]"
                            }
                        }
                    },
                "localname":  "NewAccountingPronouncementsOrChangeInAccountingPrincipleTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesAccountingPronouncementsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy pertaining to new accounting pronouncements that may impact the entity's financial reporting.  Includes, but is not limited to, quantification of the expected or actual impact.",
                            "label":  "New Accounting Pronouncements, Policy [Policy Text Block]",
                            "terseLabel":  "New and Recently Adopted Accounting Pronouncements"
                            }
                        }
                    },
                "localname":  "NewAccountingPronouncementsPolicyPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_NoncontrollingInterestMember":  {
                "auth_ref":  [
                    "r399"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "This element represents that portion of equity (net assets) in a subsidiary not attributable, directly or indirectly, to the parent.  A noncontrolling interest is sometimes called a minority interest.",
                            "label":  "Noncontrolling Interest [Member]",
                            "terseLabel":  "Non-controlling Interests"
                            }
                        }
                    },
                "localname":  "NoncontrollingInterestMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_NotesPayableCurrent":  {
                "auth_ref":  [
                    "r49"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LongTermDebtCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable due within one year or the operating cycle if longer.",
                            "label":  "Notes Payable, Current",
                            "verboseLabel":  "Current portion of notes payable"
                            }
                        }
                    },
                "localname":  "NotesPayableCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NotesPayableOtherPayablesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A written promise to pay a note to a third party.",
                            "label":  "Notes Payable, Other Payables [Member]",
                            "verboseLabel":  "Other financing arrangements"
                            }
                        }
                    },
                "localname":  "NotesPayableOtherPayablesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtOtherFinancingArrangementsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_NumberOfOperatingSegments":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of operating segments.  An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available.  An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.",
                            "label":  "Number of Operating Segments",
                            "terseLabel":  "Number of operating segments"
                            }
                        }
                    },
                "localname":  "NumberOfOperatingSegments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsNarrativeDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "us-gaap_OperatingIncomeLoss":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The net result for the period of deducting operating expenses from operating revenues.",
                            "label":  "Operating Income (Loss)",
                            "terseLabel":  "Operating profit (loss)",
                            "totalLabel":  "Operating profit (loss)"
                            }
                        }
                    },
                "localname":  "OperatingIncomeLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseCost":  {
                "auth_ref":  [
                    "r440",
                    "r447"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term.  Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.",
                            "label":  "Operating Lease, Cost",
                            "terseLabel":  "Rent expense"
                            }
                        }
                    },
                "localname":  "OperatingLeaseCost",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseLiability":  {
                "auth_ref":  [
                    "r436"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/OperatingLeasesDetailsCalc2":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Present value of lessee's discounted obligation for lease payments from operating lease.",
                            "label":  "Operating Lease, Liability",
                            "terseLabel":  "Present value of lease obligations",
                            "verboseLabel":  "Operating lease liabilities"
                            }
                        }
                    },
                "localname":  "OperatingLeaseLiability",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesAccountingPronouncementsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseLiabilityCurrent":  {
                "auth_ref":  [
                    "r436"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_LiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.",
                            "label":  "Operating Lease, Liability, Current",
                            "terseLabel":  "Current portion of operating lease liabilities"
                            }
                        }
                    },
                "localname":  "OperatingLeaseLiabilityCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseLiabilityNoncurrent":  {
                "auth_ref":  [
                    "r436"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.",
                            "label":  "Operating Lease, Liability, Noncurrent",
                            "terseLabel":  "Non-current operating lease liabilities"
                            }
                        }
                    },
                "localname":  "OperatingLeaseLiabilityNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeasePayments":  {
                "auth_ref":  [
                    "r437",
                    "r442"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.",
                            "label":  "Operating Lease, Payments",
                            "terseLabel":  "Cash paid for amounts included in the measurement of lease liabilities"
                            }
                        }
                    },
                "localname":  "OperatingLeasePayments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseRightOfUseAsset":  {
                "auth_ref":  [
                    "r435"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  10.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's right to use underlying asset under operating lease.",
                            "label":  "Operating Lease, Right-of-Use Asset",
                            "terseLabel":  "Operating lease right-of-use assets",
                            "verboseLabel":  "Operating lease right of use asset"
                            }
                        }
                    },
                "localname":  "OperatingLeaseRightOfUseAsset",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesAccountingPronouncementsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent":  {
                "auth_ref":  [
                    "r445",
                    "r447"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average discount rate for operating lease calculated at point in time.",
                            "label":  "Operating Lease, Weighted Average Discount Rate, Percent",
                            "terseLabel":  "Weighted average discount rate"
                            }
                        }
                    },
                "localname":  "OperatingLeaseWeightedAverageDiscountRatePercent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1":  {
                "auth_ref":  [
                    "r444",
                    "r447"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
                            "label":  "Operating Lease, Weighted Average Remaining Lease Term",
                            "terseLabel":  "Weighted average remaining lease term (years)"
                            }
                        }
                    },
                "localname":  "OperatingLeaseWeightedAverageRemainingLeaseTerm1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]",
                            "terseLabel":  "Total Operating Lease Payments"
                            }
                        }
                    },
                "localname":  "OperatingLeasesFutureMinimumPaymentsDueAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OperatingLeasesRentExpenseNet":  {
                "auth_ref":  [
                    "r431"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.",
                            "label":  "Operating Leases, Rent Expense, Net",
                            "terseLabel":  "Rent expense"
                            }
                        }
                    },
                "localname":  "OperatingLeasesRentExpenseNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLossCarryforwards":  {
                "auth_ref":  [
                    "r376"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.",
                            "label":  "Operating Loss Carryforwards",
                            "terseLabel":  "Net operating loss carryforwards"
                            }
                        }
                    },
                "localname":  "OperatingLossCarryforwards",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLossCarryforwardsLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Operating Loss Carryforwards [Line Items]",
                            "terseLabel":  "Operating loss carryforwards"
                            }
                        }
                    },
                "localname":  "OperatingLossCarryforwardsLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OperatingLossCarryforwardsTable":  {
                "auth_ref":  [
                    "r378"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule reflecting pertinent information, such as tax authority, amounts, and expiration dates, of net operating loss carryforwards, including an assessment of the likelihood of utilization.",
                            "label":  "Operating Loss Carryforwards [Table]",
                            "terseLabel":  "Operating Loss Carryforwards [Table]"
                            }
                        }
                    },
                "localname":  "OperatingLossCarryforwardsTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OperatingLossCarryforwardsValuationAllowance":  {
                "auth_ref":  [
                    "r353",
                    "r373",
                    "r377"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The portion of the valuation allowance pertaining to the deferred tax asset representing potential future taxable deductions from net operating loss carryforwards for which it is more likely than not that a tax benefit will not be realized.",
                            "label":  "Operating Loss Carryforwards, Valuation Allowance",
                            "terseLabel":  "Valuation allowance related to operating loss carryforwards"
                            }
                        }
                    },
                "localname":  "OperatingLossCarryforwardsValuationAllowance",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingSegmentsMember":  {
                "auth_ref":  [
                    "r160",
                    "r169"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Identifies components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity.",
                            "label":  "Operating Segments [Member]",
                            "terseLabel":  "Operating segment"
                            }
                        }
                    },
                "localname":  "OperatingSegmentsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationDepreciationAndAmortizationExpenseDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Organization, Consolidation and Presentation of Financial Statements [Abstract]"
                            }
                        }
                    },
                "localname":  "OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OtherAccruedLiabilitiesCurrent":  {
                "auth_ref":  [
                    "r17",
                    "r18",
                    "r19",
                    "r51"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.",
                            "label":  "Other Accrued Liabilities, Current",
                            "terseLabel":  "Other accrued expenses"
                            }
                        }
                    },
                "localname":  "OtherAccruedLiabilitiesCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherAssets":  {
                "auth_ref":  [
                    "r23",
                    "r474",
                    "r495"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  9.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of assets classified as other.",
                            "label":  "Other Assets",
                            "terseLabel":  "Other assets"
                            }
                        }
                    },
                "localname":  "OtherAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherAssetsMember":  {
                "auth_ref":  [
                    "r414",
                    "r416"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Primary financial statement caption encompassing other assets.",
                            "label":  "Other Assets [Member]",
                            "terseLabel":  "Other Assets"
                            }
                        }
                    },
                "localname":  "OtherAssetsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax":  {
                "auth_ref":  [
                    "r66",
                    "r424"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.",
                            "label":  "Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax",
                            "terseLabel":  "Foreign currency translation adjustments, net of tax"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossNetOfTax":  {
                "auth_ref":  [
                    "r73",
                    "r76",
                    "r79",
                    "r267"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax and reclassification adjustments of other comprehensive income (loss).",
                            "label":  "Other Comprehensive Income (Loss), Net of Tax",
                            "terseLabel":  "Other comprehensive earnings (loss)"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherInvestmentsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Primary financial statement caption encompassing other investments.",
                            "label":  "Other Investments [Member]",
                            "terseLabel":  "Other"
                            }
                        }
                    },
                "localname":  "OtherInvestmentsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesInvestmentsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_OtherLiabilitiesCurrent":  {
                "auth_ref":  [
                    "r16",
                    "r17",
                    "r51"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_LiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.",
                            "label":  "Other Liabilities, Current",
                            "terseLabel":  "Other current liabilities"
                            }
                        }
                    },
                "localname":  "OtherLiabilitiesCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherLiabilitiesMember":  {
                "auth_ref":  [
                    "r414",
                    "r416"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Primary financial statement caption encompassing other liabilities.",
                            "label":  "Other Liabilities [Member]",
                            "terseLabel":  "Other liabilities"
                            }
                        }
                    },
                "localname":  "OtherLiabilitiesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails",
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_OtherLiabilitiesNoncurrent":  {
                "auth_ref":  [
                    "r55"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.",
                            "label":  "Other Liabilities, Noncurrent",
                            "terseLabel":  "Other liabilities"
                            }
                        }
                    },
                "localname":  "OtherLiabilitiesNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherNonoperatingExpense":  {
                "auth_ref":  [
                    "r94"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of expense related to nonoperating activities, classified as other.",
                            "label":  "Other Nonoperating Expense",
                            "terseLabel":  "Other nonoperating expense"
                            }
                        }
                    },
                "localname":  "OtherNonoperatingExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesOtherIncomeNetDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherNonoperatingIncomeExpense":  {
                "auth_ref":  [
                    "r94"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of income (expense) related to nonoperating activities, classified as other.",
                            "label":  "Other Nonoperating Income (Expense)",
                            "terseLabel":  "Plus:  Other income, net",
                            "verboseLabel":  "Other income related to settlement of grant received"
                            }
                        }
                    },
                "localname":  "OtherNonoperatingIncomeExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesOtherIncomeNetDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ParentMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Portion of equity, or net assets, in the consolidated entity attributable, directly or indirectly, to the parent.  Excludes noncontrolling interests.",
                            "label":  "Parent [Member]",
                            "terseLabel":  "Hill Share of Stockholders' Equity"
                            }
                        }
                    },
                "localname":  "ParentMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_PayablesAndAccrualsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Payables and Accruals [Abstract]"
                            }
                        }
                    },
                "localname":  "PayablesAndAccrualsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_PaymentsToAcquirePropertyPlantAndEquipment":  {
                "auth_ref":  [
                    "r96"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.",
                            "label":  "Payments to Acquire Property, Plant, and Equipment",
                            "negatedLabel":  "Payments for purchase of property and equipment"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquirePropertyPlantAndEquipment",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock":  {
                "auth_ref":  [
                    "r301"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for pension and other postretirement benefits.",
                            "label":  "Pension and Other Postretirement Benefits Disclosure [Text Block]",
                            "terseLabel":  "Benefit Plans"
                            }
                        }
                    },
                "localname":  "PensionAndOtherPostretirementBenefitsDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlans"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_PerformanceGuaranteeMember":  {
                "auth_ref":  [
                    "r258"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "An agreement (contract) that requires the guarantor to make payments to a guaranteed party based on another entity's failure to perform under an obligating agreement.  This may include the issuance of a performance standby letter of credit which requires the guarantor to make payments if a specified party fails to perform under a nonfinancial contractual obligation.",
                            "label":  "Performance Guarantee [Member]",
                            "terseLabel":  "Performance Bond"
                            }
                        }
                    },
                "localname":  "PerformanceGuaranteeMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_PerformanceSharesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Share-based payment arrangement awarded for meeting performance target.",
                            "label":  "Performance Shares [Member]",
                            "terseLabel":  "Performance Shares"
                            }
                        }
                    },
                "localname":  "PerformanceSharesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_PlanNameAxis":  {
                "auth_ref":  [
                    "r305",
                    "r339"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by plan name for share-based payment arrangement.",
                            "label":  "Plan Name [Axis]",
                            "terseLabel":  "Plan Name [Axis]"
                            }
                        }
                    },
                "localname":  "PlanNameAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_PlanNameDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Plan name for share-based payment arrangement.",
                            "label":  "Plan Name [Domain]",
                            "terseLabel":  "Plan Name [Domain]"
                            }
                        }
                    },
                "localname":  "PlanNameDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_PreferredStockParOrStatedValuePerShare":  {
                "auth_ref":  [
                    "r29"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.",
                            "label":  "Preferred Stock, Par or Stated Value Per Share",
                            "terseLabel":  "Preferred stock, par value (in dollars per share)"
                            }
                        }
                    },
                "localname":  "PreferredStockParOrStatedValuePerShare",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_PreferredStockSharesAuthorized":  {
                "auth_ref":  [
                    "r29"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.",
                            "label":  "Preferred Stock, Shares Authorized",
                            "terseLabel":  "Preferred stock authorized (in shares)"
                            }
                        }
                    },
                "localname":  "PreferredStockSharesAuthorized",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_PreferredStockSharesIssued":  {
                "auth_ref":  [
                    "r29"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury).  May be all or portion of the number of preferred shares authorized.  Excludes preferred shares that are classified as debt.",
                            "label":  "Preferred Stock, Shares Issued",
                            "terseLabel":  "Preferred stock issued (in shares)"
                            }
                        }
                    },
                "localname":  "PreferredStockSharesIssued",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_PreferredStockValue":  {
                "auth_ref":  [
                    "r29"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Aggregate par or stated value of issued nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer).  This item includes treasury stock repurchased by the entity.  Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' equity.",
                            "label":  "Preferred Stock, Value, Issued",
                            "verboseLabel":  "Preferred stock, $0.0001 par value; 1,000 shares authorized, none issued"
                            }
                        }
                    },
                "localname":  "PreferredStockValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PrepaidExpenseAndOtherAssetsCurrent":  {
                "auth_ref":  [
                    "r13",
                    "r38",
                    "r39"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_AssetsCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.",
                            "label":  "Prepaid Expense and Other Assets, Current",
                            "terseLabel":  "Prepaid expenses and other current assets"
                            }
                        }
                    },
                "localname":  "PrepaidExpenseAndOtherAssetsCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PriorPeriodReclassificationAdjustment":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of a reclassification adjustment made to prior period financial statement amounts.",
                            "label":  "Prior Period Reclassification Adjustment",
                            "terseLabel":  "Prior period reclassification amount"
                            }
                        }
                    },
                "localname":  "PriorPeriodReclassificationAdjustment",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesReclassificationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PriorPeriodReclassificationAdjustmentDescription":  {
                "auth_ref":  [
                    "r0"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for reclassifications that affects the comparability of the financial statements.",
                            "label":  "Reclassification, Policy [Policy Text Block]",
                            "terseLabel":  "Reclassification"
                            }
                        }
                    },
                "localname":  "PriorPeriodReclassificationAdjustmentDescription",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ProceedsFromIssuanceOfMediumTermNotes":  {
                "auth_ref":  [
                    "r98"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash inflow from a debt funding received on a regular basis with maturities ranging from 5-10 years.",
                            "label":  "Proceeds from Issuance of Medium-term Notes",
                            "terseLabel":  "Proceeds from revolving loans"
                            }
                        }
                    },
                "localname":  "ProceedsFromIssuanceOfMediumTermNotes",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions":  {
                "auth_ref":  [
                    "r97",
                    "r340"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow from issuance of shares under share-based payment arrangement.  Includes, but is not limited to, option exercised.",
                            "label":  "Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised",
                            "terseLabel":  "Proceeds from exercise of stock options"
                            }
                        }
                    },
                "localname":  "ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromRepaymentsOfLinesOfCredit":  {
                "auth_ref":  [
                    "r123"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The net cash inflow or cash outflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with either short term or long term maturity that is collateralized (backed by pledge, mortgage or other lien in the entity's assets).",
                            "label":  "Proceeds from (Repayments of) Lines of Credit",
                            "verboseLabel":  "Proceeds from revolving loans"
                            }
                        }
                    },
                "localname":  "ProceedsFromRepaymentsOfLinesOfCredit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesReclassificationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromStockPlans":  {
                "auth_ref":  [
                    "r97"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash inflow associated with the amount received from the stock plan during the period.",
                            "label":  "Proceeds from Stock Plans",
                            "terseLabel":  "Proceeds from stock issued under employee stock purchase plan"
                            }
                        }
                    },
                "localname":  "ProceedsFromStockPlans",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProfitLoss":  {
                "auth_ref":  [
                    "r72",
                    "r75",
                    "r100",
                    "r163",
                    "r170",
                    "r402",
                    "r407",
                    "r409",
                    "r412",
                    "r413"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
                        "weight":  1.0
                        },
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetIncomeLoss",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.",
                            "label":  "Net Income (Loss), Including Portion Attributable to Noncontrolling Interest",
                            "terseLabel":  "Net (loss) earnings",
                            "totalLabel":  "Net income (loss)",
                            "verboseLabel":  "Net income (loss)"
                            }
                        }
                    },
                "localname":  "ProfitLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfComprehensiveIncomeLoss",
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Property, Plant and Equipment [Abstract]"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentByTypeAxis":  {
                "auth_ref":  [
                    "r44",
                    "r238"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of long-lived, physical assets used to produce goods and services and not intended for resale.",
                            "label":  "Property, Plant and Equipment, Type [Axis]",
                            "terseLabel":  "Property, Plant and Equipment, Type [Axis]"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentByTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentDisclosureTextBlock":  {
                "auth_ref":  [
                    "r241"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale.  Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures.",
                            "label":  "Property, Plant and Equipment Disclosure [Text Block]",
                            "terseLabel":  "Property and Equipment"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipment"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentGross":  {
                "auth_ref":  [
                    "r43",
                    "r236"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_PropertyPlantAndEquipmentNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale.  Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
                            "label":  "Property, Plant and Equipment, Gross",
                            "terseLabel":  "Property and equipment, gross"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Property, Plant and Equipment [Line Items]",
                            "terseLabel":  "Property and Equipment"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentNet":  {
                "auth_ref":  [
                    "r21",
                    "r22",
                    "r238",
                    "r501"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        },
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale.  Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.",
                            "label":  "Property, Plant and Equipment, Net",
                            "terseLabel":  "Property and equipment, net",
                            "totalLabel":  "Property and equipment, net",
                            "verboseLabel":  "Property, plant and equipment, net"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets",
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationPropertyPlantAndEquipmentNetByGeographicRegionDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentPolicyTextBlock":  {
                "auth_ref":  [
                    "r42",
                    "r111",
                    "r238"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for long-lived, physical assets used in the normal conduct of business and not intended for resale.  Includes, but is not limited to, basis of assets, depreciation and depletion methods used, including composite deprecation, estimated useful lives, capitalization policy, accounting treatment for costs incurred for repairs and maintenance, capitalized interest and the method it is calculated, disposals and impairments.",
                            "label":  "Property, Plant and Equipment, Policy [Policy Text Block]",
                            "terseLabel":  "Property and Equipment"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentTextBlock":  {
                "auth_ref":  [
                    "r21",
                    "r238"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale.  Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.",
                            "label":  "Property, Plant and Equipment [Table Text Block]",
                            "terseLabel":  "Schedule of components of property and equipment"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentTypeDomain":  {
                "auth_ref":  [
                    "r21",
                    "r236"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Listing of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.  Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.",
                            "label":  "Property, Plant and Equipment, Type [Domain]",
                            "terseLabel":  "Property, Plant and Equipment, Type [Domain]"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentTypeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentUsefulLife":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.  Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.",
                            "label":  "Property, Plant and Equipment, Useful Life",
                            "terseLabel":  "Estimated Useful Life"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentUsefulLife",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_ProvisionForDoubtfulAccounts":  {
                "auth_ref":  [
                    "r87",
                    "r200"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of expense (reversal of expense) for expected credit loss on accounts receivable.",
                            "label":  "Accounts Receivable, Credit Loss Expense (Reversal)",
                            "terseLabel":  "Recovery of bad debts"
                            }
                        }
                    },
                "localname":  "ProvisionForDoubtfulAccounts",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ReceivablesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Receivables [Abstract]"
                            }
                        }
                    },
                "localname":  "ReceivablesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable":  {
                "auth_ref":  [
                    "r165",
                    "r167"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations.  Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment.",
                            "label":  "Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table]",
                            "terseLabel":  "Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table]"
                            }
                        }
                    },
                "localname":  "ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock":  {
                "auth_ref":  [
                    "r165",
                    "r167"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the reconciliation of profit (loss) from reportable segments to the consolidated income (loss) before income tax expense (benefit) and discontinued operations.  Includes, but is not limited to, reconciliation after income tax if income tax is allocated to the reportable segment.",
                            "label":  "Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]",
                            "terseLabel":  "Schedule of Operating Profit (Loss)"
                            }
                        }
                    },
                "localname":  "ReconciliationOfOperatingProfitLossFromSegmentsToConsolidatedTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]",
                            "terseLabel":  "Changes in uncertain tax positions"
                            }
                        }
                    },
                "localname":  "ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RelatedPartyDomain":  {
                "auth_ref":  [
                    "r453"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Related parties include affiliates; other entities for which investments are accounted for by the equity method by the entity; trusts for benefit of employees; and principal owners, management, and members of immediate families.  It also may include other parties with which the entity may control or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests.",
                            "label":  "Related Party [Domain]",
                            "terseLabel":  "Related Party [Domain]"
                            }
                        }
                    },
                "localname":  "RelatedPartyDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_RelatedPartyTransactionsByRelatedPartyAxis":  {
                "auth_ref":  [
                    "r297",
                    "r449",
                    "r451",
                    "r460",
                    "r461",
                    "r462",
                    "r463",
                    "r464",
                    "r465",
                    "r466",
                    "r467",
                    "r468",
                    "r469",
                    "r470",
                    "r471"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of related party.  Related parties include, but not limited to, affiliates; other entities for which investments are accounted for by the equity method by the entity; trusts for benefit of employees; and principal owners, management, and members of immediate families.  It also may include other parties with which the entity may control or can significantly influence the management or operating policies of the other to an extent that one of the transacting parties might be prevented from fully pursuing its own separate interests.",
                            "label":  "Related Party [Axis]",
                            "terseLabel":  "Related Party [Axis]"
                            }
                        }
                    },
                "localname":  "RelatedPartyTransactionsByRelatedPartyAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RepaymentsOfLinesOfCredit":  {
                "auth_ref":  [
                    "r99",
                    "r117"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.",
                            "label":  "Repayments of Lines of Credit",
                            "negatedTerseLabel":  "Repayment of revolving loans"
                            }
                        }
                    },
                "localname":  "RepaymentsOfLinesOfCredit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RepaymentsOfMediumTermNotes":  {
                "auth_ref":  [
                    "r99"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflow to pay off borrowing used to receive debt funding on a regular basis with maturities ranging from 5-10 years.",
                            "label":  "Repayments of Medium-term Notes",
                            "negatedTerseLabel":  "Payments on term loans"
                            }
                        }
                    },
                "localname":  "RepaymentsOfMediumTermNotes",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue":  {
                "auth_ref":  [
                    "r11",
                    "r20",
                    "r107",
                    "r110"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_AssetsCurrent",
                        "weight":  1.0
                        },
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current.  Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.  Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
                            "label":  "Restricted Cash and Cash Equivalents, Current",
                            "terseLabel":  "Cash - restricted"
                            }
                        }
                    },
                "localname":  "RestrictedCashAndCashEquivalentsAtCarryingValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RestrictedCashAndCashEquivalentsNoncurrent":  {
                "auth_ref":  [
                    "r15",
                    "r23",
                    "r107",
                    "r110",
                    "r517"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        },
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent.  Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.  Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.",
                            "label":  "Restricted Cash and Cash Equivalents, Noncurrent",
                            "terseLabel":  "Cash - restricted, net of current portion"
                            }
                        }
                    },
                "localname":  "RestrictedCashAndCashEquivalentsNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesRestrictedCashAndConcentrationsOfCreditRiskDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RestrictedStockUnitsRSUMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met.",
                            "label":  "Restricted Stock Units (RSUs) [Member]",
                            "terseLabel":  "RSUs",
                            "verboseLabel":  "Restricted stock units"
                            }
                        }
                    },
                "localname":  "RestrictedStockUnitsRSUMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_RestructuringCostAndReserveLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Restructuring Cost and Reserve [Line Items]",
                            "terseLabel":  "Restructuring Cost and Reserve [Line Items]"
                            }
                        }
                    },
                "localname":  "RestructuringCostAndReserveLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesReclassificationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RestructuringReserve":  {
                "auth_ref":  [
                    "r242",
                    "r246"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.",
                            "label":  "Restructuring Reserve",
                            "terseLabel":  "Restructuring reserve"
                            }
                        }
                    },
                "localname":  "RestructuringReserve",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RetainedEarningsAccumulatedDeficit":  {
                "auth_ref":  [
                    "r33",
                    "r272",
                    "r498"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
                            "label":  "Retained Earnings (Accumulated Deficit)",
                            "terseLabel":  "Accumulated deficit"
                            }
                        }
                    },
                "localname":  "RetainedEarningsAccumulatedDeficit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RetainedEarningsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cumulative amount of the reporting entity's undistributed earnings or deficit.",
                            "label":  "Retained Earnings [Member]",
                            "terseLabel":  "Retained Earnings (Deficit)"
                            }
                        }
                    },
                "localname":  "RetainedEarningsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_RevenueFromContractWithCustomerAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Revenue from Contract with Customer [Abstract]"
                            }
                        }
                    },
                "localname":  "RevenueFromContractWithCustomerAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RevenueFromContractWithCustomerIncludingAssessedTax":  {
                "auth_ref":  [
                    "r281",
                    "r282"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_GrossProfit",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer.  Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.",
                            "label":  "Revenue from Contract with Customer, Including Assessed Tax",
                            "terseLabel":  "Total revenue"
                            }
                        }
                    },
                "localname":  "RevenueFromContractWithCustomerIncludingAssessedTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RevenueFromContractWithCustomerPolicyTextBlock":  {
                "auth_ref":  [
                    "r112",
                    "r289"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for revenue from contract with customer.",
                            "label":  "Revenue from Contract with Customer [Policy Text Block]",
                            "terseLabel":  "Deferred Revenue and Revenue Recognition"
                            }
                        }
                    },
                "localname":  "RevenueFromContractWithCustomerPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_RevenueFromContractWithCustomerTextBlock":  {
                "auth_ref":  [
                    "r289"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset.  Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer.  Excludes insurance and lease contracts.",
                            "label":  "Revenue from Contract with Customer [Text Block]",
                            "terseLabel":  "Revenue from Contracts with Clients"
                            }
                        }
                    },
                "localname":  "RevenueFromContractWithCustomerTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClients"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_RevenueRemainingPerformanceObligation":  {
                "auth_ref":  [
                    "r279"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of transaction price allocated to performance obligation that has not been recognized as revenue.",
                            "label":  "Revenue, Remaining Performance Obligation, Amount",
                            "terseLabel":  "Remaining performance obligations"
                            }
                        }
                    },
                "localname":  "RevenueRemainingPerformanceObligation",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]",
                            "terseLabel":  "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]"
                            }
                        }
                    },
                "localname":  "RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1":  {
                "auth_ref":  [
                    "r280"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
                            "label":  "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period",
                            "terseLabel":  "Remaining performance obligations, expected term"
                            }
                        }
                    },
                "localname":  "RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionPeriod1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsNarrativeDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis":  {
                "auth_ref":  [
                    "r280"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Start date of time band for expected timing of satisfaction of remaining performance obligation, in CCYY-MM-DD format.",
                            "label":  "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]",
                            "terseLabel":  "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]"
                            }
                        }
                    },
                "localname":  "RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionStartDateAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about expected timing for satisfying remaining performance obligation.",
                            "label":  "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]",
                            "terseLabel":  "Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]"
                            }
                        }
                    },
                "localname":  "RevenueRemainingPerformanceObligationExpectedTimingOfSatisfactionTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsNarrativeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RevenueRemainingPerformanceObligationPercentage":  {
                "auth_ref":  [
                    "r280"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.",
                            "label":  "Revenue, Remaining Performance Obligation, Percentage",
                            "terseLabel":  "Remaining performance obligations, percentage"
                            }
                        }
                    },
                "localname":  "RevenueRemainingPerformanceObligationPercentage",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsNarrativeDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_Revenues":  {
                "auth_ref":  [
                    "r82",
                    "r159",
                    "r160",
                    "r168"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process.  Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).",
                            "label":  "Revenues",
                            "terseLabel":  "Consulting fee revenue"
                            }
                        }
                    },
                "localname":  "Revenues",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Revenues from External Customers and Long-Lived Assets [Line Items]",
                            "terseLabel":  "Revenues from External Customers and Long-Lived Assets [Line Items]"
                            }
                        }
                    },
                "localname":  "RevenuesFromExternalCustomersAndLongLivedAssetsLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationPropertyPlantAndEquipmentNetByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RevolvingCreditFacilityMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Arrangement in which loan proceeds can continuously be obtained following repayments, but the total amount borrowed cannot exceed a specified maximum amount.",
                            "label":  "Revolving Credit Facility [Member]",
                            "terseLabel":  "Revolving credit facility"
                            }
                        }
                    },
                "localname":  "RevolvingCreditFacilityMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/LiquidityDetails",
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability":  {
                "auth_ref":  [
                    "r443",
                    "r447"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase in right-of-use asset obtained in exchange for operating lease liability.",
                            "label":  "Right-of-Use Asset Obtained in Exchange for Operating Lease Liability",
                            "terseLabel":  "Right-of-use assets obtained in exchange for operating lease liabilities"
                            }
                        }
                    },
                "localname":  "RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable":  {
                "auth_ref":  [
                    "r63"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule itemizing specific types of trade accounts and notes receivable, and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date.  Presentation is categorized by current, noncurrent and unclassified receivables.",
                            "label":  "Schedule of Accounts, Notes, Loans and Financing Receivable [Table]",
                            "terseLabel":  "Schedule of Accounts, Notes, Loans and Financing Receivable [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfAccountsNotesLoansAndFinancingReceivableTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock":  {
                "auth_ref":  [
                    "r63"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date.  Presentation is categorized by current, noncurrent and unclassified receivables.",
                            "label":  "Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]",
                            "terseLabel":  "Schedule of the components of accounts receivable"
                            }
                        }
                    },
                "localname":  "ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsReceivableTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the (a) carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business (accounts payable); (b) other payables; and (c) accrued liabilities.  Examples include taxes, interest, rent and utilities.  Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).  An alternative caption includes accrued expenses.",
                            "label":  "Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]",
                            "terseLabel":  "Schedule of components of accounts payable and accrued expenses"
                            }
                        }
                    },
                "localname":  "ScheduleOfAccountsPayableAndAccruedLiabilitiesTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable":  {
                "auth_ref":  [
                    "r138"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule for securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by Antidilutive Securities.",
                            "label":  "Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]",
                            "terseLabel":  "Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfCashAndCashEquivalentsTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the components of cash and cash equivalents.",
                            "label":  "Schedule of Cash and Cash Equivalents [Table Text Block]",
                            "terseLabel":  "Schedule of cash and cash equivalents"
                            }
                        }
                    },
                "localname":  "ScheduleOfCashAndCashEquivalentsTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock":  {
                "auth_ref":  [
                    "r384"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.",
                            "label":  "Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]",
                            "verboseLabel":  "Schedule of income tax expense (benefit)"
                            }
                        }
                    },
                "localname":  "ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfDebtInstrumentsTextBlock":  {
                "auth_ref":  [
                    "r54",
                    "r116",
                    "r268",
                    "r269",
                    "r270",
                    "r271",
                    "r426",
                    "r427",
                    "r429",
                    "r491"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation.  These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.",
                            "label":  "Schedule of Long-term Debt Instruments [Table Text Block]",
                            "terseLabel":  "Summary of outstanding debt obligations"
                            }
                        }
                    },
                "localname":  "ScheduleOfDebtInstrumentsTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable":  {
                "auth_ref":  [
                    "r290",
                    "r291",
                    "r292"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule, table or text reflecting pension and other postretirement benefit arrangements with individual employees, which are generally based on employment contracts between the entity and one or more selected officers or key employees, and which contain a promise by the employer to pay certain amounts at designated future dates, usually including a period after retirement, upon compliance with stipulated requirements.  This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee.  Disclosure also typically includes the amount of related compensation expense recognized during the reporting period and the carrying amount as of the balance sheet date of the related liability.",
                            "label":  "Schedule of Deferred Compensation Arrangement with Individual, Postretirement Benefits [Table]",
                            "terseLabel":  "Schedule of Deferred Compensation Arrangement with Individual, Postretirement Benefits [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfDeferredCompensationArrangementWithIndividualPostretirementBenefitsTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/BenefitPlansDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock":  {
                "auth_ref":  [
                    "r374"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.",
                            "label":  "Schedule of Deferred Tax Assets and Liabilities [Table Text Block]",
                            "terseLabel":  "Schedule of tax effect of temporary differences that give rise to deferred tax assets and deferred tax liabilities"
                            }
                        }
                    },
                "localname":  "ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock":  {
                "auth_ref":  [
                    "r139"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.",
                            "label":  "Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]",
                            "terseLabel":  "Schedule of reconciliation to net (loss) earnings used in the numerator for (loss) earnings per share from continuing operations"
                            }
                        }
                    },
                "localname":  "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock":  {
                "auth_ref":  [
                    "r360"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.",
                            "label":  "Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]",
                            "terseLabel":  "Schedule of the differences between income taxes based on the statutory U.S. federal income tax rate and the Company's effective income tax rate"
                            }
                        }
                    },
                "localname":  "ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock":  {
                "auth_ref":  [
                    "r304",
                    "r336",
                    "r342"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position.  Includes, but is not limited to, corresponding line item in financial statement.",
                            "label":  "Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]",
                            "terseLabel":  "Schedule of total share-based compensation expense"
                            }
                        }
                    },
                "localname":  "ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTextBlock":  {
                "auth_ref":  [
                    "r174"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the names of foreign countries in which material long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets are located, and amount of such long-lived assets located in that country or foreign geographic area.",
                            "label":  "Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]",
                            "terseLabel":  "Schedule of Property and Equipment, Net by Geographic Location"
                            }
                        }
                    },
                "localname":  "ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable":  {
                "auth_ref":  [
                    "r176"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure about the extent of the entity's reliance on its major customers.",
                            "label":  "Schedule of Revenue by Major Customers, by Reporting Segments [Table]",
                            "terseLabel":  "Schedule of Revenue by Major Customers, by Reporting Segments [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByClientTypeDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable":  {
                "auth_ref":  [
                    "r225",
                    "r228"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.",
                            "label":  "Schedule of Finite-Lived Intangible Assets [Table]",
                            "terseLabel":  "Schedule of Finite-Lived Intangible Assets [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfFiniteLivedIntangibleAssetsTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsSummaryOfAcquiredIntangibleAssetsDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesIntangibleAssetsAndGoodwillDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock":  {
                "auth_ref":  [
                    "r225",
                    "r228"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment.",
                            "label":  "Schedule of Finite-Lived Intangible Assets [Table Text Block]",
                            "terseLabel":  "Summary of acquired intangible assets"
                            }
                        }
                    },
                "localname":  "ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock":  {
                "auth_ref":  [
                    "r432"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date.",
                            "label":  "Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]",
                            "terseLabel":  "Schedule of approximate future minimum payments under leases"
                            }
                        }
                    },
                "localname":  "ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfGoodwillTextBlock":  {
                "auth_ref":  [
                    "r219",
                    "r221"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.",
                            "label":  "Schedule of Goodwill [Table Text Block]",
                            "terseLabel":  "Summary of changes in the Company's carrying value of goodwill"
                            }
                        }
                    },
                "localname":  "ScheduleOfGoodwillTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/GoodwillTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock":  {
                "auth_ref":  [
                    "r118"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of income before income tax between domestic and foreign jurisdictions.",
                            "label":  "Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]",
                            "terseLabel":  "Schedule of components of (loss) earnings before income taxes and the related income tax expense by the United States and foreign jurisdictions"
                            }
                        }
                    },
                "localname":  "ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfInvestmentsLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Schedule of Investments [Line Items]",
                            "terseLabel":  "Schedule of Investments [Line Items]"
                            }
                        }
                    },
                "localname":  "ScheduleOfInvestmentsLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesInvestmentsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfInvestmentsTable":  {
                "auth_ref":  [
                    "r515"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A container table for all schedule of investment items.  It ties in the \"Legal Entity [Axis]\" to all of its contained line items.",
                            "label":  "Schedule of Investments [Table]",
                            "terseLabel":  "Schedule of Investments [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfInvestmentsTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesInvestmentsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock":  {
                "auth_ref":  [
                    "r261"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented.",
                            "label":  "Schedule of Maturities of Long-term Debt [Table Text Block]",
                            "terseLabel":  "Schedule of contractual maturities of long term debt"
                            }
                        }
                    },
                "localname":  "ScheduleOfMaturitiesOfLongTermDebtTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfOtherShareBasedCompensationActivityTableTextBlock":  {
                "auth_ref":  [
                    "r318"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of activity for outstanding award under share-based payment arrangement excluding share and unit options and nonvested award.",
                            "label":  "Share-based Payment Arrangement, Outstanding Award, Activity, Excluding Option [Table Text Block]",
                            "terseLabel":  "Schedule of DSUs"
                            }
                        }
                    },
                "localname":  "ScheduleOfOtherShareBasedCompensationActivityTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfPropertyPlantAndEquipmentTable":  {
                "auth_ref":  [
                    "r44",
                    "r238"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about physical assets used in the normal conduct of business and not intended for resale.  Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation.",
                            "label":  "Property, Plant and Equipment [Table]",
                            "terseLabel":  "Property, Plant and Equipment [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfPropertyPlantAndEquipmentTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfRestructuringAndRelatedCostsTable":  {
                "auth_ref":  [
                    "r244",
                    "r245",
                    "r247"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Table presenting the description of the restructuring costs, such as the expected cost; the costs incurred during the period; the cumulative costs incurred as of the balance sheet date; the income statement caption within which the restructuring charges recognized for the period are included; and the amount of and periodic changes to an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost by type of restructuring.",
                            "label":  "Schedule of Restructuring and Related Costs [Table]",
                            "terseLabel":  "Schedule of Restructuring and Related Costs [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfRestructuringAndRelatedCostsTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesReclassificationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfRevenueFromExternalCustomersAttributedToForeignCountriesByGeographicAreaTextBlock":  {
                "auth_ref":  [
                    "r89",
                    "r173"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries.  An entity may also provide subtotals of geographic information about groups of countries.",
                            "label":  "Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]",
                            "terseLabel":  "Schedule of Revenue by Geographic Region"
                            }
                        }
                    },
                "localname":  "ScheduleOfRevenueFromExternalCustomersAttributedToForeignCountriesByGeographicAreaTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable":  {
                "auth_ref":  [
                    "r80",
                    "r82",
                    "r175"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule of material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material.  An entity may also provide subtotals of geographic information about groups of countries.",
                            "label":  "Schedule of Revenues from External Customers and Long-Lived Assets [Table]",
                            "terseLabel":  "Schedule of Revenues from External Customers and Long-Lived Assets [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationPropertyPlantAndEquipmentNetByGeographicRegionDetails",
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationRevenueByGeographicRegionDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable":  {
                "auth_ref":  [
                    "r158",
                    "r163",
                    "r164",
                    "r166",
                    "r219"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A table disclosing the profit or loss and total assets for each reportable segment of the entity.  An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.",
                            "label":  "Schedule of Segment Reporting Information, by Segment [Table]",
                            "terseLabel":  "Schedule of Segment Reporting Information, by Segment [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfSegmentReportingInformationBySegmentTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationDepreciationAndAmortizationExpenseDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock":  {
                "auth_ref":  [
                    "r158",
                    "r163",
                    "r164",
                    "r166",
                    "r219"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the profit or loss and total assets for each reportable segment.  An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.",
                            "label":  "Schedule of Segment Reporting Information, by Segment [Table Text Block]",
                            "terseLabel":  "Schedule of Depreciation and Amortization Expense"
                            }
                        }
                    },
                "localname":  "ScheduleOfSegmentReportingInformationBySegmentTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable":  {
                "auth_ref":  [
                    "r305",
                    "r339"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about share-based payment arrangement.",
                            "label":  "Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]",
                            "terseLabel":  "Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable":  {
                "auth_ref":  [
                    "r339"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Details comprising a table providing supplementary information on outstanding and exercisable share awards as of the balance sheet date which stratifies outstanding options by ranges of exercise prices.",
                            "label":  "Share-based Payment Arrangement, Option, Exercise Price Range [Table]",
                            "terseLabel":  "Share-based Payment Arrangement, Option, Exercise Price Range [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock":  {
                "auth_ref":  [
                    "r339"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.",
                            "label":  "Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]",
                            "terseLabel":  "Schedule of weighted average characteristics of outstanding stock options for various price ranges"
                            }
                        }
                    },
                "localname":  "ScheduleOfShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock":  {
                "auth_ref":  [
                    "r310",
                    "r324",
                    "r326"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure for stock option plans.  Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.",
                            "label":  "Share-based Payment Arrangement, Option, Activity [Table Text Block]",
                            "terseLabel":  "Summary of the Company's award activity and related information"
                            }
                        }
                    },
                "localname":  "ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock":  {
                "auth_ref":  [
                    "r330"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.",
                            "label":  "Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]",
                            "terseLabel":  "Schedule of assumptions used to estimate the fair value of options granted"
                            }
                        }
                    },
                "localname":  "ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock":  {
                "auth_ref":  [
                    "r367",
                    "r385"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the change in unrecognized tax benefits.",
                            "label":  "Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]",
                            "terseLabel":  "Schedule of changes to the Company's uncertain tax positions"
                            }
                        }
                    },
                "localname":  "ScheduleOfUnrecognizedTaxBenefitsRollForwardTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock":  {
                "auth_ref":  [
                    "r228"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets.",
                            "label":  "Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]",
                            "terseLabel":  "Summary of estimated amortization expense of intangible assets for the next five years"
                            }
                        }
                    },
                "localname":  "ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IntangibleAssetsTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_SchedulesOfConcentrationOfRiskByRiskFactorTextBlock":  {
                "auth_ref":  [
                    "r148",
                    "r151",
                    "r152",
                    "r153",
                    "r417",
                    "r419"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.",
                            "label":  "Schedules of Concentration of Risk, by Risk Factor [Table Text Block]",
                            "terseLabel":  "Schedule of number of the Company's clients which contributed 10% or more of revenue"
                            }
                        }
                    },
                "localname":  "SchedulesOfConcentrationOfRiskByRiskFactorTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_SecuredDebtMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Collateralized debt obligation backed by, for example, but not limited to, pledge, mortgage or other lien on the entity's assets.",
                            "label":  "Secured Debt [Member]",
                            "terseLabel":  "Secured Debt"
                            }
                        }
                    },
                "localname":  "SecuredDebtMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_SegmentDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Components of an entity that engage in business activities from which they may earn revenue and incur expenses, including transactions with other components of the same entity.",
                            "label":  "Segments [Domain]",
                            "terseLabel":  "Segments [Domain]"
                            }
                        }
                    },
                "localname":  "SegmentDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationDepreciationAndAmortizationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_SegmentReportingAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Segment Reporting [Abstract]"
                            }
                        }
                    },
                "localname":  "SegmentReportingAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SegmentReportingDisclosureTextBlock":  {
                "auth_ref":  [
                    "r177"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for reporting segments including data and tables.  Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.",
                            "label":  "Segment Reporting Disclosure [Text Block]",
                            "terseLabel":  "Segment and Related Information"
                            }
                        }
                    },
                "localname":  "SegmentReportingDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformation"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_SegmentReportingInformationLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Segment Reporting Information [Line Items]",
                            "terseLabel":  "Segment Reporting Information [Line Items]"
                            }
                        }
                    },
                "localname":  "SegmentReportingInformationLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationDepreciationAndAmortizationExpenseDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]",
                            "terseLabel":  "Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]"
                            }
                        }
                    },
                "localname":  "SegmentReportingReconcilingItemForOperatingProfitLossFromSegmentToConsolidatedLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationOperatingLossProfitDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SellingGeneralAndAdministrativeExpense":  {
                "auth_ref":  [
                    "r93",
                    "r212"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_OperatingIncomeLoss",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses.  Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products.  Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges.  General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.",
                            "label":  "Selling, General and Administrative Expense",
                            "terseLabel":  "Selling, general and administrative expenses"
                            }
                        }
                    },
                "localname":  "SellingGeneralAndAdministrativeExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_SellingGeneralAndAdministrativeExpensesMember":  {
                "auth_ref":  [
                    "r95"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Primary financial statement caption encompassing selling, general and administrative expense.",
                            "label":  "Selling, General and Administrative Expenses [Member]",
                            "terseLabel":  "Selling, general and administrative expense",
                            "verboseLabel":  "Portion charged to selling, general and administrative expense"
                            }
                        }
                    },
                "localname":  "SellingGeneralAndAdministrativeExpensesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/AccountsPayableAndAccruedExpensesDetails",
                    "http://www.hillintl.com/role/AccountsReceivableComponentsOfAccountsReceivableDetails",
                    "http://www.hillintl.com/role/BenefitPlansDetails",
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails",
                    "http://www.hillintl.com/role/PropertyAndEquipmentDetails",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesReclassificationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ShareBasedCompensation":  {
                "auth_ref":  [
                    "r104"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of noncash expense for share-based payment arrangement.",
                            "label":  "Share-based Payment Arrangement, Noncash Expense",
                            "terseLabel":  "Share-based compensation"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensation",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1":  {
                "auth_ref":  [
                    "r306"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.  Includes, but is not limited to, combination of market, performance or service condition.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period",
                            "terseLabel":  "Award vesting period"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod":  {
                "auth_ref":  [
                    "r316"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period",
                            "negatedTerseLabel":  "Forfeited (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue":  {
                "auth_ref":  [
                    "r322"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value",
                            "terseLabel":  "Forfeited (in dollars per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod":  {
                "auth_ref":  [
                    "r320"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period",
                            "terseLabel":  "Outstanding, granted (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue":  {
                "auth_ref":  [
                    "r320"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value",
                            "terseLabel":  "Outstanding, granted (in dollars per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber":  {
                "auth_ref":  [
                    "r319"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number",
                            "periodEndLabel":  "Unvested, end of period (in shares)",
                            "periodStartLabel":  "Unvested, beginning of period (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]",
                            "terseLabel":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue":  {
                "auth_ref":  [
                    "r319"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement.  Excludes share and unit options.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value",
                            "periodEndLabel":  "Unvested, end of period (in dollars per share)",
                            "periodStartLabel":  "Unvested, beginning of period (in dollars per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]",
                            "terseLabel":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod":  {
                "auth_ref":  [
                    "r321"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period",
                            "negatedTerseLabel":  "Vested (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue":  {
                "auth_ref":  [
                    "r321"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value",
                            "terseLabel":  "Vested (in dollars per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate":  {
                "auth_ref":  [
                    "r333"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate",
                            "terseLabel":  "Dividends (as a percent)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAssumptionsUsedDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate":  {
                "auth_ref":  [
                    "r332"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The estimated measure of the percentage by which a share price is expected to fluctuate during a period.  Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean.  The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period.  That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate",
                            "terseLabel":  "Volatility range (as a percent)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAssumptionsUsedDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate":  {
                "auth_ref":  [
                    "r334"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The risk-free interest rate assumption that is used in valuing an option on its own shares.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate",
                            "terseLabel":  "Weighted average risk-free interest rate (as a percent)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAssumptionsUsedDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate":  {
                "auth_ref":  [
                    "r332"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Rate of weighted-average expected volatility for award under share-based payment arrangement.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate",
                            "terseLabel":  "Weighted average volatility (as a percent)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAssumptionsUsedDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award [Line Items]",
                            "terseLabel":  "Share-based Compensation Arrangement by Share-based Payment Award [Line Items]"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized":  {
                "auth_ref":  [
                    "r307"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of shares authorized for issuance under share-based payment arrangement.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized",
                            "terseLabel":  "Number of shares covered under the plan"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]",
                            "terseLabel":  "Additional Disclosures"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosuresAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber":  {
                "auth_ref":  [
                    "r313"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number",
                            "periodEndLabel":  "Exercisable at the end of the period (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice":  {
                "auth_ref":  [
                    "r313"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price",
                            "terseLabel":  "Exercisable at the end of the period (in dollars per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod":  {
                "auth_ref":  [
                    "r317"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period",
                            "negatedLabel":  "Expired (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod":  {
                "auth_ref":  [
                    "r316"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period",
                            "negatedLabel":  "Forfeited (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod":  {
                "auth_ref":  [
                    "r314"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Net number of share options (or share units) granted during the period.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures",
                            "terseLabel":  "Grants in period (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Gross number of share options (or share units) granted during the period.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross",
                            "terseLabel":  "Granted (in shares)",
                            "verboseLabel":  "Stock options granted (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue":  {
                "auth_ref":  [
                    "r325"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value",
                            "terseLabel":  "Weighted average fair value at grant date (in dollars per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAssumptionsUsedDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue":  {
                "auth_ref":  [
                    "r339"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value",
                            "terseLabel":  "Outstanding, Aggregate Intrinsic Value"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber":  {
                "auth_ref":  [
                    "r312",
                    "r339"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of options outstanding, including both vested and non-vested options.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number",
                            "periodEndLabel":  "Outstanding at the end of the period (in shares)",
                            "periodStartLabel":  "Outstanding at the beginning of the period (in shares)",
                            "terseLabel":  "Outstanding (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]",
                            "terseLabel":  "Number"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice":  {
                "auth_ref":  [
                    "r311"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price",
                            "periodEndLabel":  "Outstanding at the end of the period (in dollars per share)",
                            "periodStartLabel":  "Outstanding at the beginning of the period (in dollars per share)",
                            "terseLabel":  "Weighted average exercise price of the outstanding options (in dollars per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]",
                            "terseLabel":  "Weighted Average Exercise Price"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue":  {
                "auth_ref":  [
                    "r328"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options.  Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value",
                            "terseLabel":  "Exercisable, Aggregate Intrinsic Value"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod":  {
                "auth_ref":  [
                    "r339"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of shares issued under share-based payment arrangement.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period",
                            "verboseLabel":  "Shares received from transaction (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain":  {
                "auth_ref":  [
                    "r303",
                    "r308"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Award under share-based payment arrangement.",
                            "label":  "Award Type [Domain]",
                            "terseLabel":  "Award Type [Domain]"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationSchedulesDetails",
                    "http://www.hillintl.com/role/ShareBasedCompensationShareBasedCompensationExpenseDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average price at which option holders acquired shares when converting their stock options into shares.",
                            "label":  "Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price",
                            "terseLabel":  "Exercised (in dollars per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails",
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.",
                            "label":  "Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price",
                            "terseLabel":  "Expired (in dollars per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.",
                            "label":  "Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price",
                            "terseLabel":  "Forfeited (in dollars per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.",
                            "label":  "Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price",
                            "terseLabel":  "Granted (in dollars per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationOptionAndIncentivePlansPolicy":  {
                "auth_ref":  [
                    "r111",
                    "r305",
                    "r309"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for award under share-based payment arrangement.  Includes, but is not limited to, methodology and assumption used in measuring cost.",
                            "label":  "Share-based Payment Arrangement [Policy Text Block]",
                            "terseLabel":  "Share-Based Compensation"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationOptionAndIncentivePlansPolicy",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis":  {
                "auth_ref":  [
                    "r329"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by range of option prices pertaining to options granted.",
                            "label":  "Exercise Price Range [Axis]",
                            "terseLabel":  "Exercise Price Range [Axis]"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain":  {
                "auth_ref":  [
                    "r335"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Supplementary information on outstanding and exercisable share awards as of the balance sheet date which stratifies outstanding options by ranges of exercise prices.",
                            "label":  "Exercise Price Range [Domain]",
                            "terseLabel":  "Exercise Price Range [Domain]"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]",
                            "terseLabel":  "Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions":  {
                "auth_ref":  [
                    "r323"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.",
                            "label":  "Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable",
                            "terseLabel":  "Number exercisable at the end of the period (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions":  {
                "auth_ref":  [
                    "r312"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.",
                            "label":  "Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding",
                            "terseLabel":  "Number outstanding at the end of the period (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_SharePrice":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Price of a single share of a number of saleable stocks of a company.",
                            "label":  "Share Price",
                            "terseLabel":  "Closing stock price (in dollars per share)"
                            }
                        }
                    },
                "localname":  "SharePrice",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage":  {
                "auth_ref":  [
                    "r306"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage of vesting of award under share-based payment arrangement.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage",
                            "terseLabel":  "Award vesting rights per annum"
                            }
                        }
                    },
                "localname":  "SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1":  {
                "auth_ref":  [
                    "r331",
                    "r341"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term",
                            "terseLabel":  "Average expected life"
                            }
                        }
                    },
                "localname":  "SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAssumptionsUsedDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1":  {
                "auth_ref":  [
                    "r339"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term",
                            "terseLabel":  "Exercisable, Weighted Average Remaining Contractual Life"
                            }
                        }
                    },
                "localname":  "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2":  {
                "auth_ref":  [
                    "r327"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term",
                            "terseLabel":  "Outstanding, Weighted Average Remaining Contractual Life"
                            }
                        }
                    },
                "localname":  "SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Purchase price of common stock expressed as a percentage of its fair value.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent",
                            "terseLabel":  "Purchase price of shares as a percentage of the fair market value on the date of purchase"
                            }
                        }
                    },
                "localname":  "SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2":  {
                "auth_ref":  [
                    "r328"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
                            "label":  "Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Remaining Contractual Term",
                            "terseLabel":  "Weighted average remaining contractual life, exercisable"
                            }
                        }
                    },
                "localname":  "SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1":  {
                "auth_ref":  [
                    "r312"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.",
                            "label":  "Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price",
                            "terseLabel":  "Exercise prices (in dollars per share)"
                            }
                        }
                    },
                "localname":  "SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2":  {
                "auth_ref":  [
                    "r327"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
                            "label":  "Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term",
                            "terseLabel":  "Weighted average remaining contractual life, outstanding"
                            }
                        }
                    },
                "localname":  "SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageRemainingContractualTerm2",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ShareBasedCompensationOutstandingAndExercisableDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations":  {
                "auth_ref":  [
                    "r119",
                    "r382",
                    "r386"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of state and local current and deferred income tax expense (benefit) attributable to continuing operations.",
                            "label":  "State and Local Income Tax Expense (Benefit), Continuing Operations",
                            "totalLabel":  "Total"
                            }
                        }
                    },
                "localname":  "StateAndLocalIncomeTaxExpenseBenefitContinuingOperations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperationsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract]",
                            "terseLabel":  "State and local"
                            }
                        }
                    },
                "localname":  "StateAndLocalIncomeTaxExpenseBenefitContinuingOperationsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesComponentsOfEarningsAndIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StateAndLocalJurisdictionMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Designated tax department of a state or local government entitled to levy and collect income taxes from the entity.",
                            "label":  "State and Local Jurisdiction [Member]",
                            "terseLabel":  "State"
                            }
                        }
                    },
                "localname":  "StateAndLocalJurisdictionMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_StatementBusinessSegmentsAxis":  {
                "auth_ref":  [
                    "r6",
                    "r163",
                    "r219",
                    "r240",
                    "r243",
                    "r248",
                    "r510"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by business segments.",
                            "label":  "Segments [Axis]",
                            "terseLabel":  "Segments [Axis]"
                            }
                        }
                    },
                "localname":  "StatementBusinessSegmentsAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SegmentAndRelatedInformationDepreciationAndAmortizationExpenseDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementEquityComponentsAxis":  {
                "auth_ref":  [
                    "r58",
                    "r267"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by component of equity.",
                            "label":  "Equity Components [Axis]",
                            "terseLabel":  "Equity Components [Axis]"
                            }
                        }
                    },
                "localname":  "StatementEquityComponentsAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails",
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line items represent financial concepts included in a table.  These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.",
                            "label":  "Statement [Line Items]",
                            "terseLabel":  "Statement [Line Items]"
                            }
                        }
                    },
                "localname":  "StatementLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementOfCashFlowsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Statement of Cash Flows [Abstract]"
                            }
                        }
                    },
                "localname":  "StatementOfCashFlowsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementOfFinancialPositionAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Statement of Financial Position [Abstract]"
                            }
                        }
                    },
                "localname":  "StatementOfFinancialPositionAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Statement of Comprehensive Income [Abstract]"
                            }
                        }
                    },
                "localname":  "StatementOfIncomeAndComprehensiveIncomeAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementOfStockholdersEquityAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Statement of Stockholders' Equity [Abstract]"
                            }
                        }
                    },
                "localname":  "StatementOfStockholdersEquityAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementTable":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule reflecting a Statement of Income, Statement of Cash Flows, Statement of Financial Position, Statement of Shareholders' Equity and Other Comprehensive Income, or other statement as needed.",
                            "label":  "Statement [Table]",
                            "terseLabel":  "Statement [Table]"
                            }
                        }
                    },
                "localname":  "StatementTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans":  {
                "auth_ref":  [
                    "r29",
                    "r30",
                    "r267",
                    "r272"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of shares issued during the period as a result of an employee stock purchase plan.",
                            "label":  "Stock Issued During Period, Shares, Employee Stock Purchase Plans",
                            "terseLabel":  "Shares issued under employee stock purchase plan (in shares)",
                            "verboseLabel":  "Shares issued under employee stock purchase plan (in shares)"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_StockIssuedDuringPeriodSharesIssuedForServices":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of shares issued in lieu of cash for services contributed to the entity.  Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.",
                            "label":  "Stock Issued During Period, Shares, Issued for Services",
                            "terseLabel":  "Shares issued to Board of Directors (in shares)"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodSharesIssuedForServices",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number, before forfeiture, of shares issued under share-based payment arrangement.  Excludes employee stock ownership plan (ESOP).",
                            "label":  "Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture",
                            "terseLabel":  "Share-based compensation expense (in shares)"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodSharesShareBasedCompensationGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised":  {
                "auth_ref":  [
                    "r29",
                    "r30",
                    "r267",
                    "r272",
                    "r315"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of share options (or share units) exercised during the current period.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period",
                            "negatedLabel":  "Exercised (in shares)",
                            "negatedTerseLabel":  "Exercise of stock options (in shares)"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodSharesStockOptionsExercised",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity",
                    "http://www.hillintl.com/role/ShareBasedCompensationAwardActivityDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan":  {
                "auth_ref":  [
                    "r29",
                    "r30",
                    "r267",
                    "r272"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.",
                            "label":  "Stock Issued During Period, Value, Employee Stock Purchase Plan",
                            "terseLabel":  "Shares issued under employee stock purchase plan",
                            "verboseLabel":  "Share-based compensation expense"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodValueEmployeeStockPurchasePlan",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity",
                    "http://www.hillintl.com/role/ShareBasedCompensationNarrativeDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StockIssuedDuringPeriodValueIssuedForServices":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Value of stock issued in lieu of cash for services contributed to the entity.  Value of the stock issued includes, but is not limited to, services contributed by vendors and founders.",
                            "label":  "Stock Issued During Period, Value, Issued for Services",
                            "terseLabel":  "Shares issued to Board of Directors"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodValueIssuedForServices",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised":  {
                "auth_ref":  [
                    "r58",
                    "r267",
                    "r272"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Value of stock issued as a result of the exercise of stock options.",
                            "label":  "Stock Issued During Period, Value, Stock Options Exercised",
                            "terseLabel":  "Exercise of stock options"
                            }
                        }
                    },
                "localname":  "StockIssuedDuringPeriodValueStockOptionsExercised",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StockholdersEquity":  {
                "auth_ref":  [
                    "r30",
                    "r34",
                    "r35",
                    "r188"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent.  The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest).  This excludes temporary equity and is sometimes called permanent equity.",
                            "label":  "Stockholders' Equity Attributable to Parent",
                            "totalLabel":  "Hill International, Inc. share of equity"
                            }
                        }
                    },
                "localname":  "StockholdersEquity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest":  {
                "auth_ref":  [
                    "r399",
                    "r400",
                    "r411"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LiabilitiesAndStockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests.  Amount excludes temporary equity.  Alternate caption for the concept is permanent equity.",
                            "label":  "Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest",
                            "periodEndLabel":  "Balance at end of period",
                            "periodStartLabel":  "Balance at beginning of period",
                            "totalLabel":  "Total equity"
                            }
                        }
                    },
                "localname":  "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets",
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]",
                            "terseLabel":  "Stockholders\u2019 equity:"
                            }
                        }
                    },
                "localname":  "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StockholdersEquityNoteAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Stockholders' Equity Note [Abstract]"
                            }
                        }
                    },
                "localname":  "StockholdersEquityNoteAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StockholdersEquityNoteDisclosureTextBlock":  {
                "auth_ref":  [
                    "r275"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income.  Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.",
                            "label":  "Stockholders' Equity Note Disclosure [Text Block]",
                            "terseLabel":  "Stockholders' Equity"
                            }
                        }
                    },
                "localname":  "StockholdersEquityNoteDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/StockholdersEquity"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_SubleaseIncome":  {
                "auth_ref":  [
                    "r441",
                    "r447"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of sublease income excluding finance and operating lease expense.",
                            "label":  "Sublease Income",
                            "terseLabel":  "Sublease income"
                            }
                        }
                    },
                "localname":  "SubleaseIncome",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/OperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_SubsequentEventLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Detail information of subsequent event by type.  User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.",
                            "label":  "Subsequent Event [Line Items]",
                            "terseLabel":  "Subsequent Event [Line Items]"
                            }
                        }
                    },
                "localname":  "SubsequentEventLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SubsequentEventDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SubsequentEventMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Identifies event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
                            "label":  "Subsequent Event [Member]",
                            "terseLabel":  "Subsequent Event"
                            }
                        }
                    },
                "localname":  "SubsequentEventMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SubsequentEventDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_SubsequentEventTable":  {
                "auth_ref":  [
                    "r455"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Discloses pertinent information about one or more significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued.",
                            "label":  "Subsequent Event [Table]",
                            "terseLabel":  "Subsequent Event [Table]"
                            }
                        }
                    },
                "localname":  "SubsequentEventTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SubsequentEventDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SubsequentEventTypeAxis":  {
                "auth_ref":  [
                    "r455"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
                            "label":  "Subsequent Event Type [Axis]",
                            "terseLabel":  "Subsequent Event Type [Axis]"
                            }
                        }
                    },
                "localname":  "SubsequentEventTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SubsequentEventDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SubsequentEventTypeDomain":  {
                "auth_ref":  [
                    "r455"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Event that occurred after the balance sheet date but before financial statements are issued or available to be issued.",
                            "label":  "Subsequent Event Type [Domain]",
                            "terseLabel":  "Subsequent Event Type [Domain]"
                            }
                        }
                    },
                "localname":  "SubsequentEventTypeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SubsequentEventDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_SubsequentEventsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Subsequent Events [Abstract]"
                            }
                        }
                    },
                "localname":  "SubsequentEventsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SubsequentEventsTextBlock":  {
                "auth_ref":  [
                    "r456"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued.  Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.",
                            "label":  "Subsequent Events [Text Block]",
                            "terseLabel":  "Subsequent Event"
                            }
                        }
                    },
                "localname":  "SubsequentEventsTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SubsequentEvent"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_SummaryOfValuationAllowanceTextBlock":  {
                "auth_ref":  [
                    "r373"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance.",
                            "label":  "Summary of Valuation Allowance [Table Text Block]",
                            "terseLabel":  "Valuation allowance for deferred tax asset"
                            }
                        }
                    },
                "localname":  "SummaryOfValuationAllowanceTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions":  {
                "auth_ref":  [
                    "r348",
                    "r352"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) to previously recorded tax expense.  Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.",
                            "label":  "Tax Adjustments, Settlements, and Unusual Provisions",
                            "terseLabel":  "Tax liability expensed during period"
                            }
                        }
                    },
                "localname":  "TaxAdjustmentsSettlementsAndUnusualProvisions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/CommitmentsAndContingenciesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_TaxesPayableCurrent":  {
                "auth_ref":  [
                    "r49"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_LiabilitiesCurrent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes.  Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).",
                            "label":  "Taxes Payable, Current",
                            "terseLabel":  "Income taxes payable"
                            }
                        }
                    },
                "localname":  "TaxesPayableCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_TimeAndMaterialsContractMember":  {
                "auth_ref":  [
                    "r288"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Contract with customer in which amount of consideration is based on time and materials consumed.",
                            "label":  "Time-and-materials Contract [Member]",
                            "terseLabel":  "T&M"
                            }
                        }
                    },
                "localname":  "TimeAndMaterialsContractMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/RevenueFromContractsWithClientsDisaggregationOfRevenueDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_TradeAndOtherAccountsReceivablePolicy":  {
                "auth_ref":  [
                    "r181",
                    "r182",
                    "r184",
                    "r185",
                    "r187",
                    "r190"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for accounts receivable.",
                            "label":  "Accounts Receivable [Policy Text Block]",
                            "terseLabel":  "Allowance for Doubtful Accounts"
                            }
                        }
                    },
                "localname":  "TradeAndOtherAccountsReceivablePolicy",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain":  {
                "auth_ref":  [
                    "r457"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Instrument or contract that imposes a contractual obligation to deliver cash or another financial instrument or to exchange other financial instruments on potentially unfavorable terms and conveys a contractual right to receive cash or another financial instrument or to exchange other financial instruments on potentially favorable terms.",
                            "label":  "Financial Instruments [Domain]",
                            "terseLabel":  "Financial Instruments [Domain]"
                            }
                        }
                    },
                "localname":  "TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesInvestmentsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_TreasuryStockMember":  {
                "auth_ref":  [
                    "r57",
                    "r273"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Shares of an entity that have been repurchased by the entity.  This stock has no voting rights and receives no dividends.  Note that treasury stock may be recorded at its total cost or separately as par (or stated) value and additional paid in capital.  Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer.  Classified within temporary equity if redemption is outside the control of the issuer.",
                            "label":  "Treasury Stock [Member]",
                            "terseLabel":  "Treasury Stock",
                            "verboseLabel":  "Treasury Stock"
                            }
                        }
                    },
                "localname":  "TreasuryStockMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity",
                    "http://www.hillintl.com/role/StockholdersEquityDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_TreasuryStockShares":  {
                "auth_ref":  [
                    "r57",
                    "r273"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date.  This stock has no voting rights and receives no dividends.",
                            "label":  "Treasury Stock, Shares",
                            "periodEndLabel":  "Balance at end of period of treasury stock (in shares)",
                            "periodStartLabel":  "Balance at beginning of period of treasury stock (in shares)",
                            "terseLabel":  "Treasury stock (in shares)"
                            }
                        }
                    },
                "localname":  "TreasuryStockShares",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheetsParenthetical",
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfStockholdersEquity"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_TreasuryStockValue":  {
                "auth_ref":  [
                    "r57",
                    "r273",
                    "r274"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount allocated to treasury stock.  Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.",
                            "label":  "Treasury Stock, Value",
                            "negatedLabel":  "Treasury stock of 6,546 at December 31, 2019 and 2018"
                            }
                        }
                    },
                "localname":  "TreasuryStockValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_TypeOfAdoptionMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Adoption and early adoption of sources of change to generally accepted accounting principles (GAAP) in the United States.  The FASB released the FASB Accounting Standards Codification as the authoritative source of literature effective for interim and annual periods ending after September 15, 2009.  As part of the Codification process, the FASB issues Accounting Standards Updates to amend the Codification but otherwise the Accounting Standards Updates are not authoritative in their own right.  All previous accounting standards (such as FASB Statements of Financial Accounting Standards, FASB Interpretations, FASB Staff Positions, Emerging Issues Task Force Consensuses, other pronouncements of the FASB or other designated bodies, or other forms of GAAP are considered accounting pronouncements) were superseded upon the adoption of the Codification.  For an interim period, references to the superseded standards are included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.",
                            "label":  "Type of Adoption [Domain]",
                            "terseLabel":  "Type of Adoption [Domain]"
                            }
                        }
                    },
                "localname":  "TypeOfAdoptionMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesAccountingPronouncementsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_UnamortizedDebtIssuanceExpense":  {
                "auth_ref":  [
                    "r45"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues.  This does not include the amounts capitalized as part of the cost of the utility plant or asset.",
                            "label":  "Unamortized Debt Issuance Expense",
                            "terseLabel":  "Unamortized balances of expenses and fees"
                            }
                        }
                    },
                "localname":  "UnamortizedDebtIssuanceExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_UnrecognizedTaxBenefits":  {
                "auth_ref":  [
                    "r354",
                    "r364"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of unrecognized tax benefits.",
                            "label":  "Unrecognized Tax Benefits",
                            "periodEndLabel":  "Balance, end of year",
                            "periodStartLabel":  "Balance, beginning of year"
                            }
                        }
                    },
                "localname":  "UnrecognizedTaxBenefits",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions":  {
                "auth_ref":  [
                    "r365"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.",
                            "label":  "Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions",
                            "negatedLabel":  "Reductions based on tax positions related to prior years"
                            }
                        }
                    },
                "localname":  "UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities":  {
                "auth_ref":  [
                    "r366"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.",
                            "label":  "Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities",
                            "negatedLabel":  "Reduction due to settlements with taxing authorities"
                            }
                        }
                    },
                "localname":  "UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued":  {
                "auth_ref":  [
                    "r362"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.",
                            "label":  "Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued",
                            "verboseLabel":  "Accrued interest and penalties related to accrued interest and penalties related to unrecognized tax benefits"
                            }
                        }
                    },
                "localname":  "UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions":  {
                "auth_ref":  [
                    "r365"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.",
                            "label":  "Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions",
                            "terseLabel":  "Additions based on tax positions related to prior years"
                            }
                        }
                    },
                "localname":  "UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesUncertainTaxPositionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_UnsecuredDebtMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt obligation not collateralized by pledge of, mortgage of or other lien on the entity's assets.",
                            "label":  "Unsecured Debt [Member]",
                            "terseLabel":  "Unsecured Debt"
                            }
                        }
                    },
                "localname":  "UnsecuredDebtMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtSummaryOfOutstandingDebtObligationsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_UseOfEstimates":  {
                "auth_ref":  [
                    "r143",
                    "r144",
                    "r146",
                    "r147",
                    "r154",
                    "r155",
                    "r156"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.",
                            "label":  "Use of Estimates, Policy [Policy Text Block]",
                            "terseLabel":  "Use of Estimates and Assumptions"
                            }
                        }
                    },
                "localname":  "UseOfEstimates",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember":  {
                "auth_ref":  [
                    "r125"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Valuation allowance of deferred tax asset attributable to deductible temporary difference and carryforward.",
                            "label":  "SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]",
                            "terseLabel":  "SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset"
                            }
                        }
                    },
                "localname":  "ValuationAllowanceOfDeferredTaxAssetsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesValuationAllowanceForDeferredTaxAssetDetails",
                    "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccountsAllowanceForUncollectibleReceivablesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ValuationAllowancesAndReservesBalance":  {
                "auth_ref":  [
                    "r126"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of valuation and qualifying accounts and reserves.",
                            "label":  "SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount",
                            "periodEndLabel":  "Balance at End of Fiscal Year",
                            "periodStartLabel":  "Balance at Beginning of Fiscal Year"
                            }
                        }
                    },
                "localname":  "ValuationAllowancesAndReservesBalance",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesValuationAllowanceForDeferredTaxAssetDetails",
                    "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccountsAllowanceForUncollectibleReceivablesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense":  {
                "auth_ref":  [
                    "r126"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense.",
                            "label":  "SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense",
                            "terseLabel":  "Additions (Recoveries) Charged (Credited) to Earnings"
                            }
                        }
                    },
                "localname":  "ValuationAllowancesAndReservesChargedToCostAndExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesValuationAllowanceForDeferredTaxAssetDetails",
                    "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccountsAllowanceForUncollectibleReceivablesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ValuationAllowancesAndReservesDeductions":  {
                "auth_ref":  [
                    "r126"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of decrease in valuation and qualifying accounts and reserves.",
                            "label":  "SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction",
                            "negatedLabel":  "Deductions and Other Adjustments",
                            "negatedTerseLabel":  "Deductions and Other Adjustments"
                            }
                        }
                    },
                "localname":  "ValuationAllowancesAndReservesDeductions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesValuationAllowanceForDeferredTaxAssetDetails",
                    "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccountsAllowanceForUncollectibleReceivablesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ValuationAllowancesAndReservesDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Valuation and qualifying accounts and reserves.",
                            "label":  "SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]",
                            "terseLabel":  "SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain]"
                            }
                        }
                    },
                "localname":  "ValuationAllowancesAndReservesDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesValuationAllowanceForDeferredTaxAssetDetails",
                    "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccountsAllowanceForUncollectibleReceivablesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ValuationAllowancesAndReservesTypeAxis":  {
                "auth_ref":  [
                    "r126"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by valuation and qualifying accounts and reserves.",
                            "label":  "SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]",
                            "terseLabel":  "SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis]"
                            }
                        }
                    },
                "localname":  "ValuationAllowancesAndReservesTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/IncomeTaxesValuationAllowanceForDeferredTaxAssetDetails",
                    "http://www.hillintl.com/role/ScheduleIiValuationAndQualifyingAccountsAllowanceForUncollectibleReceivablesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_VariableRateAxis":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of variable rate.",
                            "label":  "Variable Rate [Axis]",
                            "terseLabel":  "Variable Rate [Axis]"
                            }
                        }
                    },
                "localname":  "VariableRateAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_VariableRateDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Interest rate that fluctuates over time as a result of an underlying benchmark interest rate or index.",
                            "label":  "Variable Rate [Domain]",
                            "terseLabel":  "Variable Rate [Domain]"
                            }
                        }
                    },
                "localname":  "VariableRateDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/NotesPayableAndLongTermDebtTermLoanFacilitiesAndRevolvingCreditFacilitiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding":  {
                "auth_ref":  [
                    "r132",
                    "r137"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.",
                            "label":  "Weighted Average Number of Shares Outstanding, Diluted",
                            "terseLabel":  "Diluted weighted average common shares outstanding (in shares)",
                            "totalLabel":  "Diluted weighted average shares common outstanding (in shares)"
                            }
                        }
                    },
                "localname":  "WeightedAverageNumberOfDilutedSharesOutstanding",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic":  {
                "auth_ref":  [
                    "r131",
                    "r137"
                    ],
                "calculation":  {
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding",
                        "weight":  1.0
                        }
                    },
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.",
                            "label":  "Weighted Average Number of Shares Outstanding, Basic",
                            "terseLabel":  "Basic weighted average common shares outstanding"
                            }
                        }
                    },
                "localname":  "WeightedAverageNumberOfSharesOutstandingBasic",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.hillintl.com/role/ConsolidatedStatementsOfOperations",
                    "http://www.hillintl.com/role/SummaryOfSignificantAccountingPoliciesEarningsPerShareDetails"
                    ],
                "xbrltype":  "sharesItemType"
                }
            },
        "unitCount":  11
        }
    },
"std_ref":  {
    "r0":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=6359566&loc=d3e326-107755"
        },
    "r1":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=109222160&loc=d3e957-107759"
        },
    "r10":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "20",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=26872618&loc=d3e7436-122677"
        },
    "r100":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3000-108585"
        },
    "r101":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "24",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3521-108585"
        },
    "r102":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "25",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(f)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
        },
    "r103":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "25",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
        },
    "r104":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
        },
    "r105":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
        },
    "r106":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585"
        },
    "r107":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585"
        },
    "r108":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4273-108586"
        },
    "r109":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586"
        },
    "r11":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
        },
    "r110":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586"
        },
    "r111":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790"
        },
    "r112":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(e)",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=84158767&loc=d3e18823-107790"
        },
    "r113":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08(h)(1))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r114":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08(h)(2))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r115":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08(h))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r116":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08.(e),(f))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r117":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08.(f))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r118":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08.(h)(1)(i))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r119":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08.(h)(1))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r12":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
        },
    "r120":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08.(h)(2))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r121":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08.(h))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r122":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08.(k)(1))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r123":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.12-04(a))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690"
        },
    "r124":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.12-04.(a))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690"
        },
    "r125":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.12-09(ColumnA))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690"
        },
    "r126":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.12-09)",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690"
        },
    "r127":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/topic&trid=2122369"
        },
    "r128":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "250",
        "URI":  "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794"
        },
    "r129":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "250",
        "URI":  "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794"
        },
    "r13":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765"
        },
    "r130":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "250",
        "URI":  "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794"
        },
    "r131":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1448-109256"
        },
    "r132":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1505-109256"
        },
    "r133":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1252-109256"
        },
    "r134":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1500-109256"
        },
    "r135":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "60B",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=SL5780133-109256"
        },
    "r136":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117326831&loc=d3e1337-109256"
        },
    "r137":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
        },
    "r138":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
        },
    "r139":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257"
        },
    "r14":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6801-107765"
        },
    "r140":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257"
        },
    "r141":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "52",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/extlink&oid=117327953&loc=d3e4984-109258"
        },
    "r142":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
        },
    "r143":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
        },
    "r144":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
        },
    "r145":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592"
        },
    "r146":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6161-108592"
        },
    "r147":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6191-108592"
        },
    "r148":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592"
        },
    "r149":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "18",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592"
        },
    "r15":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765"
        },
    "r150":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "18",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592"
        },
    "r151":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "18",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592"
        },
    "r152":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592"
        },
    "r153":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "21",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6442-108592"
        },
    "r154":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6061-108592"
        },
    "r155":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6132-108592"
        },
    "r156":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/extlink&oid=99393423&loc=d3e6143-108592"
        },
    "r157":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "275",
        "URI":  "http://asc.fasb.org/topic&trid=2134479"
        },
    "r158":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "21",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599"
        },
    "r159":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "22",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
        },
    "r16":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6904-107765"
        },
    "r160":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "22",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
        },
    "r161":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "22",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(g)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
        },
    "r162":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "22",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(h)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
        },
    "r163":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "22",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
        },
    "r164":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "25",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599"
        },
    "r165":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "30",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599"
        },
    "r166":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "30",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599"
        },
    "r167":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "31",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8924-108599"
        },
    "r168":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "32",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599"
        },
    "r169":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "32",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599"
        },
    "r17":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6911-107765"
        },
    "r170":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "32",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599"
        },
    "r171":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8475-108599"
        },
    "r172":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "40",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9031-108599"
        },
    "r173":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "41",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599"
        },
    "r174":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "41",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599"
        },
    "r175":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "41",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599"
        },
    "r176":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "42",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e9054-108599"
        },
    "r177":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/topic&trid=2134510"
        },
    "r178":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4647-111522"
        },
    "r179":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522"
        },
    "r18":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6935-107765"
        },
    "r180":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118952595&loc=d3e4531-111522"
        },
    "r181":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=d3e4975-111524"
        },
    "r182":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11B",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524"
        },
    "r183":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11B",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524"
        },
    "r184":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524"
        },
    "r185":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5033-111524"
        },
    "r186":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524"
        },
    "r187":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=118936363&loc=d3e5093-111524"
        },
    "r188":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB Topic 4.E)",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707"
        },
    "r189":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "SubTopic":  "10",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/subtopic&trid=2196772"
        },
    "r19":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e7018-107765"
        },
    "r190":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "310",
        "URI":  "http://asc.fasb.org/extlink&oid=84159169&loc=d3e10133-111534"
        },
    "r191":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/topic&trid=2196928"
        },
    "r192":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "321",
        "URI":  "http://asc.fasb.org/topic&trid=75115024"
        },
    "r193":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "323",
        "URI":  "http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570"
        },
    "r194":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)(2)",
        "Topic":  "323",
        "URI":  "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571"
        },
    "r195":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "323",
        "URI":  "http://asc.fasb.org/topic&trid=2196965"
        },
    "r196":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "325",
        "URI":  "http://asc.fasb.org/topic&trid=2197064"
        },
    "r197":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446"
        },
    "r198":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919244-210447"
        },
    "r199":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(a)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
        },
    "r2":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=109222160&loc=SL51721523-107759"
        },
    "r20":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(1))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r200":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
        },
    "r201":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(d)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
        },
    "r202":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(e)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
        },
    "r203":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(f)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
        },
    "r204":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447"
        },
    "r205":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "14",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919253-210447"
        },
    "r206":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447"
        },
    "r207":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447"
        },
    "r208":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455"
        },
    "r209":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922895-210455"
        },
    "r21":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(13))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r210":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922900-210455"
        },
    "r211":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "30",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456"
        },
    "r212":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "30",
        "SubTopic":  "10",
        "Topic":  "330",
        "URI":  "http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311"
        },
    "r213":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266"
        },
    "r214":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=99380562&loc=d3e13777-109266"
        },
    "r215":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975"
        },
    "r216":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(e)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
        },
    "r217":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(f)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
        },
    "r218":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(g)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
        },
    "r219":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
        },
    "r22":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(14))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r220":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267"
        },
    "r221":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267"
        },
    "r222":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "SubTopic":  "20",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/subtopic&trid=2144439"
        },
    "r223":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274"
        },
    "r224":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274"
        },
    "r225":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
        },
    "r226":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(d)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
        },
    "r227":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "((a)(1),(b))",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
        },
    "r228":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
        },
    "r229":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)(1)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
        },
    "r23":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(17))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r230":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)(2)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
        },
    "r231":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)(3)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
        },
    "r232":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(d)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275"
        },
    "r233":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(b)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275"
        },
    "r234":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/topic&trid=2144416"
        },
    "r235":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
        },
    "r236":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
        },
    "r237":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
        },
    "r238":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229"
        },
    "r239":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230"
        },
    "r24":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(19))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r240":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(f)",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230"
        },
    "r241":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/topic&trid=2155823"
        },
    "r242":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)(2)",
        "Topic":  "420",
        "URI":  "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869"
        },
    "r243":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "420",
        "URI":  "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869"
        },
    "r244":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "420",
        "URI":  "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869"
        },
    "r245":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB TOPIC 5.P.3)",
        "Topic":  "420",
        "URI":  "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747"
        },
    "r246":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB TOPIC 5.P.4(b))",
        "Topic":  "420",
        "URI":  "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747"
        },
    "r247":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB TOPIC 5.P.4)",
        "Topic":  "420",
        "URI":  "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747"
        },
    "r248":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB Topic 5.P.4(d))",
        "Topic":  "420",
        "URI":  "http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747"
        },
    "r249":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "440",
        "URI":  "http://asc.fasb.org/topic&trid=2144648"
        },
    "r25":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(20))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r250":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349"
        },
    "r251":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14615-108349"
        },
    "r252":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14394-108349"
        },
    "r253":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349"
        },
    "r254":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14453-108349"
        },
    "r255":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14472-108349"
        },
    "r256":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/extlink&oid=118942415&loc=d3e14557-108349"
        },
    "r257":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/topic&trid=2127136"
        },
    "r258":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "15",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "460",
        "URI":  "http://asc.fasb.org/extlink&oid=99404985&loc=d3e10037-110241"
        },
    "r259":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "460",
        "URI":  "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12021-110248"
        },
    "r26":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(22))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r260":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "460",
        "URI":  "http://asc.fasb.org/extlink&oid=118943654&loc=d3e12053-110248"
        },
    "r261":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "470",
        "URI":  "http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601"
        },
    "r262":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "470",
        "URI":  "http://asc.fasb.org/extlink&oid=6802200&loc=SL6230698-112601"
        },
    "r263":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)(1)",
        "Topic":  "470",
        "URI":  "http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870"
        },
    "r264":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)(2)",
        "Topic":  "470",
        "URI":  "http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870"
        },
    "r265":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)(3)",
        "Topic":  "470",
        "URI":  "http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870"
        },
    "r266":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "470",
        "URI":  "http://asc.fasb.org/topic&trid=2208564"
        },
    "r267":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644"
        },
    "r268":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644"
        },
    "r269":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644"
        },
    "r27":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(26)(a))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r270":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644"
        },
    "r271":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644"
        },
    "r272":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.3-04)",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770"
        },
    "r273":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655"
        },
    "r274":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656"
        },
    "r275":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "505",
        "URI":  "http://asc.fasb.org/topic&trid=2208762"
        },
    "r276":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044"
        },
    "r277":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130532-203044"
        },
    "r278":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044"
        },
    "r279":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045"
        },
    "r28":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(26)(b))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r280":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)(1)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045"
        },
    "r281":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045"
        },
    "r282":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045"
        },
    "r283":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045"
        },
    "r284":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045"
        },
    "r285":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "91",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046"
        },
    "r286":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "91",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046"
        },
    "r287":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "91",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046"
        },
    "r288":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "91",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/extlink&oid=118944142&loc=SL49130690-203046-203046"
        },
    "r289":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/topic&trid=49130388"
        },
    "r29":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(28))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r290":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "10",
        "Topic":  "710",
        "URI":  "http://asc.fasb.org/extlink&oid=6409733&loc=d3e19512-108361"
        },
    "r291":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "30",
        "SubTopic":  "10",
        "Topic":  "710",
        "URI":  "http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363"
        },
    "r292":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "710",
        "URI":  "http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367"
        },
    "r293":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(e)",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
        },
    "r294":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(h)",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
        },
    "r295":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(k)(1)",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
        },
    "r296":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(k)(2)",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
        },
    "r297":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(n)",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
        },
    "r298":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(a)",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920"
        },
    "r299":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "17",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921"
        },
    "r3":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3B",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=109222160&loc=SL51721525-107759"
        },
    "r30":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(29))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r300":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "70",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942"
        },
    "r301":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/topic&trid=2235017"
        },
    "r302":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "35",
        "SubTopic":  "10",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116855982&loc=d3e4534-113899"
        },
    "r303":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
        },
    "r304":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
        },
    "r305":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901"
        },
    "r306":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)(1)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r307":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)(3)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r308":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a),(g)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r309":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b),(f)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r31":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(3))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r310":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r311":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)(i)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r312":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)(i)-(ii)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r313":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)(iii)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r314":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)(iv)(1)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r315":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)(iv)(2)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r316":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)(iv)(3)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r317":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)(iv)(4)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r318":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(2)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r319":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(2)(i)-(ii)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r32":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(30)(a)(1))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r320":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(2)(iii)(1)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r321":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(2)(iii)(2)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r322":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(2)(iii)(3)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r323":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(iii)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r324":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r325":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)(1)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r326":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(e)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r327":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(e)(1)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r328":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(e)(2)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r329":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(f)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r33":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(30)(a)(3))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r330":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(f)(2)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r331":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(f)(2)(i)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r332":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(f)(2)(ii)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r333":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(f)(2)(iii)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r334":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(f)(2)(iv)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r335":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(g)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r336":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(h)(1)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r337":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(h)(1)(i)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r338":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(i)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r339":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r34":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(30))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r340":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901"
        },
    "r341":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB Topic 14.D.2)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809"
        },
    "r342":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB Topic 14.F)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809"
        },
    "r343":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11149-113907"
        },
    "r344":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=118258462&loc=d3e11178-113907"
        },
    "r345":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/topic&trid=2228938"
        },
    "r346":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "35",
        "Subparagraph":  "(a)",
        "Topic":  "720",
        "URI":  "http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848"
        },
    "r347":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "35",
        "Subparagraph":  "(b)",
        "Topic":  "720",
        "URI":  "http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848"
        },
    "r348":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=117330534&loc=d3e28511-109314"
        },
    "r349":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314"
        },
    "r35":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(31))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r350":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "10",
        "Subparagraph":  "(g)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314"
        },
    "r351":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314"
        },
    "r352":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=117330534&loc=d3e28446-109314"
        },
    "r353":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "30",
        "SubTopic":  "10",
        "Subparagraph":  "(e)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=109238119&loc=d3e30536-109315"
        },
    "r354":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10B",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318"
        },
    "r355":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116821951&loc=d3e32123-109318"
        },
    "r356":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "25",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116821951&loc=d3e32247-109318"
        },
    "r357":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116821951&loc=d3e32280-109318"
        },
    "r358":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116821951&loc=d3e31931-109318"
        },
    "r359":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32672-109319"
        },
    "r36":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(32))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r360":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319"
        },
    "r361":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319"
        },
    "r362":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319"
        },
    "r363":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(e)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319"
        },
    "r364":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319"
        },
    "r365":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)(1)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319"
        },
    "r366":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)(3)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319"
        },
    "r367":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319"
        },
    "r368":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "17",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319"
        },
    "r369":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "19",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319"
        },
    "r37":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(4)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r370":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319"
        },
    "r371":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319"
        },
    "r372":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b),(c)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319"
        },
    "r373":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319"
        },
    "r374":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319"
        },
    "r375":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32847-109319"
        },
    "r376":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319"
        },
    "r377":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319"
        },
    "r378":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319"
        },
    "r379":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319"
        },
    "r38":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(7))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r380":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319"
        },
    "r381":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319"
        },
    "r382":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)-(b)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319"
        },
    "r383":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319"
        },
    "r384":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319"
        },
    "r385":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "217",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=117331294&loc=d3e36027-109320"
        },
    "r386":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB TOPIC 6.I.7)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817"
        },
    "r387":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB Topic 6.I.7)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817"
        },
    "r388":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(a)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324"
        },
    "r389":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "05",
        "SubTopic":  "30",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=65884525&loc=d3e40913-109327"
        },
    "r39":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(8))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r390":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/topic&trid=2144680"
        },
    "r391":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "10",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=116868678&loc=d3e961-128460"
        },
    "r392":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463"
        },
    "r393":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=79982066&loc=d3e1486-128463"
        },
    "r394":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Subparagraph":  "(c)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=77890550&loc=d3e5333-128473"
        },
    "r395":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "30",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476"
        },
    "r396":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "30",
        "SubTopic":  "30",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477"
        },
    "r397":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "30",
        "SubTopic":  "30",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477"
        },
    "r398":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(b)(3)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479"
        },
    "r399":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683"
        },
    "r4":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=109222160&loc=d3e1012-107759"
        },
    "r40":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.1)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r400":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683"
        },
    "r401":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "18",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=108774443&loc=SL4613673-111683"
        },
    "r402":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "19",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569616-111683"
        },
    "r403":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569643-111683"
        },
    "r404":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "21",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=108774443&loc=SL4613674-111683"
        },
    "r405":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "23",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=108774443&loc=SL4569655-111683"
        },
    "r406":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "24",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=108774443&loc=SL4616395-111683"
        },
    "r407":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)(1)",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
        },
    "r408":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)(2)",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
        },
    "r409":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)(1)",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
        },
    "r41":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.12)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r410":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c),(3)",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684"
        },
    "r411":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4I",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686"
        },
    "r412":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4J",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=116874947&loc=SL4591551-111686"
        },
    "r413":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4K",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=116874947&loc=SL4591552-111686"
        },
    "r414":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "815",
        "URI":  "http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959"
        },
    "r415":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4B",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "815",
        "URI":  "http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959"
        },
    "r416":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "182",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "815",
        "URI":  "http://asc.fasb.org/extlink&oid=116861445&loc=SL5629052-113961"
        },
    "r417":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611"
        },
    "r418":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "21",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611"
        },
    "r419":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "21",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611"
        },
    "r42":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.13(a))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r420":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "830",
        "URI":  "http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894"
        },
    "r421":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Topic":  "830",
        "URI":  "http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894"
        },
    "r422":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "830",
        "URI":  "http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895"
        },
    "r423":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "230",
        "Topic":  "830",
        "URI":  "http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906"
        },
    "r424":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Subparagraph":  "(b,c)",
        "Topic":  "830",
        "URI":  "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900"
        },
    "r425":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Topic":  "830",
        "URI":  "http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901"
        },
    "r426":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "835",
        "URI":  "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399"
        },
    "r427":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "835",
        "URI":  "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399"
        },
    "r428":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "835",
        "URI":  "http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399"
        },
    "r429":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "30",
        "Topic":  "835",
        "URI":  "http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400"
        },
    "r43":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.13)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r430":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "20",
        "Topic":  "840",
        "URI":  "http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707"
        },
    "r431":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "840",
        "URI":  "http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717"
        },
    "r432":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "840",
        "URI":  "http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717"
        },
    "r433":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "840",
        "URI":  "http://asc.fasb.org/topic&trid=2208923"
        },
    "r434":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "65",
        "SubTopic":  "10",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=119364159&loc=SL77916155-209984"
        },
    "r435":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(a)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977"
        },
    "r436":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977"
        },
    "r437":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(c)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977"
        },
    "r438":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(a)(3)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980"
        },
    "r439":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980"
        },
    "r44":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.14)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r440":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
        },
    "r441":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(e)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
        },
    "r442":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(g)(1)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
        },
    "r443":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(g)(2)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
        },
    "r444":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(g)(3)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
        },
    "r445":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(g)(4)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
        },
    "r446":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980"
        },
    "r447":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "53",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971"
        },
    "r448":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
        },
    "r449":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864"
        },
    "r45":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.17)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r450":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864"
        },
    "r451":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864"
        },
    "r452":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/extlink&oid=6457730&loc=d3e39622-107864"
        },
    "r453":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "850",
        "URI":  "http://asc.fasb.org/topic&trid=2122745"
        },
    "r454":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "852",
        "URI":  "http://asc.fasb.org/extlink&oid=6918054&loc=d3e56071-112765"
        },
    "r455":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "855",
        "URI":  "http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662"
        },
    "r456":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "855",
        "URI":  "http://asc.fasb.org/topic&trid=2122774"
        },
    "r457":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "50",
        "Topic":  "860",
        "URI":  "http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746"
        },
    "r458":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "310",
        "Subparagraph":  "(b)",
        "Topic":  "910",
        "URI":  "http://asc.fasb.org/extlink&oid=118388040&loc=d3e49370-109356"
        },
    "r459":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "340",
        "Topic":  "928",
        "URI":  "http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004"
        },
    "r46":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.19(a))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r460":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(a)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61929-109447"
        },
    "r461":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(b)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61929-109447"
        },
    "r462":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(a)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62059-109447"
        },
    "r463":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "20",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(b)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62059-109447"
        },
    "r464":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(a)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62395-109447"
        },
    "r465":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(b)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62395-109447"
        },
    "r466":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "33",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(a)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447"
        },
    "r467":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "33",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(b)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e62479-109447"
        },
    "r468":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "35A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(a)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447"
        },
    "r469":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "35A",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(b)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=SL6807758-109447"
        },
    "r47":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.19(a),20,24)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r470":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(c)(1)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61872-109447"
        },
    "r471":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "235",
        "Subparagraph":  "(c)(2)",
        "Topic":  "932",
        "URI":  "http://asc.fasb.org/extlink&oid=68064819&loc=d3e61872-109447"
        },
    "r472":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "25",
        "SubTopic":  "20",
        "Topic":  "940",
        "URI":  "http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953"
        },
    "r473":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(1)(a))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r474":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(10))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r475":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(11))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r476":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(13))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r477":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(15)(2))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r478":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(16))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r479":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(22))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r48":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.19(b),22(b))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r480":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(23))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r481":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03.10)",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r482":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03.17)",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r483":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04(19))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r484":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.9-04(13)(f))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r485":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.9-04(15))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r486":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.9-04(20))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r487":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.9-04(22))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r488":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.9-04(23))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r489":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.9-04.10)",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r49":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.19,20)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r490":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "470",
        "Subparagraph":  "(c)",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823"
        },
    "r491":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "470",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823"
        },
    "r492":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "825",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=108315417&loc=d3e61044-112788"
        },
    "r493":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(15)(b)(2))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r494":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(16))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r495":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(10))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r496":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(12))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r497":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(16))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r498":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(23)(a)(4))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r499":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(24))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r5":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760"
        },
    "r50":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.19-26)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r500":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(25))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r501":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(8))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r502":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03.(a),19)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r503":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03.5(c))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r504":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04(10))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r505":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04(11))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r506":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04(12))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r507":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04(18))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r508":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04(19))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r509":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04(8))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r51":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.20)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r510":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4H",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "40",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116884468&loc=SL65671331-158438"
        },
    "r511":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13H",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "40",
        "Subparagraph":  "(a)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=117419784&loc=SL117783719-158441"
        },
    "r512":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13H",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "40",
        "Subparagraph":  "(b)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=117419784&loc=SL117783719-158441"
        },
    "r513":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13H",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "40",
        "Subparagraph":  "(c)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=117419784&loc=SL117783719-158441"
        },
    "r514":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1B",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "825",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=99380617&loc=SL75241803-196195"
        },
    "r515":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "320",
        "Subparagraph":  "(SX 210.12-12)",
        "Topic":  "946",
        "URI":  "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010"
        },
    "r516":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "310",
        "Subparagraph":  "(SX 210.12-29(Footnote 4))",
        "Topic":  "948",
        "URI":  "http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014"
        },
    "r517":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "210",
        "Topic":  "954",
        "URI":  "http://asc.fasb.org/extlink&oid=116631420&loc=SL116631458-115580"
        },
    "r518":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "740",
        "Topic":  "954",
        "URI":  "http://asc.fasb.org/extlink&oid=6491622&loc=d3e9504-115650"
        },
    "r519":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "360",
        "Subparagraph":  "(SX 210.12-28(Footnote 2))",
        "Topic":  "970",
        "URI":  "http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024"
        },
    "r52":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.21)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r520":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "360",
        "Subparagraph":  "(SX 210.12-28(Footnote 4))",
        "Topic":  "970",
        "URI":  "http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024"
        },
    "r521":  {
        "Name":  "Exchange Act",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "b"
        },
    "r522":  {
        "Name":  "Exchange Act",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "b-23"
        },
    "r523":  {
        "Name":  "Exchange Act",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "d1-1"
        },
    "r524":  {
        "Name":  "Forms 10-K, 10-Q, 20-F",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "13",
        "Subsection":  "a-1-"
        },
    "r525":  {
        "Name":  "Forms 10-K, 20-F, 40-F",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "15",
        "Subsection":  "d-1"
        },
    "r526":  {
        "Name":  "Regulation 12B",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "b-2"
        },
    "r527":  {
        "Name":  "Regulation S-T",
        "Number":  "232",
        "Publisher":  "SEC",
        "Section":  "405"
        },
    "r528":  {
        "Footnote":  "2",
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "28"
        },
    "r529":  {
        "Footnote":  "4",
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "28"
        },
    "r53":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.22(a)(1))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r530":  {
        "Footnote":  "4",
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "29"
        },
    "r531":  {
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "09"
        },
    "r54":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.22)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r55":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.24)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r56":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.25)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r57":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.29,30)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r58":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.29-31)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r59":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.3(a)(2))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r6":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(d)",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760"
        },
    "r60":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.3(a)(4))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r61":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.3(c)(4))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r62":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.3(c))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r63":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.3,4)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r64":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.31)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r65":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02.9)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r66":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
        },
    "r67":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
        },
    "r68":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580"
        },
    "r69":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "14",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580"
        },
    "r7":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760"
        },
    "r70":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "14A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580"
        },
    "r71":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "17B",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL34724394-108580"
        },
    "r72":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
        },
    "r73":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
        },
    "r74":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669619-108580"
        },
    "r75":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1B",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580"
        },
    "r76":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1B",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669625-108580"
        },
    "r77":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=d3e557-108580"
        },
    "r78":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116657188&loc=SL116659661-227067"
        },
    "r79":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118951672&loc=d3e1436-108581"
        },
    "r8":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5B",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(c)(1)",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760"
        },
    "r80":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.3-03(e))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868656-224227"
        },
    "r81":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(13))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868656-224227"
        },
    "r82":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(1))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r83":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(10))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r84":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(12))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r85":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(20))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r86":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(21))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r87":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(5))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r88":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(8))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r89":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.1)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r9":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5C",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)(2)",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760"
        },
    "r90":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.1,2)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r91":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.13)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r92":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.2)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r93":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.4)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r94":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.9)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r95":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r96":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
        },
    "r97":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "14",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585"
        },
    "r98":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "14",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585"
        },
    "r99":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
        }
    },
"version":  "2.1"
}

↑Top
Filing Submission 0001287808-20-000014   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)
Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
About — Privacy — Redactions — Help — Mon., Apr. 29, 1:27:25.8pm ET