SEC Info - Stewart Information Services Corp - ‘10-K’ for 12/31/19

SEC Info℠

Home

Help

Please Sign In

Stewart Information Services Corp – ‘10-K’ for 12/31/19 – ‘JSON’

On: Thursday, 2/27/20, at 12:08pm ET · For: 12/31/19 · Accession #: 94344-20-6 · File #: 1-02658

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

 2/27/20  Stewart Information Services Corp 10-K       12/31/19  133:13M

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 -- stewart201910-k                    HTML   1.66M 
 2: EX-4.4      Exhibit 4.4 Desc of Securities                      HTML     47K 
 8: EX-10.10    Exhibit 10.10 Lessack Rsu Agreement                 HTML     52K 
 9: EX-10.11    Exhibit 10.11 Eppinger Option Agreement             HTML     60K 
10: EX-10.12    Exhibit 10.12 Hisey Option Agreement                HTML     60K 
11: EX-10.13    Exhibit 10.13 Killea Option Agreement               HTML     60K 
12: EX-10.14    Exhibit 10.14 Lessack Option Agreement              HTML     60K 
 3: EX-10.5     Exhibit 10.5 Magness Separation Agreement           HTML     86K 
 4: EX-10.6     Exhibit 10.6 Morris Separation Agreement            HTML     72K 
 5: EX-10.7     Exhibit 10.7 Eppinger Rsu Agreement                 HTML     52K 
 6: EX-10.8     Exhibit 10.8 Hisey Rsu Agreement                    HTML     52K 
 7: EX-10.9     Exhibit 10.9 Killea Rsu Agreement                   HTML     52K 
13: EX-21.1     Exhibit 21.1 Subsidiaries                           HTML     54K 
14: EX-23.1     Exhibit 23.1 Kpmg Consent2019                       HTML     36K 
15: EX-31.1     Exhibit 31.1 CEO Section 302                        HTML     43K 
16: EX-31.2     Exhibit 31.2 CFO Section 302                        HTML     42K 
17: EX-32.1     Exhibit 32.1 CEO Section 906                        HTML     37K 
18: EX-32.2     Exhibit 32.2 CFO Section 906                        HTML     37K 
52: R1          Cover Page                                          HTML     99K 
122: R2          Consolidated Statements of Income and               HTML    142K  
                Comprehensive Income                                             
82: R3          Consolidated Balance Sheets                         HTML    162K 
38: R4          Consolidated Balance Sheets (Parenthetical)         HTML     49K 
51: R5          Consolidated Statements of Cash Flows               HTML    171K 
120: R6          Consolidated Statements of Equity                   HTML     92K  
80: R7          Consolidated Statements of Equity (Parenthetical)   HTML     37K 
35: R8          General                                             HTML     82K 
54: R9          Restrictions on cash and investments                HTML     40K 
118: R10         Statutory surplus and dividend restrictions         HTML     42K  
83: R11         Investments in debt and equity securities           HTML    185K 
34: R12         Fair value measurements                             HTML     88K 
53: R13         Investment income and net realized and unrealized   HTML    185K 
                gains                                                            
119: R14         Income taxes                                        HTML    127K  
84: R15         Goodwill and other intangibles                      HTML     53K 
37: R16         Equity investees                                    HTML     56K 
55: R17         Notes payable                                       HTML     54K 
121: R18         Estimated title losses                              HTML     67K  
81: R19         Share-based payments                                HTML     64K 
32: R20         Earnings per share                                  HTML     58K 
75: R21         Reinsurance                                         HTML     38K 
113: R22         Leases                                              HTML    122K  
102: R23         Contingent liabilities and commitments              HTML     41K  
33: R24         Regulatory and legal developments                   HTML     39K 
76: R25         Revenues                                            HTML     52K 
115: R26         Segment information                                 HTML     75K  
103: R27         Other comprehensive income (Loss)                   HTML     74K  
31: R28         Quarterly financial information (Unaudited)         HTML     66K 
77: R29         Schedule I - Financial Information of the           HTML    212K 
                Registrant (Parent Company)                                      
59: R30         Schedule II - Valuation and Qualifying Accounts     HTML     85K 
41: R31         General (Policies)                                  HTML    118K 
79: R32         Investments in debt and equity securities (Tables)  HTML    164K 
117: R33         Fair value measurements (Tables)                    HTML     83K  
57: R34         Investment income and net realized and unrealized   HTML    100K 
                gains (Tables)                                                   
39: R35         Income taxes (Tables)                               HTML    125K 
78: R36         Goodwill and other intangibles (Tables)             HTML     48K 
116: R37         Equity investees (Tables)                           HTML     51K  
56: R38         Notes payable (Tables)                              HTML     43K 
42: R39         Estimated title losses (Tables)                     HTML     69K 
70: R40         Share-based payments (Tables)                       HTML     56K 
25: R41         Earnings per share (Tables)                         HTML     57K 
101: R42         Leases (Tables)                                     HTML    101K  
111: R43         Revenues (Tables)                                   HTML     52K  
69: R44         Segment information (Tables)                        HTML     77K 
24: R45         Other comprehensive income (Loss) (Tables)          HTML     74K 
100: R46         Quarterly financial information (Unaudited)         HTML     66K  
                (Tables)                                                         
110: R47         General - General (Details)                         HTML     36K  
68: R48         General - Title Losses and Related Claims           HTML     41K 
                (Details)                                                        
26: R49         General - Investments in Debt and Equity            HTML     38K 
                Securities (Details)                                             
45: R50         General - Property and Equipment (Details)          HTML     44K 
60: R51         General - Impairment of Long-lived Assets           HTML     37K 
                (Details)                                                        
132: R52         General - Goodwill (Details)                        HTML     36K  
91: R53         General - Other Intangibles (Details)               HTML     39K 
46: R54         General - Recently Adopted Accounting               HTML     43K 
                Pronouncements (Details)                                         
61: R55         General - Merger Agreement Termination (Details)    HTML     37K 
133: R56         Restrictions on cash and investments (Details)      HTML     41K  
92: R57         Statutory surplus and dividend restrictions         HTML     53K 
                (Details)                                                        
44: R58         Investments in debt and equity securities -         HTML     41K 
                Investments in Debt and Equity Securities                        
                (Details)                                                        
63: R59         Investments in debt and equity securities -         HTML     53K 
                Additional Information (Details)                                 
105: R60         Investments in debt and equity securities -         HTML     51K  
                Amortized Costs and Fair Values (Details)                        
97: R61         Investments in debt and equity securities - Gross   HTML     50K 
                Unrealized Gains and Losses (Details)                            
28: R62         Investments in debt and equity securities - Debt    HTML     68K 
                Securities According Contractual Terms (Details)                 
72: R63         Investments in debt and equity securities - Gross   HTML     72K 
                Unrealized Losses on Investments and Fair Values                 
                of Related Securities (Details)                                  
106: R64         Fair value measurements (Details)                   HTML     72K  
98: R65         Investment income and net realized and unrealized   HTML     52K 
                gains - Income from Investments and Net Realized                 
                and Unrealized Gains (Details)                                   
29: R66         Investment income and net realized and unrealized   HTML     56K 
                gains - Additional Information (Details)                         
73: R67         Investment income and net realized and unrealized   HTML     42K 
                gains - Net Gains (Losses) on Investments in                     
                Equity Securities Still Held (Details)                           
109: R68         Investment income and net realized and unrealized   HTML     47K  
                gains - Proceeds from Sale of Investment (Details)               
95: R69         Income taxes - Additional Information (Details)     HTML     62K 
87: R70         Income taxes - Income Tax Expense (Benefit)         HTML     66K 
                (Details)                                                        
127: R71         Income taxes - Reconciliation of Income Tax         HTML     70K  
                Expenses Computed at Federal Statutory Rate with                 
                Income Tax Expense (Details)                                     
66: R72         Income taxes - Reconciliation of Income Tax         HTML     40K 
                Expenses Computed at Federal Statutory Rate with                 
                Income Tax Expense (Additional Information)                      
                (Details)                                                        
49: R73         Income taxes - Deferred Tax Assets and Liabilities  HTML     94K 
                (Details)                                                        
86: R74         Goodwill and other intangibles - Summary of         HTML     49K 
                Goodwill (Details)                                               
126: R75         Goodwill and other intangibles - Additional         HTML     76K  
                Information (Details)                                            
65: R76         Equity investees - Summarized Aggregate Financial   HTML     55K 
                Information for Equity Investees (Details)                       
48: R77         Equity investees - Additional Information           HTML     50K 
                (Details)                                                        
89: R78         Notes payable - Summary of Notes Payable (Details)  HTML     47K 
123: R79         Notes payable - Additional Information (Details)    HTML     99K  
88: R80         Estimated title losses - Estimated Title Losses     HTML     65K 
                (Details)                                                        
129: R81         Estimated title losses - Additional Information     HTML     44K  
                (Details)                                                        
67: R82         Share-based payments - Additional Information       HTML     75K 
                (Details)                                                        
50: R83         Share-based payments - Summary of the Restricted    HTML     71K 
                Common Stock Award/Unit Activity (Details)                       
85: R84         Earnings per share (Details)                        HTML     65K 
125: R85         Reinsurance (Details)                               HTML     41K  
64: R86         Leases - Additional Information (Details)           HTML     43K 
47: R87         Leases - Classification of Leases (Details)         HTML     47K 
90: R88         Leases - Other Information Related to Leases        HTML     56K 
                (Details)                                                        
124: R89         Leases - Future Minimum Lease Payments (Details)    HTML     75K  
104: R90         Leases - Summary of Future Minimum Lease Payments   HTML     55K  
                of Operating Leases (Details)                                    
96: R91         Contingent liabilities and commitments (Details)    HTML     43K 
27: R92         Revenues (Details)                                  HTML     49K 
71: R93         Segment information - Additional Information        HTML     40K 
                (Details)                                                        
107: R94         Segment information - Selected Statement of         HTML     58K  
                Operations and Income (Loss) Information Related                 
                to Segments (Details)                                            
99: R95         Segment information - Revenues Generated in         HTML     47K 
                Domestic and Foreign Country (Details)                           
30: R96         Other comprehensive income (Loss) (Details)         HTML     73K 
74: R97         Quarterly financial information (Unaudited)         HTML     52K 
                (Details)                                                        
108: R98         Schedule I - Financial Information of the           HTML    105K  
                Registrant (Parent Company) - Statements of Income               
                and Retained Earnings (Details)                                  
94: R99         Schedule I - Financial Information of the           HTML     40K 
                Registrant (Parent Company) - Statements of Income               
                and Retained Earnings, Additional Information                    
                (Details)                                                        
130: R100        Schedule I - Financial Information of the           HTML    135K  
                Registrant (Parent Company) - Balance Sheets                     
                (Details)                                                        
93: R101        Schedule I - Financial Information of the           HTML     51K 
                Registrant (Parent Company) - Balance Sheets                     
                (Additional Information) (Details)                               
43: R102        Schedule I - Financial Information of the           HTML    139K 
                Registrant (Parent Company) - Statements of Cash                 
                Flows (Details)                                                  
62: R103        Schedule I - Financial Information of the           HTML     63K 
                Registrant (Parent Company) - Additional                         
                Information (Details)                                            
131: R104        Schedule II - Valuation and Qualifying Accounts     HTML     51K  
                (Details)                                                        
112: R9999       Uncategorized Items - stewart201910-k.htm           HTML     37K  
40: XML         IDEA XML File -- Filing Summary                      XML    231K 
58: XML         XBRL Instance -- stewart201910-k_htm                 XML   2.93M 
128: EXCEL       IDEA Workbook of Financial Reports                  XLSX    126K  
20: EX-101.CAL  XBRL Calculations -- stc-20191231_cal                XML    396K 
21: EX-101.DEF  XBRL Definitions -- stc-20191231_def                 XML    782K 
22: EX-101.LAB  XBRL Labels -- stc-20191231_lab                      XML   2.11M 
23: EX-101.PRE  XBRL Presentations -- stc-20191231_pre               XML   1.38M 
19: EX-101.SCH  XBRL Schema -- stc-20191231                          XSD    211K 
114: JSON        XBRL Instance as JSON Data -- MetaLinks              479±   729K  
36: ZIP         XBRL Zipped Folder -- 0000094344-20-000006-xbrl      Zip    497K

‘JSON’ — XBRL Instance as JSON Data — MetaLinks

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

{
"instance":  {
    "stewart201910-k.htm":  {
        "axisCustom":  0,
        "axisStandard":  24,
        "contextCount":  253,
        "dts":  {
            "calculationLink":  {
                "local":  [
                    "stc-20191231_cal.xml"
                    ]
                },
            "definitionLink":  {
                "local":  [
                    "stc-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":  [
                    "stewart201910-k.htm"
                    ]
                },
            "labelLink":  {
                "local":  [
                    "stc-20191231_lab.xml"
                    ],
                "remote":  [
                    "https://xbrl.sec.gov/dei/2019/dei-doc-2019-01-31.xml",
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-doc-2019-01-31.xml",
                    "http://xbrl.fasb.org/srt/2019/elts/srt-doc-2019-01-31.xml"
                    ]
                },
            "presentationLink":  {
                "local":  [
                    "stc-20191231_pre.xml"
                    ]
                },
            "referenceLink":  {
                "remote":  [
                    "http://xbrl.fasb.org/srt/2019/elts/srt-ref-2019-01-31.xml",
                    "https://xbrl.sec.gov/dei/2019/dei-ref-2019-01-31.xml",
                    "http://xbrl.fasb.org/us-gaap/2019/elts/us-gaap-ref-2019-01-31.xml"
                    ]
                },
            "schema":  {
                "local":  [
                    "stc-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/invest/2013/invest-2013-01-31.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":  686,
        "entityCount":  1,
        "hidden":  {
            "http://fasb.org/us-gaap/2019-01-31":  39,
            "http://www.stewart.com/20191231":  2,
            "http://xbrl.sec.gov/dei/2019-01-31":  5,
            "total":  46
            },
        "keyCustom":  44,
        "keyStandard":  467,
        "memberCustom":  16,
        "memberStandard":  49,
        "nsprefix":  "stc",
        "nsuri":  "http://www.stewart.com/20191231",
        "report":  {
            "R1":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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.stewart.com/role/CoverPage",
                "shortName":  "Cover Page",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "dei:DocumentType",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R10":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:RestrictionsOnDividendsLoansAndAdvancesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2103100 - Disclosure - Statutory surplus and dividend restrictions",
                "role":  "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictions",
                "shortName":  "Statutory surplus and dividend restrictions",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:RestrictionsOnDividendsLoansAndAdvancesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R100":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CashAndCashEquivalentsAtCarryingValue",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "",
                "isDefault":  "false",
                "longName":  "2443403 - Schedule - Schedule I - Financial Information of the Registrant (Parent Company) - Balance Sheets (Details)",
                "role":  "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails",
                "shortName":  "Schedule I - Financial Information of the Registrant (Parent Company) - Balance Sheets (Details)",
                "subGroupType":  "parenthetical",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4_srt_ConsolidatedEntitiesAxis_srt_ParentCompanyMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:CashAndCashEquivalentsAtCarryingValue",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R101":  {
                "firstAnchor":  null,
                "groupType":  "",
                "isDefault":  "false",
                "longName":  "2443404 - Schedule - Schedule I - Financial Information of the Registrant (Parent Company) - Balance Sheets (Additional Information) (Details)",
                "role":  "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsAdditionalInformationDetails",
                "shortName":  "Schedule I - Financial Information of the Registrant (Parent Company) - Balance Sheets (Additional Information) (Details)",
                "subGroupType":  "parenthetical",
                "uniqueAnchor":  null
                },
            "R102":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfQuarterlyFinancialInformationTableTextBlock",
                        "us-gaap:QuarterlyFinancialInformationTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4QTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:NetIncomeLoss",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "",
                "isDefault":  "false",
                "longName":  "2443405 - Schedule - Schedule I - Financial Information of the Registrant (Parent Company) - Statements of Cash Flows (Details)",
                "role":  "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails",
                "shortName":  "Schedule I - Financial Information of the Registrant (Parent Company) - Statements of Cash Flows (Details)",
                "subGroupType":  "parenthetical",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD_srt_ConsolidatedEntitiesAxis_srt_ParentCompanyMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:DepreciationAndAmortization",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R103":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q3YTD",
                    "decimals":  "-6",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:GainLossOnContractTermination",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2443406 - Disclosure - Schedule I - Financial Information of the Registrant (Parent Company) - Additional Information (Details)",
                "role":  "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails",
                "shortName":  "Schedule I - Financial Information of the Registrant (Parent Company) - Additional Information (Details)",
                "subGroupType":  "parenthetical",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2018Q4YTD_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_us-gaap_AccountingStandardsUpdate201802Member_us-gaap_StatementEquityComponentsAxis_us-gaap_RetainedEarningsMember",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "us-gaap:TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R104":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "srt:ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2018Q4_us-gaap_ValuationAllowancesAndReservesTypeAxis_stc_EstimatedTitleLossesMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ValuationAllowancesAndReservesBalance",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "",
                "isDefault":  "false",
                "longName":  "2444401 - Schedule - Schedule II - Valuation and Qualifying Accounts (Details)",
                "role":  "http://www.stewart.com/role/ScheduleIiValuationAndQualifyingAccountsDetails",
                "shortName":  "Schedule II - Valuation and Qualifying Accounts (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "srt:ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2016Q4_us-gaap_ValuationAllowancesAndReservesTypeAxis_stc_EstimatedTitleLossesMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:ValuationAllowancesAndReservesBalance",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R11":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
                    "reportCount":  1,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2104100 - Disclosure - Investments in debt and equity securities",
                "role":  "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecurities",
                "shortName":  "Investments in debt and equity securities",
                "subGroupType":  "",
                "uniqueAnchor":  null
                },
            "R12":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:FairValueDisclosuresTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2105100 - Disclosure - Fair value measurements",
                "role":  "http://www.stewart.com/role/FairValueMeasurements",
                "shortName":  "Fair value measurements",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:FairValueDisclosuresTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R13":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
                    "reportCount":  1,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2106100 - Disclosure - Investment income and net realized and unrealized gains",
                "role":  "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGains",
                "shortName":  "Investment income and net realized and unrealized gains",
                "subGroupType":  "",
                "uniqueAnchor":  null
                },
            "R14":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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":  "2107100 - Disclosure - Income taxes",
                "role":  "http://www.stewart.com/role/IncomeTaxes",
                "shortName":  "Income taxes",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:IncomeTaxDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R15":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2108100 - Disclosure - Goodwill and other intangibles",
                "role":  "http://www.stewart.com/role/GoodwillAndOtherIntangibles",
                "shortName":  "Goodwill and other intangibles",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R16":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:EquityMethodInvestmentsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2109100 - Disclosure - Equity investees",
                "role":  "http://www.stewart.com/role/EquityInvestees",
                "shortName":  "Equity investees",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:EquityMethodInvestmentsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R17":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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":  "2110100 - Disclosure - Notes payable",
                "role":  "http://www.stewart.com/role/NotesPayable",
                "shortName":  "Notes payable",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "stc:EstimatedTitleLossesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2111100 - Disclosure - Estimated title losses",
                "role":  "http://www.stewart.com/role/EstimatedTitleLosses",
                "shortName":  "Estimated title losses",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "stc:EstimatedTitleLossesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R19":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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":  "2113100 - Disclosure - Share-based payments",
                "role":  "http://www.stewart.com/role/ShareBasedPayments",
                "shortName":  "Share-based payments",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R2":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:RevenueFromContractWithCustomerTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1001000 - Statement - CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME",
                "role":  "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                "shortName":  "CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:InsuranceCommissions",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R20":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:EarningsPerShareTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2114100 - Disclosure - Earnings per share",
                "role":  "http://www.stewart.com/role/EarningsPerShare",
                "shortName":  "Earnings per share",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:EarningsPerShareTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R21":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ReinsuranceTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2115100 - Disclosure - Reinsurance",
                "role":  "http://www.stewart.com/role/Reinsurance",
                "shortName":  "Reinsurance",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ReinsuranceTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R22":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "us-gaap:LesseeFinanceLeasesTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:LesseeOperatingLeasesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2116100 - Disclosure - Leases",
                "role":  "http://www.stewart.com/role/Leases",
                "shortName":  "Leases",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "us-gaap:LesseeFinanceLeasesTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:LesseeOperatingLeasesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R23":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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":  "2117100 - Disclosure - Contingent liabilities and commitments",
                "role":  "http://www.stewart.com/role/ContingentLiabilitiesAndCommitments",
                "shortName":  "Contingent liabilities and commitments",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R24":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:LegalMattersAndContingenciesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2118100 - Disclosure - Regulatory and legal developments",
                "role":  "http://www.stewart.com/role/RegulatoryAndLegalDevelopments",
                "shortName":  "Regulatory and legal developments",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:LegalMattersAndContingenciesTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R25":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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":  "2119100 - Disclosure - Revenues",
                "role":  "http://www.stewart.com/role/Revenues",
                "shortName":  "Revenues",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:RevenueFromContractWithCustomerTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R26":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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":  "2120100 - Disclosure - Segment information",
                "role":  "http://www.stewart.com/role/SegmentInformation",
                "shortName":  "Segment information",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:SegmentReportingDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R27":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ComprehensiveIncomeNoteTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2121100 - Disclosure - Other comprehensive income (loss)",
                "role":  "http://www.stewart.com/role/OtherComprehensiveIncomeLoss",
                "shortName":  "Other comprehensive income (loss)",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ComprehensiveIncomeNoteTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R28":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:QuarterlyFinancialInformationTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2122100 - Disclosure - Quarterly financial information (unaudited)",
                "role":  "http://www.stewart.com/role/QuarterlyFinancialInformationUnaudited",
                "shortName":  "Quarterly financial information (unaudited)",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:QuarterlyFinancialInformationTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R29":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "",
                "isDefault":  "false",
                "longName":  "2143100 - Schedule - Schedule I - Financial Information of the Registrant (Parent Company)",
                "role":  "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompany",
                "shortName":  "Schedule I - Financial Information of the Registrant (Parent Company)",
                "subGroupType":  "parenthetical",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R3":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CashAndCashEquivalentsAtCarryingValue",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1002000 - Statement - CONSOLIDATED BALANCE SHEETS",
                "role":  "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                "shortName":  "CONSOLIDATED BALANCE SHEETS",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:ShortTermInvestments",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R30":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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":  "2144100 - Schedule - Schedule II - Valuation and Qualifying Accounts",
                "role":  "http://www.stewart.com/role/ScheduleIiValuationAndQualifyingAccounts",
                "shortName":  "Schedule II - Valuation and Qualifying Accounts",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "srt:ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R31":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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":  "2201201 - Disclosure - General (Policies)",
                "role":  "http://www.stewart.com/role/GeneralPolicies",
                "shortName":  "General (Policies)",
                "subGroupType":  "policies",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:BasisOfAccountingPolicyPolicyTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R32":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:TradingSecuritiesAndCertainTradingAssetsTextBlock",
                    "reportCount":  1,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2304301 - Disclosure - Investments in debt and equity securities (Tables)",
                "role":  "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesTables",
                "shortName":  "Investments in debt and equity securities (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "lang":  "en-US",
                    "name":  "us-gaap:UnrealizedGainLossOnInvestmentsTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R33":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2305301 - Disclosure - Fair value measurements (Tables)",
                "role":  "http://www.stewart.com/role/FairValueMeasurementsTables",
                "shortName":  "Fair value measurements (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R34":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfRealizedGainLossTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2306301 - Disclosure - Investment income and net realized and unrealized gains (Tables)",
                "role":  "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsTables",
                "shortName":  "Investment income and net realized and unrealized gains (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfRealizedGainLossTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R35":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2307301 - Disclosure - Income taxes (Tables)",
                "role":  "http://www.stewart.com/role/IncomeTaxesTables",
                "shortName":  "Income taxes (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R36":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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":  "2308301 - Disclosure - Goodwill and other intangibles (Tables)",
                "role":  "http://www.stewart.com/role/GoodwillAndOtherIntangiblesTables",
                "shortName":  "Goodwill and other intangibles (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfGoodwillTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R37":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "us-gaap:EquityMethodInvestmentsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:EquityMethodInvestmentsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2309301 - Disclosure - Equity investees (Tables)",
                "role":  "http://www.stewart.com/role/EquityInvesteesTables",
                "shortName":  "Equity investees (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "div",
                        "us-gaap:EquityMethodInvestmentsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:EquityMethodInvestmentsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R38":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "us-gaap:DebtDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfDebtTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2310301 - Disclosure - Notes payable (Tables)",
                "role":  "http://www.stewart.com/role/NotesPayableTables",
                "shortName":  "Notes payable (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "us-gaap:DebtDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfDebtTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R39":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "stc:EstimatedTitleLossesTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfLossContingenciesByContingencyTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2311301 - Disclosure - Estimated title losses (Tables)",
                "role":  "http://www.stewart.com/role/EstimatedTitleLossesTables",
                "shortName":  "Estimated title losses (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "stc:EstimatedTitleLossesTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfLossContingenciesByContingencyTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R4":  {
                "firstAnchor":  null,
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1002501 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)",
                "role":  "http://www.stewart.com/role/ConsolidatedBalanceSheetsParenthetical",
                "shortName":  "CONSOLIDATED BALANCE SHEETS (Parenthetical)",
                "subGroupType":  "parenthetical",
                "uniqueAnchor":  null
                },
            "R40":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:NonvestedRestrictedStockSharesActivityTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2313301 - Disclosure - Share-based payments (Tables)",
                "role":  "http://www.stewart.com/role/ShareBasedPaymentsTables",
                "shortName":  "Share-based payments (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:NonvestedRestrictedStockSharesActivityTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R41":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "us-gaap:EarningsPerShareTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2314301 - Disclosure - Earnings per share (Tables)",
                "role":  "http://www.stewart.com/role/EarningsPerShareTables",
                "shortName":  "Earnings per share (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "us-gaap:EarningsPerShareTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R42":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "stc:AssetsAndLiabilitiesLesseeTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2316301 - Disclosure - Leases (Tables)",
                "role":  "http://www.stewart.com/role/LeasesTables",
                "shortName":  "Leases (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "stc:AssetsAndLiabilitiesLesseeTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R43":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "us-gaap:RevenueFromContractWithCustomerTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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":  "2319301 - Disclosure - Revenues (Tables)",
                "role":  "http://www.stewart.com/role/RevenuesTables",
                "shortName":  "Revenues (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "us-gaap:RevenueFromContractWithCustomerTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:DisaggregationOfRevenueTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R44":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "us-gaap:SegmentReportingDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2320301 - Disclosure - Segment information (Tables)",
                "role":  "http://www.stewart.com/role/SegmentInformationTables",
                "shortName":  "Segment information (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "us-gaap:SegmentReportingDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R45":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "us-gaap:ComprehensiveIncomeNoteTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2321301 - Disclosure - Other comprehensive income (loss) (Tables)",
                "role":  "http://www.stewart.com/role/OtherComprehensiveIncomeLossTables",
                "shortName":  "Other comprehensive income (loss) (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "us-gaap:ComprehensiveIncomeNoteTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R46":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "us-gaap:QuarterlyFinancialInformationTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfQuarterlyFinancialInformationTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2322301 - Disclosure - Quarterly financial information (unaudited) (Tables)",
                "role":  "http://www.stewart.com/role/QuarterlyFinancialInformationUnauditedTables",
                "shortName":  "Quarterly financial information (unaudited) (Tables)",
                "subGroupType":  "tables",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "us-gaap:QuarterlyFinancialInformationTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:ScheduleOfQuarterlyFinancialInformationTableTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R47":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "2",
                    "first":  true,
                    "lang":  null,
                    "name":  "stc:EntityWideRevenueMajorBusinessSegmentPercentage",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2401402 - Disclosure - General - General (Details)",
                "role":  "http://www.stewart.com/role/GeneralGeneralDetails",
                "shortName":  "General - General (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "2",
                    "first":  true,
                    "lang":  null,
                    "name":  "stc:EntityWideRevenueMajorBusinessSegmentPercentage",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    }
                },
            "R48":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "stc:LargeClaimsMinimumThresholdAmount",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2401403 - Disclosure - General - Title Losses and Related Claims (Details)",
                "role":  "http://www.stewart.com/role/GeneralTitleLossesAndRelatedClaimsDetails",
                "shortName":  "General - Title Losses and Related Claims (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "stc:LargeClaimsMinimumThresholdAmount",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R49":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "D2018Q1Jan1_us-gaap_NewAccountingPronouncementEarlyAdoptionAxis_us-gaap_AccountingStandardsUpdate201601Member",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CumulativeEffectOnRetainedEarningsNetOfTax1",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2401404 - Disclosure - General - Investments in Debt and Equity Securities (Details)",
                "role":  "http://www.stewart.com/role/GeneralInvestmentsInDebtAndEquitySecuritiesDetails",
                "shortName":  "General - Investments in Debt and Equity Securities (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  null
                },
            "R5":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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 CASH FLOWS",
                "role":  "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                "shortName":  "CONSOLIDATED STATEMENTS OF CASH FLOWS",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:ProvisionForDoubtfulAccounts",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R50":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "ix:continuation",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD_srt_RangeAxis_srt_MinimumMember_us-gaap_PropertyPlantAndEquipmentByTypeAxis_us-gaap_BuildingMember",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:PropertyPlantAndEquipmentUsefulLife",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2401405 - Disclosure - General - Property and Equipment (Details)",
                "role":  "http://www.stewart.com/role/GeneralPropertyAndEquipmentDetails",
                "shortName":  "General - Property and Equipment (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "ix:continuation",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD_srt_RangeAxis_srt_MinimumMember_us-gaap_PropertyPlantAndEquipmentByTypeAxis_us-gaap_BuildingMember",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:PropertyPlantAndEquipmentUsefulLife",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R51":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ImpairmentOfIntangibleAssetsFinitelived",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2401406 - Disclosure - General - Impairment of Long-lived Assets (Details)",
                "role":  "http://www.stewart.com/role/GeneralImpairmentOfLongLivedAssetsDetails",
                "shortName":  "General - Impairment of Long-lived Assets (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ImpairmentOfIntangibleAssetsFinitelived",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R52":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "ix:continuation",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:NumberOfReportingUnits",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "reporting_unit",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2401407 - Disclosure - General - Goodwill (Details)",
                "role":  "http://www.stewart.com/role/GeneralGoodwillDetails",
                "shortName":  "General - Goodwill (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "ix:continuation",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:NumberOfReportingUnits",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "reporting_unit",
                    "xsiNil":  "false"
                    }
                },
            "R53":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "ix:continuation",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD_srt_RangeAxis_srt_MinimumMember",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:FiniteLivedIntangibleAssetUsefulLife",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2401408 - Disclosure - General - Other Intangibles (Details)",
                "role":  "http://www.stewart.com/role/GeneralOtherIntangiblesDetails",
                "shortName":  "General - Other Intangibles (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "ix:continuation",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD_srt_RangeAxis_srt_MinimumMember",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:FiniteLivedIntangibleAssetUsefulLife",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R54":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "stc:AssetsAndLiabilitiesLesseeTableTextBlock",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeaseRightOfUseAsset",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2401409 - Disclosure - General - Recently Adopted Accounting Pronouncements (Details)",
                "role":  "http://www.stewart.com/role/GeneralRecentlyAdoptedAccountingPronouncementsDetails",
                "shortName":  "General - Recently Adopted Accounting Pronouncements (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "I2019Q1Jan1_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_us-gaap_AccountingStandardsUpdate201602Member",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeaseRightOfUseAsset",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R55":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q3YTD",
                    "decimals":  "-6",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:GainLossOnContractTermination",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2401410 - Disclosure - General - Merger Agreement Termination (Details)",
                "role":  "http://www.stewart.com/role/GeneralMergerAgreementTerminationDetails",
                "shortName":  "General - Merger Agreement Termination (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  null
                },
            "R56":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:RestrictedInvestments",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2402401 - Disclosure - Restrictions on cash and investments (Details)",
                "role":  "http://www.stewart.com/role/RestrictionsOnCashAndInvestmentsDetails",
                "shortName":  "Restrictions on cash and investments (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "stc:RestrictedCashAndInvestmentsTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "us-gaap:RestrictedCashAndCashEquivalents",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R57":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:RestrictionsOnDividendsLoansAndAdvancesTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CashDividendsPaidToParentCompany",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2403401 - Disclosure - Statutory surplus and dividend restrictions (Details)",
                "role":  "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails",
                "shortName":  "Statutory surplus and dividend restrictions (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:RestrictionsOnDividendsLoansAndAdvancesTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "us-gaap:StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R58":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AvailableForSaleSecuritiesDebtSecurities",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2404402 - Disclosure - Investments in debt and equity securities - Investments in Debt and Equity Securities (Details)",
                "role":  "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesInvestmentsInDebtAndEquitySecuritiesDetails",
                "shortName":  "Investments in debt and equity securities - Investments in Debt and Equity Securities (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  null
                },
            "R59":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "stc:EquitySecuritiesAccumulatedUnrealizedGainLoss",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2404403 - Disclosure - Investments in debt and equity securities - Additional Information (Details)",
                "role":  "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails",
                "shortName":  "Investments in debt and equity securities - Additional Information (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "stc:EquitySecuritiesAccumulatedUnrealizedGainLoss",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R6":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2016Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1004000 - Statement - CONSOLIDATED STATEMENTS OF EQUITY",
                "role":  "http://www.stewart.com/role/ConsolidatedStatementsOfEquity",
                "shortName":  "CONSOLIDATED STATEMENTS OF EQUITY",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2016Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R60":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:DebtSecuritiesAvailableForSaleTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2404404 - Disclosure - Investments in debt and equity securities - Amortized Costs and Fair Values (Details)",
                "role":  "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAmortizedCostsAndFairValuesDetails",
                "shortName":  "Investments in debt and equity securities - Amortized Costs and Fair Values (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:DebtSecuritiesAvailableForSaleTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4_us-gaap_FinancialInstrumentAxis_us-gaap_USStatesAndPoliticalSubdivisionsMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:AvailableForSaleDebtSecuritiesAmortizedCostBasis",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R61":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:UnrealizedGainLossOnInvestmentsTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2404405 - Disclosure - Investments in debt and equity securities - Gross Unrealized Gains and Losses (Details)",
                "role":  "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedGainsAndLossesDetails",
                "shortName":  "Investments in debt and equity securities - Gross Unrealized Gains and Losses (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:UnrealizedGainLossOnInvestmentsTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R62":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2404406 - Disclosure - Investments in debt and equity securities - Debt Securities According Contractual Terms (Details)",
                "role":  "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails",
                "shortName":  "Investments in debt and equity securities - Debt Securities According Contractual Terms (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R63":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfTemporaryImpairmentLossesInvestmentsTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2404407 - Disclosure - Investments in debt and equity securities - Gross Unrealized Losses on Investments and Fair Values of Related Securities (Details)",
                "role":  "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails",
                "shortName":  "Investments in debt and equity securities - Gross Unrealized Losses on Investments and Fair Values of Related Securities (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfTemporaryImpairmentLossesInvestmentsTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R64":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:AvailableForSaleSecuritiesDebtSecurities",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2405402 - Disclosure - Fair value measurements (Details)",
                "role":  "http://www.stewart.com/role/FairValueMeasurementsDetails",
                "shortName":  "Fair value measurements (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:FairValueAssetsMeasuredOnRecurringBasisTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4_us-gaap_FairValueByFairValueHierarchyLevelAxis_us-gaap_FairValueInputsLevel1Member",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:EquitySecuritiesFvNi",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R65":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:NetInvestmentIncome",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2406402 - Disclosure - Investment income and net realized and unrealized gains - Income from Investments and Net Realized and Unrealized Gains (Details)",
                "role":  "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails",
                "shortName":  "Investment income and net realized and unrealized gains - Income from Investments and Net Realized and Unrealized Gains (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "stc:RealizedInvestmentGains",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R66":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q3YTD",
                    "decimals":  "-6",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:GainLossOnContractTermination",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2406403 - Disclosure - Investment income and net realized and unrealized gains - Additional Information (Details)",
                "role":  "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsAdditionalInformationDetails",
                "shortName":  "Investment income and net realized and unrealized gains - Additional Information (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "us-gaap:EquitySecuritiesFvNiUnrealizedGain",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R67":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:EquitySecuritiesFvNiGainLoss",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2406404 - Disclosure - Investment income and net realized and unrealized gains - Net Gains (Losses) on Investments in Equity Securities Still Held (Details)",
                "role":  "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsNetGainsLossesOnInvestmentsInEquitySecuritiesStillHeldDetails",
                "shortName":  "Investment income and net realized and unrealized gains - Net Gains (Losses) on Investments in Equity Securities Still Held (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:EquitySecuritiesFvNiGainLoss",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R68":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2406405 - Disclosure - Investment income and net realized and unrealized gains - Proceeds from Sale of Investment (Details)",
                "role":  "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsProceedsFromSaleOfInvestmentDetails",
                "shortName":  "Investment income and net realized and unrealized gains - Proceeds from Sale of Investment (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD_us-gaap_FinancialInstrumentAxis_us-gaap_DebtSecuritiesMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:ProceedsFromSaleOfAvailableForSaleSecuritiesDebt",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R69":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:IncomeTaxDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2017Q4YTD",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2407402 - Disclosure - Income taxes - Additional Information (Details)",
                "role":  "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails",
                "shortName":  "Income taxes - Additional Information (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:IncomeTaxDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2018Q4YTD",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "us-gaap:TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentIncomeTaxExpenseBenefit",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R7":  {
                "firstAnchor":  null,
                "groupType":  "statement",
                "isDefault":  "false",
                "longName":  "1004001 - Statement - CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical)",
                "role":  "http://www.stewart.com/role/ConsolidatedStatementsOfEquityParenthetical",
                "shortName":  "CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical)",
                "subGroupType":  "parenthetical",
                "uniqueAnchor":  null
                },
            "R70":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CurrentFederalTaxExpenseBenefit",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2407403 - Disclosure - Income taxes - Income Tax Expense (Benefit) (Details)",
                "role":  "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails",
                "shortName":  "Income taxes - Income Tax Expense (Benefit) (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CurrentFederalTaxExpenseBenefit",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R71":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.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":  "2407404 - Disclosure - Income taxes - Reconciliation of Income Tax Expenses Computed at Federal Statutory Rate with Income Tax Expense (Details)",
                "role":  "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails",
                "shortName":  "Income taxes - Reconciliation of Income Tax Expenses Computed at Federal Statutory Rate with Income Tax Expense (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R72":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:IncomeTaxDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2017Q4YTD",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2407405 - Disclosure - Income taxes - Reconciliation of Income Tax Expenses Computed at Federal Statutory Rate with Income Tax Expense (Additional Information) (Details)",
                "role":  "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseAdditionalInformationDetails",
                "shortName":  "Income taxes - Reconciliation of Income Tax Expenses Computed at Federal Statutory Rate with Income Tax Expense (Additional Information) (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  null
                },
            "R73":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2407406 - Disclosure - Income taxes - Deferred Tax Assets and Liabilities (Details)",
                "role":  "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails",
                "shortName":  "Income taxes - Deferred Tax Assets and Liabilities (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R74":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2017Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:Goodwill",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2408402 - Disclosure - Goodwill and other intangibles - Summary of Goodwill (Details)",
                "role":  "http://www.stewart.com/role/GoodwillAndOtherIntangiblesSummaryOfGoodwillDetails",
                "shortName":  "Goodwill and other intangibles - Summary of Goodwill (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2018Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:GoodwillWrittenOffRelatedToSaleOfBusinessUnit",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R75":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2018Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:GoodwillAcquiredDuringPeriod",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2408403 - Disclosure - Goodwill and other intangibles - Additional Information (Details)",
                "role":  "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails",
                "shortName":  "Goodwill and other intangibles - Additional Information (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:GoodwillAndIntangibleAssetsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "us-gaap:FiniteLivedIntangibleAssetsGross",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R76":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:EquityMethodInvestmentsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:EquityMethodInvestmentSummarizedFinancialInformationRevenue",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2409402 - Disclosure - Equity investees - Summarized Aggregate Financial Information for Equity Investees (Details)",
                "role":  "http://www.stewart.com/role/EquityInvesteesSummarizedAggregateFinancialInformationForEquityInvesteesDetails",
                "shortName":  "Equity investees - Summarized Aggregate Financial Information for Equity Investees (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:EquityMethodInvestmentsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:EquityMethodInvestmentSummarizedFinancialInformationAssets",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R77":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:EquityMethodInvestmentsDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:EquityMethodInvestmentSummarizedFinancialInformationRevenue",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2409403 - Disclosure - Equity investees - Additional Information (Details)",
                "role":  "http://www.stewart.com/role/EquityInvesteesAdditionalInformationDetails",
                "shortName":  "Equity investees - Additional Information (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-5",
                    "lang":  null,
                    "name":  "stc:EquityMethodInvestmentGoodwill",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R78":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:DebtDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LineOfCredit",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2410402 - Disclosure - Notes payable - Summary of Notes Payable (Details)",
                "role":  "http://www.stewart.com/role/NotesPayableSummaryOfNotesPayableDetails",
                "shortName":  "Notes payable - Summary of Notes Payable (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:DebtDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:OtherLoansPayable",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R79":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:DebtDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2410403 - Disclosure - Notes payable - Additional Information (Details)",
                "role":  "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails",
                "shortName":  "Notes payable - Additional Information (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:DebtDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R8":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2101100 - Disclosure - General",
                "role":  "http://www.stewart.com/role/General",
                "shortName":  "General",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "us-gaap:OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R80":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "stc:EstimatedTitleLossesTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2018Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2411402 - Disclosure - Estimated title losses - Estimated Title Losses (Details)",
                "role":  "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails",
                "shortName":  "Estimated title losses - Estimated Title Losses (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "stc:EstimatedTitleLossesTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2016Q4",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:LiabilityForClaimsAndClaimsAdjustmentExpense",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R81":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "stc:EstimatedTitleLossesTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2018Q4YTD",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "stc:LiabilityforClaimsAndClaimsAdjustmentExpenseIncreaseDecreaseInPriorYearEstimates",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2411403 - Disclosure - Estimated title losses - Additional Information (Details)",
                "role":  "http://www.stewart.com/role/EstimatedTitleLossesAdditionalInformationDetails",
                "shortName":  "Estimated title losses - Additional Information (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "stc:EstimatedTitleLossesTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2018Q4YTD",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "stc:LiabilityforClaimsAndClaimsAdjustmentExpenseIncreaseDecreaseInPriorYearEstimates",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R82":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2413402 - Disclosure - Share-based payments - Additional Information (Details)",
                "role":  "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails",
                "shortName":  "Share-based payments - Additional Information (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R83":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:NonvestedRestrictedStockSharesActivityTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2018Q4_us-gaap_AwardTypeAxis_us-gaap_RestrictedStockMember",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2413403 - Disclosure - Share-based payments - Summary of the Restricted Common Stock Award/Unit Activity (Details)",
                "role":  "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails",
                "shortName":  "Share-based payments - Summary of the Restricted Common Stock Award/Unit Activity (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:NonvestedRestrictedStockSharesActivityTableTextBlock",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2018Q4_us-gaap_AwardTypeAxis_us-gaap_RestrictedStockMember",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    }
                },
            "R84":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfQuarterlyFinancialInformationTableTextBlock",
                        "us-gaap:QuarterlyFinancialInformationTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4QTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:NetIncomeLoss",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2414402 - Disclosure - Earnings per share (Details)",
                "role":  "http://www.stewart.com/role/EarningsPerShareDetails",
                "shortName":  "Earnings per share (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
                        "us-gaap:EarningsPerShareTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:IncrementalCommonSharesAttributableToShareBasedPaymentArrangements",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "shares",
                    "xsiNil":  "false"
                    }
                },
            "R85":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "us-gaap:ReinsuranceTextBlock",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "3",
                    "first":  true,
                    "lang":  null,
                    "name":  "stc:ReinsuranceAssumedRatioOnPremiumIncome",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2415401 - Disclosure - Reinsurance (Details)",
                "role":  "http://www.stewart.com/role/ReinsuranceDetails",
                "shortName":  "Reinsurance (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "us-gaap:ReinsuranceTextBlock",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "3",
                    "first":  true,
                    "lang":  null,
                    "name":  "stc:ReinsuranceAssumedRatioOnPremiumIncome",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "number",
                    "xsiNil":  "false"
                    }
                },
            "R86":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:LesseeOperatingLeasesTextBlock",
                        "us-gaap:LesseeFinanceLeasesTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeaseExpense",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2416402 - Disclosure - Leases - Additional Information (Details)",
                "role":  "http://www.stewart.com/role/LeasesAdditionalInformationDetails",
                "shortName":  "Leases - Additional Information (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:LesseeOperatingLeasesTextBlock",
                        "us-gaap:LesseeFinanceLeasesTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeaseExpense",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R87":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "stc:AssetsAndLiabilitiesLesseeTableTextBlock",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeaseRightOfUseAsset",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2416403 - Disclosure - Leases - Classification of Leases (Details)",
                "role":  "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails",
                "shortName":  "Leases - Classification of Leases (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "stc:AssetsAndLiabilitiesLesseeTableTextBlock",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:FinanceLeaseRightOfUseAsset",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R88":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:LeaseCostTableTextBlock",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeasePayments",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2416404 - Disclosure - Leases - Other Information Related to Leases (Details)",
                "role":  "http://www.stewart.com/role/LeasesOtherInformationRelatedToLeasesDetails",
                "shortName":  "Leases - Other Information Related to Leases (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:LeaseCostTableTextBlock",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeasePayments",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R89":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
                        "us-gaap:FinanceLeaseLiabilityMaturityTableTextBlock",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2416405 - Disclosure - Leases - Future Minimum Lease Payments (Details)",
                "role":  "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails",
                "shortName":  "Leases - Future Minimum Lease Payments (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
                        "us-gaap:FinanceLeaseLiabilityMaturityTableTextBlock",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R9":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "stc:RestrictedCashAndInvestmentsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2102100 - Disclosure - Restrictions on cash and investments",
                "role":  "http://www.stewart.com/role/RestrictionsOnCashAndInvestments",
                "shortName":  "Restrictions on cash and investments",
                "subGroupType":  "",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  null,
                    "first":  true,
                    "lang":  "en-US",
                    "name":  "stc:RestrictedCashAndInvestmentsTextBlock",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  null,
                    "xsiNil":  "false"
                    }
                },
            "R90":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2018Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeasesFutureMinimumPaymentsDueCurrent",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2416406 - Disclosure - Leases - Summary of Future Minimum Lease Payments of Operating Leases (Details)",
                "role":  "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails",
                "shortName":  "Leases - Summary of Future Minimum Lease Payments of Operating Leases (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock",
                        "ix:continuation",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2018Q4",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OperatingLeasesFutureMinimumPaymentsDueCurrent",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R91":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "stc:ContingentLiabilitiesForGuaranteesOfConsolidatedSubsidiariesUnusedLettersofCredit",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2417401 - Disclosure - Contingent liabilities and commitments (Details)",
                "role":  "http://www.stewart.com/role/ContingentLiabilitiesAndCommitmentsDetails",
                "shortName":  "Contingent liabilities and commitments (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:CommitmentsAndContingenciesDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FI2019Q4",
                    "decimals":  "-5",
                    "first":  true,
                    "lang":  null,
                    "name":  "stc:ContingentLiabilitiesForGuaranteesOfConsolidatedSubsidiariesUnusedLettersofCredit",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R92":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:RevenueFromContractWithCustomerTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2419402 - Disclosure - Revenues (Details)",
                "role":  "http://www.stewart.com/role/RevenuesDetails",
                "shortName":  "Revenues (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:RevenueFromContractWithCustomerTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD_srt_ProductOrServiceAxis_stc_TitleInsurancePremiumsDirectMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:RevenueFromContractWithCustomerExcludingAssessedTax",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R93":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:SegmentReportingDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:NumberOfOperatingSegments",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "segment",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2420402 - Disclosure - Segment information - Additional Information (Details)",
                "role":  "http://www.stewart.com/role/SegmentInformationAdditionalInformationDetails",
                "shortName":  "Segment information - Additional Information (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "us-gaap:SegmentReportingDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "INF",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:NumberOfOperatingSegments",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "segment",
                    "xsiNil":  "false"
                    }
                },
            "R94":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfQuarterlyFinancialInformationTableTextBlock",
                        "us-gaap:QuarterlyFinancialInformationTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4QTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:Revenues",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2420403 - Disclosure - Segment information - Selected Statement of Operations and Income (Loss) Information Related to Segments (Details)",
                "role":  "http://www.stewart.com/role/SegmentInformationSelectedStatementOfOperationsAndIncomeLossInformationRelatedToSegmentsDetails",
                "shortName":  "Segment information - Selected Statement of Operations and Income (Loss) Information Related to Segments (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfSegmentReportingInformationBySegmentTextBlock",
                        "us-gaap:SegmentReportingDisclosureTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD_us-gaap_StatementBusinessSegmentsAxis_stc_TitleMember",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:Revenues",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R95":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfQuarterlyFinancialInformationTableTextBlock",
                        "us-gaap:QuarterlyFinancialInformationTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4QTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:Revenues",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2420404 - Disclosure - Segment information - Revenues Generated in Domestic and Foreign Country (Details)",
                "role":  "http://www.stewart.com/role/SegmentInformationRevenuesGeneratedInDomesticAndForeignCountryDetails",
                "shortName":  "Segment information - Revenues Generated in Domestic and Foreign Country (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:RevenueFromExternalCustomersByGeographicAreasTableTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD_srt_StatementGeographicalAxis_country_US",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:Revenues",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R96":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ComprehensiveIncomeNoteTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OtherComprehensiveIncomeLossBeforeTax",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2421402 - Disclosure - Other comprehensive income (loss) (Details)",
                "role":  "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails",
                "shortName":  "Other comprehensive income (loss) (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "ix:continuation",
                        "us-gaap:ComprehensiveIncomeNoteTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OtherComprehensiveIncomeLossBeforeTax",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R97":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "us-gaap:ScheduleOfQuarterlyFinancialInformationTableTextBlock",
                        "us-gaap:QuarterlyFinancialInformationTextBlock",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4QTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:Revenues",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "disclosure",
                "isDefault":  "false",
                "longName":  "2422402 - Disclosure - Quarterly financial information (unaudited) (Details)",
                "role":  "http://www.stewart.com/role/QuarterlyFinancialInformationUnauditedDetails",
                "shortName":  "Quarterly financial information (unaudited) (Details)",
                "subGroupType":  "details",
                "uniqueAnchor":  null
                },
            "R98":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "ix:continuation",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q3YTD",
                    "decimals":  "-6",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:GainLossOnContractTermination",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "",
                "isDefault":  "false",
                "longName":  "2443401 - Schedule - Schedule I - Financial Information of the Registrant (Parent Company) - Statements of Income and Retained Earnings (Details)",
                "role":  "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails",
                "shortName":  "Schedule I - Financial Information of the Registrant (Parent Company) - Statements of Income and Retained Earnings (Details)",
                "subGroupType":  "parenthetical",
                "uniqueAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "I2018Q1Jan1",
                    "decimals":  "-3",
                    "lang":  null,
                    "name":  "us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption",
                    "reportCount":  1,
                    "unique":  true,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    }
                },
            "R99":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "FD2019Q4YTD",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:OtherCostAndExpenseOperating",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "",
                "isDefault":  "false",
                "longName":  "2443402 - Schedule - Schedule I - Financial Information of the Registrant (Parent Company) - Statements of Income and Retained Earnings, Additional Information (Details)",
                "role":  "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsAdditionalInformationDetails",
                "shortName":  "Schedule I - Financial Information of the Registrant (Parent Company) - Statements of Income and Retained Earnings, Additional Information (Details)",
                "subGroupType":  "parenthetical",
                "uniqueAnchor":  null
                },
            "R9999":  {
                "firstAnchor":  {
                    "ancestors":  [
                        "span",
                        "span",
                        "div",
                        "td",
                        "tr",
                        "table",
                        "div",
                        "div",
                        "div",
                        "body",
                        "html"
                        ],
                    "baseRef":  "stewart201910-k.htm",
                    "contextRef":  "I2018Q1Jan1_us-gaap_StatementEquityComponentsAxis_us-gaap_AccumulatedOtherComprehensiveIncomeMember",
                    "decimals":  "-3",
                    "first":  true,
                    "lang":  null,
                    "name":  "us-gaap:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption",
                    "reportCount":  1,
                    "unitRef":  "usd",
                    "xsiNil":  "false"
                    },
                "groupType":  "",
                "isDefault":  "false",
                "longName":  "Uncategorized Items - stewart201910-k.htm",
                "role":  "http://xbrl.sec.gov/role/uncategorizedFacts",
                "shortName":  "Uncategorized Items - stewart201910-k.htm",
                "subGroupType":  "",
                "uniqueAnchor":  null
                }
            },
        "segmentCount":  66,
        "tag":  {
            "country_CA":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "CANADA",
                            "terseLabel":  "Canada"
                            }
                        }
                    },
                "localname":  "CA",
                "nsuri":  "http://xbrl.sec.gov/country/2017-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "country_GB":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "UNITED KINGDOM",
                            "terseLabel":  "United Kingdom"
                            }
                        }
                    },
                "localname":  "GB",
                "nsuri":  "http://xbrl.sec.gov/country/2017-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "country_US":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "UNITED STATES",
                            "terseLabel":  "United States"
                            }
                        }
                    },
                "localname":  "US",
                "nsuri":  "http://xbrl.sec.gov/country/2017-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/SegmentInformationRevenuesGeneratedInDomesticAndForeignCountryDetails"
                    ],
                "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.stewart.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.stewart.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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "gMonthDayItemType"
                },
            "dei_DocumentAnnualReport":  {
                "auth_ref":  [
                    "r492"
                    ],
                "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.stewart.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"
                            }
                        }
                    },
                "localname":  "DocumentFiscalPeriodFocus",
                "nsuri":  "http://xbrl.sec.gov/dei/2019-01-31",
                "presentation":  [
                    "http://www.stewart.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.stewart.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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "dateItemType"
                },
            "dei_DocumentTransitionReport":  {
                "auth_ref":  [
                    "r491"
                    ],
                "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.stewart.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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "submissionTypeItemType"
                },
            "dei_DocumentsIncorporatedByReferenceTextBlock":  {
                "auth_ref":  [
                    "r489"
                    ],
                "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.stewart.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.stewart.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.stewart.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.stewart.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.stewart.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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "stateOrProvinceItemType"
                },
            "dei_EntityCentralIndexKey":  {
                "auth_ref":  [
                    "r493"
                    ],
                "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.stewart.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.stewart.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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "dei_EntityEmergingGrowthCompany":  {
                "auth_ref":  [
                    "r493"
                    ],
                "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.stewart.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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "fileNumberItemType"
                },
            "dei_EntityFilerCategory":  {
                "auth_ref":  [
                    "r493"
                    ],
                "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.stewart.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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "edgarStateCountryItemType"
                },
            "dei_EntityInteractiveDataCurrent":  {
                "auth_ref":  [
                    "r494"
                    ],
                "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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "dei_EntityRegistrantName":  {
                "auth_ref":  [
                    "r493"
                    ],
                "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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_EntityShellCompany":  {
                "auth_ref":  [
                    "r493"
                    ],
                "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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntitySmallBusiness":  {
                "auth_ref":  [
                    "r493"
                    ],
                "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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "booleanItemType"
                },
            "dei_EntityTaxIdentificationNumber":  {
                "auth_ref":  [
                    "r493"
                    ],
                "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.stewart.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.stewart.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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "yesNoItemType"
                },
            "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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "normalizedStringItemType"
                },
            "dei_Security12bTitle":  {
                "auth_ref":  [
                    "r488"
                    ],
                "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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "securityTitleItemType"
                },
            "dei_SecurityExchangeName":  {
                "auth_ref":  [
                    "r490"
                    ],
                "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.stewart.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.stewart.com/role/CoverPage"
                    ],
                "xbrltype":  "tradingSymbolItemType"
                },
            "srt_AffiliatedEntityMember":  {
                "auth_ref":  [
                    "r267",
                    "r392",
                    "r394",
                    "r487",
                    "r497"
                    ],
                "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":  "Affiliates"
                            }
                        }
                    },
                "localname":  "AffiliatedEntityMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_CondensedBalanceSheetStatementTable":  {
                "auth_ref":  [
                    "r118",
                    "r329",
                    "r499"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about condensed balance sheet, including, but not limited to, balance sheets of consolidated entities and consolidation eliminations.",
                            "label":  "Condensed Balance Sheet Statement [Table]",
                            "terseLabel":  "Condensed Balance Sheet Statement [Table]"
                            }
                        }
                    },
                "localname":  "CondensedBalanceSheetStatementTable",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_CondensedBalanceSheetStatementsCaptionsLineItems":  {
                "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":  "Condensed Balance Sheet Statements, Captions [Line Items]",
                            "terseLabel":  "Condensed Balance Sheet Statements, Captions [Line Items]"
                            }
                        }
                    },
                "localname":  "CondensedBalanceSheetStatementsCaptionsLineItems",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_CondensedCashFlowStatementTable":  {
                "auth_ref":  [
                    "r118",
                    "r329",
                    "r500"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about condensed cash flow statement, including, but not limited to, cash flow statements of consolidated entities and consolidation eliminations.",
                            "label":  "Condensed Cash Flow Statement [Table]",
                            "terseLabel":  "Condensed Cash Flow Statement [Table]"
                            }
                        }
                    },
                "localname":  "CondensedCashFlowStatementTable",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_CondensedCashFlowStatementsCaptionsLineItems":  {
                "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":  "Condensed Cash Flow Statements, Captions [Line Items]",
                            "terseLabel":  "Condensed Cash Flow Statements, Captions [Line Items]"
                            }
                        }
                    },
                "localname":  "CondensedCashFlowStatementsCaptionsLineItems",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Condensed Financial Information Disclosure [Abstract]"
                            }
                        }
                    },
                "localname":  "CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "srt_CondensedFinancialStatementsCaptionsLineItems":  {
                "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":  "Condensed Financial Statements, Captions [Line Items]",
                            "terseLabel":  "Condensed Financial Statements, Captions [Line Items]"
                            }
                        }
                    },
                "localname":  "CondensedFinancialStatementsCaptionsLineItems",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_CondensedIncomeStatementTable":  {
                "auth_ref":  [
                    "r118",
                    "r329",
                    "r500"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about condensed income statement including, but not limited to, income statements of consolidated entities and consolidation eliminations.",
                            "label":  "Condensed Income Statement [Table]",
                            "terseLabel":  "Condensed Income Statement [Table]"
                            }
                        }
                    },
                "localname":  "CondensedIncomeStatementTable",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_CondensedIncomeStatementsCaptionsLineItems":  {
                "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":  "Condensed Income Statements, Captions [Line Items]",
                            "terseLabel":  "Schedule of Condensed Consolidating Statement of Operations [Line Items]"
                            }
                        }
                    },
                "localname":  "CondensedIncomeStatementsCaptionsLineItems",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_ConsolidatedEntitiesAxis":  {
                "auth_ref":  [
                    "r487",
                    "r497"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by consolidated entity or group of entities.",
                            "label":  "Consolidated Entities [Axis]",
                            "terseLabel":  "Consolidated Entities [Axis]"
                            }
                        }
                    },
                "localname":  "ConsolidatedEntitiesAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheetsParenthetical",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_ConsolidatedEntitiesDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Entity or group of entities consolidated into reporting entity.",
                            "label":  "Consolidated Entities [Domain]",
                            "terseLabel":  "Consolidated Entities [Domain]"
                            }
                        }
                    },
                "localname":  "ConsolidatedEntitiesDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheetsParenthetical",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_DirectorMember":  {
                "auth_ref":  [
                    "r157"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Person serving on board of directors.",
                            "label":  "Director [Member]",
                            "terseLabel":  "Director"
                            }
                        }
                    },
                "localname":  "DirectorMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "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.stewart.com/role/GeneralOtherIntangiblesDetails",
                    "http://www.stewart.com/role/GeneralPropertyAndEquipmentDetails",
                    "http://www.stewart.com/role/GeneralTitleLossesAndRelatedClaimsDetails",
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails",
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "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.stewart.com/role/GeneralOtherIntangiblesDetails",
                    "http://www.stewart.com/role/GeneralPropertyAndEquipmentDetails",
                    "http://www.stewart.com/role/GeneralTitleLossesAndRelatedClaimsDetails",
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails",
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ParentCompanyMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The registrant that controls, directly or indirectly, another entity (or entities).  The usual condition for control is ownership of a majority (over 50%) of the outstanding voting stock.  The power to control may also exist with a lesser percentage of ownership, for example, by contract, lease, agreement with other stockholders or by court decree.",
                            "label":  "Parent Company [Member]",
                            "terseLabel":  "Parent Company"
                            }
                        }
                    },
                "localname":  "ParentCompanyMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ProductOrServiceAxis":  {
                "auth_ref":  [
                    "r153",
                    "r260",
                    "r261",
                    "r466",
                    "r467"
                    ],
                "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.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/EquityInvesteesAdditionalInformationDetails",
                    "http://www.stewart.com/role/RevenuesDetails"
                    ],
                "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.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/EquityInvesteesAdditionalInformationDetails",
                    "http://www.stewart.com/role/RevenuesDetails"
                    ],
                "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.stewart.com/role/GeneralOtherIntangiblesDetails",
                    "http://www.stewart.com/role/GeneralPropertyAndEquipmentDetails",
                    "http://www.stewart.com/role/GeneralTitleLossesAndRelatedClaimsDetails",
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails",
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "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.stewart.com/role/GeneralOtherIntangiblesDetails",
                    "http://www.stewart.com/role/GeneralPropertyAndEquipmentDetails",
                    "http://www.stewart.com/role/GeneralTitleLossesAndRelatedClaimsDetails",
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails",
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ScenarioForecastMember":  {
                "auth_ref":  [
                    "r495"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information reported for future period.",
                            "label":  "Forecast [Member]",
                            "terseLabel":  "Scenario, Forecast"
                            }
                        }
                    },
                "localname":  "ScenarioForecastMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ScenarioUnspecifiedDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Scenario reported, distinguishing information from actual fact.  Includes, but is not limited to, pro forma and forecast.  Excludes actual facts.",
                            "label":  "Scenario [Domain]",
                            "terseLabel":  "Scenario [Domain]"
                            }
                        }
                    },
                "localname":  "ScenarioUnspecifiedDomain",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_ScheduleOfCondensedFinancialStatementsTable":  {
                "auth_ref":  [
                    "r118",
                    "r329",
                    "r500",
                    "r502",
                    "r503",
                    "r504"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about condensed financial statements, including, but not limited to, the balance sheet, income statement, and statement of cash flows.",
                            "label":  "Condensed Financial Statements [Table]",
                            "terseLabel":  "Condensed Financial Statements [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfCondensedFinancialStatementsTable",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_ScheduleOfValuationAndQualifyingAccountsDisclosureTextBlock":  {
                "auth_ref":  [
                    "r123",
                    "r501"
                    ],
                "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.stewart.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.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails",
                    "http://www.stewart.com/role/SegmentInformationRevenuesGeneratedInDomesticAndForeignCountryDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_StatementGeographicalAxis":  {
                "auth_ref":  [
                    "r155",
                    "r260",
                    "r262",
                    "r468",
                    "r482",
                    "r486",
                    "r496",
                    "r498"
                    ],
                "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.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails",
                    "http://www.stewart.com/role/SegmentInformationRevenuesGeneratedInDomesticAndForeignCountryDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_StatementScenarioAxis":  {
                "auth_ref":  [
                    "r237",
                    "r395"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by scenario reported, distinguishing information from actual fact.  Includes, but is not limited to, pro forma and forecast.  Excludes actual facts.",
                            "label":  "Scenario [Axis]",
                            "terseLabel":  "Scenario [Axis]"
                            }
                        }
                    },
                "localname":  "StatementScenarioAxis",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_SubsidiariesMember":  {
                "auth_ref":  [
                    "r267",
                    "r392",
                    "r394"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Entity owned or controlled by another entity.",
                            "label":  "Subsidiaries [Member]",
                            "terseLabel":  "Subsidiaries"
                            }
                        }
                    },
                "localname":  "SubsidiariesMember",
                "nsuri":  "http://fasb.org/srt/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheetsParenthetical"
                    ],
                "xbrltype":  "domainItemType"
                },
            "srt_TitleOfIndividualAxis":  {
                "auth_ref":  [
                    "r157",
                    "r393"
                    ],
                "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.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "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.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "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.stewart.com/role/ScheduleIiValuationAndQualifyingAccountsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "srt_ValuationAndQualifyingAccountsDisclosureTable":  {
                "auth_ref":  [
                    "r123",
                    "r501"
                    ],
                "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.stewart.com/role/ScheduleIiValuationAndQualifyingAccountsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "stc_AdjustmentsForInsuranceRecoveriesOfTitleLosses":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Adjustments For Insurance Recoveries Of Title Losses",
                            "label":  "Adjustments For Insurance Recoveries Of Title Losses",
                            "terseLabel":  "Adjustments for insurance recoveries of title losses"
                            }
                        }
                    },
                "localname":  "AdjustmentsForInsuranceRecoveriesOfTitleLosses",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_AncillaryServicesAndCorporateMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Ancillary Services and Corporate",
                            "label":  "Ancillary Services And Corporate [Member]",
                            "terseLabel":  "Ancillary Services and Corporate",
                            "verboseLabel":  "Ancillary services and corporate segment"
                            }
                        }
                    },
                "localname":  "AncillaryServicesAndCorporateMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesSummaryOfGoodwillDetails",
                    "http://www.stewart.com/role/SegmentInformationSelectedStatementOfOperationsAndIncomeLossInformationRelatedToSegmentsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_AncillaryServicesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Ancillary Services [Member]",
                            "label":  "Ancillary Services [Member]",
                            "terseLabel":  "Ancillary services"
                            }
                        }
                    },
                "localname":  "AncillaryServicesMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_AssetsAndLiabilitiesLesseeTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Assets And Liabilities, Lessee [Table Text Block]",
                            "label":  "Assets And Liabilities, Lessee [Table Text Block]",
                            "terseLabel":  "Schedule of lease-related assets and liabilities"
                            }
                        }
                    },
                "localname":  "AssetsAndLiabilitiesLesseeTableTextBlock",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "stc_ContingentLiabilitiesForGuaranteesOfConsolidatedSubsidiariesUnusedLettersofCredit":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Contingent liabilities for guarantees of consolidated subsidiaries, unused letters of credit.",
                            "label":  "Contingent Liabilities For Guarantees Of Consolidated Subsidiaries, Unused Letters of Credit",
                            "terseLabel":  "Guarantee of indebtedness, relating to unused letters of credit"
                            }
                        }
                    },
                "localname":  "ContingentLiabilitiesForGuaranteesOfConsolidatedSubsidiariesUnusedLettersofCredit",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ContingentLiabilitiesAndCommitmentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_DebtInstrumentCovenantAggregateAnnualCapitalExpenditures":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt Instrument, Covenant, Aggregate Annual Capital Expenditures",
                            "label":  "Debt Instrument, Covenant, Aggregate Annual Capital Expenditures",
                            "terseLabel":  "Aggregate annual capital expenditures allowed"
                            }
                        }
                    },
                "localname":  "DebtInstrumentCovenantAggregateAnnualCapitalExpenditures",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_DebtInstrumentCovenantRatioOfEBITDAToFixedChargesMinimum":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt Instrument, Covenant, Ratio Of EBITDA To Fixed Charges, Minimum",
                            "label":  "Debt Instrument, Covenant, Ratio Of EBITDA To Fixed Charges, Minimum",
                            "terseLabel":  "Fixed charge ratio, minimum"
                            }
                        }
                    },
                "localname":  "DebtInstrumentCovenantRatioOfEBITDAToFixedChargesMinimum",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "pureItemType"
                },
            "stc_DebtInstrumentCovenantRatioOfTotalIndebtednessToEBITDAMaximum":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt Instrument, Covenant, Ratio Of Total Indebtedness To EBITDA, Maximum",
                            "label":  "Debt Instrument, Covenant, Ratio Of Total Indebtedness To EBITDA, Maximum",
                            "terseLabel":  "Leverage ratio, maximum"
                            }
                        }
                    },
                "localname":  "DebtInstrumentCovenantRatioOfTotalIndebtednessToEBITDAMaximum",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "pureItemType"
                },
            "stc_DebtInstrumentRestrictiveCovenantsAnnualDividendPayments":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt Instrument, Restrictive Covenants, Annual Dividend Payments",
                            "label":  "Debt Instrument, Restrictive Covenants, Annual Dividend Payments",
                            "terseLabel":  "Annual dividend payments allowed"
                            }
                        }
                    },
                "localname":  "DebtInstrumentRestrictiveCovenantsAnnualDividendPayments",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_DeferredTaxAssetsFederalOffsettoCanadianDeferredTaxLiability":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Deferred Tax Assets, Federal Offset to Canadian Deferred Tax Liability",
                            "label":  "Deferred Tax Assets, Federal Offset to Canadian Deferred Tax Liability",
                            "terseLabel":  "Federal offset to Canadian deferred tax liability"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsFederalOffsettoCanadianDeferredTaxLiability",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_DeferredTaxLiabilitiesInsurance":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_DeferredIncomeTaxLiabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Deferred Tax Liabilities Insurance",
                            "label":  "Deferred Tax Liabilities Insurance",
                            "negatedLabel":  "Deferred compensation on life insurance policies"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilitiesInsurance",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_EntityWideRevenueMajorBusinessSegmentPercentage":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Entity Wide Revenue Major Business Segment Percentage",
                            "label":  "Entity Wide Revenue Major Business Segment Percentage",
                            "terseLabel":  "Revenue major segments percentage"
                            }
                        }
                    },
                "localname":  "EntityWideRevenueMajorBusinessSegmentPercentage",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralGeneralDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "stc_EquityMethodInvestmentGoodwill":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Equity Method Investment, Goodwill",
                            "label":  "Equity Method Investment, Goodwill",
                            "verboseLabel":  "Goodwill related to equity investees"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestmentGoodwill",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/EquityInvesteesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_EquitySecuritiesAccumulatedUnrealizedGainLoss":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Equity Securities, Accumulated Unrealized Gain (Loss)",
                            "label":  "Equity Securities, Accumulated Unrealized Gain (Loss)",
                            "terseLabel":  "Net unrealized investment gains on equity securities held"
                            }
                        }
                    },
                "localname":  "EquitySecuritiesAccumulatedUnrealizedGainLoss",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_EscrowAccountDepositMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Escrow Account Deposit [Member]",
                            "label":  "Escrow Account Deposit [Member]",
                            "terseLabel":  "Escrow Account Deposit"
                            }
                        }
                    },
                "localname":  "EscrowAccountDepositMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ContingentLiabilitiesAndCommitmentsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_EscrowAccountDepositSection1031ExchangeMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Escrow Account Deposit - Section 1031 Exchange [Member]",
                            "label":  "Escrow Account Deposit - Section 1031 Exchange [Member]",
                            "terseLabel":  "Escrow Account Deposit - Section 1031 Exchange"
                            }
                        }
                    },
                "localname":  "EscrowAccountDepositSection1031ExchangeMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ContingentLiabilitiesAndCommitmentsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_EscrowFeesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Escrow Fees [Member]",
                            "label":  "Escrow Fees [Member]",
                            "terseLabel":  "Escrow fees"
                            }
                        }
                    },
                "localname":  "EscrowFeesMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/RevenuesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_EstimatedTitleLossesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Estimated Title Losses [Member]",
                            "label":  "Estimated Title Losses [Member]",
                            "terseLabel":  "Estimated title losses"
                            }
                        }
                    },
                "localname":  "EstimatedTitleLossesMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIiValuationAndQualifyingAccountsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_EstimatedTitleLossesTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Estimated Title Losses.",
                            "label":  "Estimated Title Losses [Text Block]",
                            "terseLabel":  "Estimated title losses"
                            }
                        }
                    },
                "localname":  "EstimatedTitleLossesTextBlock",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLosses"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "stc_FinanceLeaseCost":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Finance Lease, Cost",
                            "label":  "Finance Lease, Cost",
                            "terseLabel":  "Total finance lease expense"
                            }
                        }
                    },
                "localname":  "FinanceLeaseCost",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_GoodwillAcquiredDisposedofDuringPeriod":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Goodwill acquired.",
                            "label":  "Goodwill, Acquired (Disposed of) During Period",
                            "terseLabel":  "Goodwill acquired"
                            }
                        }
                    },
                "localname":  "GoodwillAcquiredDisposedofDuringPeriod",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_InsurancePolicyPolicyTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Insurance Policy",
                            "label":  "Insurance Policy [Policy Text Block]",
                            "terseLabel":  "Title plants"
                            }
                        }
                    },
                "localname":  "InsurancePolicyPolicyTextBlock",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "stc_InvestmentAndOtherGainsLossesNetAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Investment And Other Gains (Losses), Net [Abstract]",
                            "label":  "Investment And Other Gains (Losses), Net [Abstract]",
                            "terseLabel":  "Net realized and unrealized gains:"
                            }
                        }
                    },
                "localname":  "InvestmentAndOtherGainsLossesNetAbstract",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "stc_InvestmentsInDebtAndEquitySecurities":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  9.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesInvestmentsInDebtAndEquitySecuritiesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Investments In Debt And Equity Securities",
                            "label":  "Investments In Debt And Equity Securities",
                            "totalLabel":  "Investments in debt and equity securities"
                            }
                        }
                    },
                "localname":  "InvestmentsInDebtAndEquitySecurities",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/FairValueMeasurementsDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesInvestmentsInDebtAndEquitySecuritiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_LargeClaimsMinimumThresholdAmount":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Large Claims, Minimum Threshold, Amount",
                            "label":  "Large Claims, Minimum Threshold, Amount",
                            "terseLabel":  "Threshold amount for large claims"
                            }
                        }
                    },
                "localname":  "LargeClaimsMinimumThresholdAmount",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralTitleLossesAndRelatedClaimsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_LeaseLiability":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Lease, Liability",
                            "label":  "Lease, Liability",
                            "totalLabel":  "Total lease liabilities"
                            }
                        }
                    },
                "localname":  "LeaseLiability",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_LeaseRightOfUseAsset":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Lease, Right-Of-Use Asset",
                            "label":  "Lease, Right-Of-Use Asset",
                            "totalLabel":  "Total lease assets"
                            }
                        }
                    },
                "localname":  "LeaseRightOfUseAsset",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_LiabilityforClaimsAndClaimsAdjustmentExpenseEffectsOfChangesInForeignCurrencyExchangeRates":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Liability for Claims And Claims Adjustment Expense, Effects Of Changes In Foreign Currency Exchange Rates",
                            "label":  "Liability for Claims And Claims Adjustment Expense, Effects Of Changes In Foreign Currency Exchange Rates",
                            "negatedTerseLabel":  "Effects of changes in foreign currency exchange rates"
                            }
                        }
                    },
                "localname":  "LiabilityforClaimsAndClaimsAdjustmentExpenseEffectsOfChangesInForeignCurrencyExchangeRates",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_LiabilityforClaimsAndClaimsAdjustmentExpenseIncreaseDecreaseInPriorYearEstimates":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Liability for Claims And Claims Adjustment Expense, Increase (Decrease) In Prior Year Estimates",
                            "label":  "Liability for Claims And Claims Adjustment Expense, Increase (Decrease) In Prior Year Estimates",
                            "negatedLabel":  "Reduction in prior policy year reserve"
                            }
                        }
                    },
                "localname":  "LiabilityforClaimsAndClaimsAdjustmentExpenseIncreaseDecreaseInPriorYearEstimates",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_LiabilityforClaimsAndClaimsAdjustmentExpenseLossRatioinPercentageCurrentYearEstimatedLoss":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Liability for Claims And Claims Adjustment Expense, Loss Ratio in Percentage, Current Year Estimated Loss",
                            "label":  "Liability for Claims And Claims Adjustment Expense, Loss Ratio in Percentage, Current Year Estimated Loss",
                            "terseLabel":  "Current year provisions"
                            }
                        }
                    },
                "localname":  "LiabilityforClaimsAndClaimsAdjustmentExpenseLossRatioinPercentageCurrentYearEstimatedLoss",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "stc_LiabilityforClaimsAndClaimsAdjustmentExpenseProvisionIncreaseDecrease":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Liability for Claims And Claims Adjustment Expense, Provision, Increase (Decrease)",
                            "label":  "Liability for Claims And Claims Adjustment Expense, Provision, Increase (Decrease)",
                            "terseLabel":  "Total provisions related to prior policy years"
                            }
                        }
                    },
                "localname":  "LiabilityforClaimsAndClaimsAdjustmentExpenseProvisionIncreaseDecrease",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_LineOfCreditAccordionFeatureIncreaseInMaximumBorrowingCapacity":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Line Of Credit, Accordion Feature, Increase In Maximum Borrowing Capacity",
                            "label":  "Line Of Credit, Accordion Feature, Increase In Maximum Borrowing Capacity",
                            "terseLabel":  "Line of credit, conditional increase in maximum borrowing capacity"
                            }
                        }
                    },
                "localname":  "LineOfCreditAccordionFeatureIncreaseInMaximumBorrowingCapacity",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_LossAdjustmentsPriorYearEstimatesProvisionsForLargeTitleClaimsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Loss Adjustments, Prior Year Estimates, Provisions For Large Title Claims [Member]",
                            "label":  "Loss Adjustments, Prior Year Estimates, Provisions For Large Title Claims [Member]",
                            "terseLabel":  "Large Title Claims"
                            }
                        }
                    },
                "localname":  "LossAdjustmentsPriorYearEstimatesProvisionsForLargeTitleClaimsMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_LossContingencyAccrualPaymentsNetofRecoveriesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Loss Contingency Accrual, Payments Net of Recoveries [Abstract]",
                            "label":  "Loss Contingency Accrual, Payments Net of Recoveries [Abstract]",
                            "terseLabel":  "Payments, net of recoveries:"
                            }
                        }
                    },
                "localname":  "LossContingencyAccrualPaymentsNetofRecoveriesAbstract",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "stc_LossContingencyAccrualProvisionsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Loss Contingency Accrual, Provisions [Abstract]",
                            "label":  "Loss Contingency Accrual, Provisions [Abstract]",
                            "terseLabel":  "Provisions:"
                            }
                        }
                    },
                "localname":  "LossContingencyAccrualProvisionsAbstract",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "stc_NetIncomeLossFromSubsidiaries":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NetIncomeLoss",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Net Income Loss From Subsidiaries",
                            "label":  "Net Income Loss From Subsidiaries",
                            "verboseLabel":  "Income from subsidiaries"
                            }
                        }
                    },
                "localname":  "NetIncomeLossFromSubsidiaries",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquiredDisposedOf":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Noncash Or Part Noncash Acquisition, Intangible Assets Acquired (Disposed Of)",
                            "label":  "Noncash Or Part Noncash Acquisition, Intangible Assets Acquired (Disposed Of)",
                            "terseLabel":  "Intangible assets acquired"
                            }
                        }
                    },
                "localname":  "NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquiredDisposedOf",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumedDisposed":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Noncash Or Part Noncash Acquisition, Other Liabilities Assumed (Disposed)",
                            "label":  "Noncash Or Part Noncash Acquisition, Other Liabilities Assumed (Disposed)",
                            "negatedLabel":  "Liabilities (recognized) disposed"
                            }
                        }
                    },
                "localname":  "NoncashOrPartNoncashAcquisitionOtherLiabilitiesAssumedDisposed",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_OtherInvestingActivitiesNet":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Other Investing Activities Net",
                            "label":  "Other Investing Activities Net",
                            "terseLabel":  "Other \u2013 net"
                            }
                        }
                    },
                "localname":  "OtherInvestingActivitiesNet",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_OtherInvestmentsInDebtAndEquitySecuritiesAvailableForSale":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "stc_InvestmentsInDebtAndEquitySecurities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Other investments in debt and equity securities available for sale.",
                            "label":  "Other Investments In Debt And Equity Securities Available For Sale",
                            "terseLabel":  "Other"
                            }
                        }
                    },
                "localname":  "OtherInvestmentsInDebtAndEquitySecuritiesAvailableForSale",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_PercentageAllowanceOnLosses":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Percentage Allowance on Losses",
                            "label":  "Percentage Allowance On Losses",
                            "terseLabel":  "Total provisions"
                            }
                        }
                    },
                "localname":  "PercentageAllowanceOnLosses",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "stc_RealizedAndUnrealizedInvestmentGainsLossesNet":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Realized And Unrealized Investment Gains (Losses), Net",
                            "label":  "Realized And Unrealized Investment Gains (Losses), Net",
                            "negatedLabel":  "Net realized and unrealized losses (gains)"
                            }
                        }
                    },
                "localname":  "RealizedAndUnrealizedInvestmentGainsLossesNet",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_RealizedInvestmentGains":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_OtherNonoperatingGainsLosses",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Realized Investment Gains",
                            "label":  "Realized Investment Gains",
                            "terseLabel":  "Realized gains"
                            }
                        }
                    },
                "localname":  "RealizedInvestmentGains",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_RealizedInvestmentLosses":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_OtherNonoperatingGainsLosses",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Realized Investment Losses",
                            "label":  "Realized Investment Losses",
                            "negatedLabel":  "Realized losses"
                            }
                        }
                    },
                "localname":  "RealizedInvestmentLosses",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_ReceivablesAndOtherAssetsAcquisitionsDisposals":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Receivables And Other Assets, Acquisitions (Disposals)",
                            "label":  "Receivables And Other Assets, Acquisitions (Disposals)",
                            "negatedTerseLabel":  "Receivables and other assets acquired (disposed)"
                            }
                        }
                    },
                "localname":  "ReceivablesAndOtherAssetsAcquisitionsDisposals",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_ReinsuranceAssumedRatioOnPremiumIncome":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Reinsurance Assumed Ratio On Premium Income",
                            "label":  "Reinsurance Assumed Ratio On Premium Income",
                            "terseLabel":  "Total amount of premiums for assumed and ceded risks as a percentage of consolidated title revenue (less than)"
                            }
                        }
                    },
                "localname":  "ReinsuranceAssumedRatioOnPremiumIncome",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ReinsuranceDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "stc_ReserveAmountThresholdRangePercentage":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Reserve Amount, Threshold Range, Percentage",
                            "label":  "Reserve Amount, Threshold Range, Percentage",
                            "terseLabel":  "Reserve amount, threshold percentage"
                            }
                        }
                    },
                "localname":  "ReserveAmountThresholdRangePercentage",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralTitleLossesAndRelatedClaimsDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "stc_ReserveForTitleLossesLineItems":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "[Line Items] for Reserve For Title Losses [Table]",
                            "label":  "Reserve For Title Losses [Line Items]",
                            "terseLabel":  "Reserve for Title Losses [Line Items]"
                            }
                        }
                    },
                "localname":  "ReserveForTitleLossesLineItems",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralTitleLossesAndRelatedClaimsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "stc_ReserveForTitleLossesTable":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Reserve For Title Losses [Table]",
                            "label":  "Reserve For Title Losses [Table]",
                            "terseLabel":  "Reserve For Title Losses [Table]"
                            }
                        }
                    },
                "localname":  "ReserveForTitleLossesTable",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralTitleLossesAndRelatedClaimsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "stc_RestrictedCashAndInvestmentsTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Restricted Cash and Investments [Text Block]",
                            "label":  "Restricted Cash And Investments [Text Block]",
                            "terseLabel":  "Restrictions on cash and investments"
                            }
                        }
                    },
                "localname":  "RestrictedCashAndInvestmentsTextBlock",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/RestrictionsOnCashAndInvestments"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "stc_RestrictedStockAndRestrictedStockUnitsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Restricted Stock And Restricted Stock Units [Member]",
                            "label":  "Restricted Stock And Restricted Stock Units [Member]",
                            "terseLabel":  "Restricted Stock and Restricted Stock Units"
                            }
                        }
                    },
                "localname":  "RestrictedStockAndRestrictedStockUnitsMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_RetainedEarningsRollForward":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Retained Earnings [Roll Forward]",
                            "label":  "Retained Earnings [Roll Forward]",
                            "terseLabel":  "Retained Earnings [Roll Forward]"
                            }
                        }
                    },
                "localname":  "RetainedEarningsRollForward",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "stc_SearchAbstractAndValuationServicesMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Search, Abstract And Valuation Services [Member]",
                            "label":  "Search, Abstract And Valuation Services [Member]",
                            "terseLabel":  "Search, abstract and valuation services"
                            }
                        }
                    },
                "localname":  "SearchAbstractAndValuationServicesMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/RevenuesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedOtherAdjustments":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Nonvested, Other Adjustments",
                            "label":  "Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Nonvested, Other Adjustments",
                            "negatedTerseLabel":  "Adjustment for performance-based shares (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedOtherAdjustments",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "stc_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOtherAdjustmentsWeightedAverageGrantDateFairValue":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Other Adjustments, Weighted Average Grant Date Fair Value",
                            "label":  "Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Other Adjustments, Weighted Average Grant Date Fair Value",
                            "terseLabel":  "Adjustment for performance-based shares (in usd per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOtherAdjustmentsWeightedAverageGrantDateFairValue",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "stc_ShortTermInvestmentsPolicyPolicyTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Short Term Investments , Policy [Text Block]",
                            "label":  "Short Term Investments Policy [Policy Text Block]",
                            "terseLabel":  "Short-term investments"
                            }
                        }
                    },
                "localname":  "ShortTermInvestmentsPolicyPolicyTextBlock",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "stc_StatutoryAccountingPrinciplesPolicyPolicyTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Statutory Accounting Principles [Policy Text Block]",
                            "label":  "Statutory Accounting Principles Policy [Policy Text Block]",
                            "terseLabel":  "Statutory accounting"
                            }
                        }
                    },
                "localname":  "StatutoryAccountingPrinciplesPolicyPolicyTextBlock",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "stc_TimeBasedRestrictedStockMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Time-Based Restricted Stock [Member]",
                            "label":  "Time-Based Restricted Stock [Member]",
                            "terseLabel":  "Time-Based Shares"
                            }
                        }
                    },
                "localname":  "TimeBasedRestrictedStockMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_TitleAgencyOperationsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Title - Agency Operations [Member]",
                            "label":  "Title - Agency Operations [Member]",
                            "terseLabel":  "Title - Agency operations"
                            }
                        }
                    },
                "localname":  "TitleAgencyOperationsMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_TitleDirectOperationsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Title - Direct Operations [Member]",
                            "label":  "Title - Direct Operations [Member]",
                            "terseLabel":  "Title - Direct operations",
                            "verboseLabel":  "Direct Operations"
                            }
                        }
                    },
                "localname":  "TitleDirectOperationsMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/EquityInvesteesAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_TitleInsurancePremiumsAgencyMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Title Insurance Premiums, Agency [Member]",
                            "label":  "Title Insurance Premiums, Agency [Member]",
                            "verboseLabel":  "Title insurance premiums, Agency"
                            }
                        }
                    },
                "localname":  "TitleInsurancePremiumsAgencyMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/RevenuesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_TitleInsurancePremiumsDirectMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Title Insurance Premiums, Direct [Member]",
                            "label":  "Title Insurance Premiums, Direct [Member]",
                            "verboseLabel":  "Title insurance premiums, Direct"
                            }
                        }
                    },
                "localname":  "TitleInsurancePremiumsDirectMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/RevenuesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_TitleMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Title.",
                            "label":  "Title [Member]",
                            "terseLabel":  "Title segment",
                            "verboseLabel":  "Title"
                            }
                        }
                    },
                "localname":  "TitleMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails",
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesSummaryOfGoodwillDetails",
                    "http://www.stewart.com/role/SegmentInformationSelectedStatementOfOperationsAndIncomeLossInformationRelatedToSegmentsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "stc_TitlePlantsAtCost":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Title plants, at cost",
                            "label":  "Title Plants At Cost",
                            "verboseLabel":  "Title plants, at cost"
                            }
                        }
                    },
                "localname":  "TitlePlantsAtCost",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_TradeandOtherReceivables":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_PremiumsAndOtherReceivablesNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Trade and Other Receivables",
                            "label":  "Trade and Other Receivables",
                            "terseLabel":  "Trade and other"
                            }
                        }
                    },
                "localname":  "TradeandOtherReceivables",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "stc_UnderwriterMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Underwriter [Member]",
                            "label":  "Underwriter [Member]",
                            "terseLabel":  "Underwriter Entities"
                            }
                        }
                    },
                "localname":  "UnderwriterMember",
                "nsuri":  "http://www.stewart.com/20191231",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "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_AccountingStandardsUpdate201601Member":  {
                "auth_ref":  [
                    "r361"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accounting Standards Update 2016-01 Financial Instruments-Overall (Subtopic 825-10):  Recognition and Measurement of Financial Assets and Financial Liabilities.",
                            "label":  "Accounting Standards Update 2016-01 [Member]",
                            "terseLabel":  "ASU 2016-01"
                            }
                        }
                    },
                "localname":  "AccountingStandardsUpdate201601Member",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralInvestmentsInDebtAndEquitySecuritiesDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AccountingStandardsUpdate201602Member":  {
                "auth_ref":  [
                    "r376"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accounting Standards Update 2016-02 Leases (Topic 842).",
                            "label":  "Accounting Standards Update 2016-02 [Member]",
                            "terseLabel":  "ASU 2016-02"
                            }
                        }
                    },
                "localname":  "AccountingStandardsUpdate201602Member",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralRecentlyAdoptedAccountingPronouncementsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AccountingStandardsUpdate201802Member":  {
                "auth_ref":  [
                    "r61"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accounting Standards Update 2018-02 Income Statement-Reporting Comprehensive Income (Topic 220):  Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.",
                            "label":  "Accounting Standards Update 2018-02 [Member]",
                            "terseLabel":  "ASU 2018-02"
                            }
                        }
                    },
                "localname":  "AccountingStandardsUpdate201802Member",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent":  {
                "auth_ref":  [
                    "r417",
                    "r450"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "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, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.",
                            "label":  "Accounts Payable and Accrued Liabilities",
                            "negatedNetLabel":  "Deferred rent liabilities",
                            "terseLabel":  "Accounts payable and accrued liabilities",
                            "verboseLabel":  "Accounts payable and other liabilities"
                            }
                        }
                    },
                "localname":  "AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/GeneralRecentlyAdoptedAccountingPronouncementsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments":  {
                "auth_ref":  [
                    "r98"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  15.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings.  This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium.  As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.",
                            "label":  "Accretion (Amortization) of Discounts and Premiums, Investments",
                            "negatedTerseLabel":  "Amortization of net premium on debt securities investments"
                            }
                        }
                    },
                "localname":  "AccretionAmortizationOfDiscountsAndPremiumsInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment":  {
                "auth_ref":  [
                    "r28",
                    "r227"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "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":  "Accumulated depreciation"
                            }
                        }
                    },
                "localname":  "AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember":  {
                "auth_ref":  [
                    "r41",
                    "r42",
                    "r43",
                    "r49",
                    "r52"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), attributable to parent.",
                            "label":  "AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]",
                            "terseLabel":  "Net unrealized gains on investments"
                            }
                        }
                    },
                "localname":  "AccumulatedNetUnrealizedInvestmentGainLossMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax":  {
                "auth_ref":  [
                    "r48"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
                            "label":  "AOCI, Debt Securities, Available-for-sale, Adjustment, after Tax",
                            "terseLabel":  "Net unrealized gains (losses) on investments available-for-sale",
                            "verboseLabel":  "Net unrealized investment gains (losses)"
                            }
                        }
                    },
                "localname":  "AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax":  {
                "auth_ref":  [
                    "r39",
                    "r45",
                    "r48",
                    "r49",
                    "r357",
                    "r363",
                    "r365"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.",
                            "label":  "Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax",
                            "terseLabel":  "Foreign currency translation adjustments"
                            }
                        }
                    },
                "localname":  "AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems":  {
                "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":  "Accumulated Other Comprehensive Income (Loss) [Line Items]",
                            "terseLabel":  "Accumulated Other Comprehensive Income (Loss) [Line Items]"
                            }
                        }
                    },
                "localname":  "AccumulatedOtherComprehensiveIncomeLossLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]",
                            "terseLabel":  "Accumulated other comprehensive (loss) income:",
                            "verboseLabel":  "Accumulated other comprehensive (loss) income (AOCI):"
                            }
                        }
                    },
                "localname":  "AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AccumulatedOtherComprehensiveIncomeLossTable":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about components of accumulated other comprehensive income (loss).",
                            "label":  "Accumulated Other Comprehensive Income (Loss) [Table]",
                            "terseLabel":  "Accumulated Other Comprehensive Income (Loss) [Table]"
                            }
                        }
                    },
                "localname":  "AccumulatedOtherComprehensiveIncomeLossTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AccumulatedOtherComprehensiveIncomeMember":  {
                "auth_ref":  [
                    "r44",
                    "r49",
                    "r52",
                    "r342"
                    ],
                "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 income (loss)"
                            }
                        }
                    },
                "localname":  "AccumulatedOtherComprehensiveIncomeMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AccumulatedTranslationAdjustmentMember":  {
                "auth_ref":  [
                    "r40",
                    "r49",
                    "r52",
                    "r342"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Accumulated other comprehensive income (loss) resulting from 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, attributable to the parent.",
                            "label":  "Accumulated Foreign Currency Adjustment Attributable to Parent [Member]",
                            "terseLabel":  "Foreign currency translation adjustments"
                            }
                        }
                    },
                "localname":  "AccumulatedTranslationAdjustmentMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AcquiredFiniteLivedIntangibleAssetsLineItems":  {
                "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":  "Acquired Finite-Lived Intangible Assets [Line Items]",
                            "terseLabel":  "Acquired Finite-Lived Intangible Assets [Line Items]"
                            }
                        }
                    },
                "localname":  "AcquiredFiniteLivedIntangibleAssetsLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife":  {
                "auth_ref":  [
                    "r213"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.",
                            "label":  "Acquired Finite-lived Intangible Assets, Weighted Average Useful Life",
                            "terseLabel":  "Amortization period"
                            }
                        }
                    },
                "localname":  "AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_AdditionalPaidInCapitalCommonStock":  {
                "auth_ref":  [
                    "r18"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_StockholdersEquity",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions.  Includes only common stock transactions (excludes preferred stock transactions).  May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.",
                            "label":  "Additional Paid in Capital, Common Stock",
                            "terseLabel":  "Additional paid-in capital"
                            }
                        }
                    },
                "localname":  "AdditionalPaidInCapitalCommonStock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "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.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AdjustmentsForNewAccountingPronouncementsAxis":  {
                "auth_ref":  [
                    "r124"
                    ],
                "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.stewart.com/role/GeneralRecentlyAdoptedAccountingPronouncementsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue":  {
                "auth_ref":  [
                    "r269",
                    "r271",
                    "r286",
                    "r287"
                    ],
                "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",
                            "verboseLabel":  "Stock compensation"
                            }
                        }
                    },
                "localname":  "AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "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":  "Add (deduct):"
                            }
                        }
                    },
                "localname":  "AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AllocatedShareBasedCompensationExpense":  {
                "auth_ref":  [
                    "r271",
                    "r282",
                    "r285"
                    ],
                "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 costs"
                            }
                        }
                    },
                "localname":  "AllocatedShareBasedCompensationExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AllowanceForCreditLossMember":  {
                "auth_ref":  [
                    "r122"
                    ],
                "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":  "Allowance for uncollectible amounts"
                            }
                        }
                    },
                "localname":  "AllowanceForCreditLossMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIiValuationAndQualifyingAccountsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables":  {
                "auth_ref":  [
                    "r158"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_PremiumsAndOtherReceivablesNet",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet.",
                            "label":  "Allowance for Doubtful Accounts, Premiums and Other Receivables",
                            "negatedLabel":  "Allowance for uncollectible amounts"
                            }
                        }
                    },
                "localname":  "AllowanceForDoubtfulAccountsPremiumsAndOtherReceivables",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AmortizationOfIntangibleAssets":  {
                "auth_ref":  [
                    "r97",
                    "r211",
                    "r218"
                    ],
                "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 of other intangibles"
                            }
                        }
                    },
                "localname":  "AmortizationOfIntangibleAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AssetImpairmentCharges":  {
                "auth_ref":  [
                    "r97",
                    "r224"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of write-down of assets recognized in the income statement.  Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.",
                            "label":  "Asset Impairment Charges",
                            "terseLabel":  "Impairment expenses"
                            }
                        }
                    },
                "localname":  "AssetImpairmentCharges",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_Assets":  {
                "auth_ref":  [
                    "r147",
                    "r406",
                    "r439"
                    ],
                "calculation":  {
                    "http://www.stewart.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.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AssetsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Assets [Abstract]",
                            "terseLabel":  "Assets",
                            "verboseLabel":  "Assets:"
                            }
                        }
                    },
                "localname":  "AssetsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax":  {
                "auth_ref":  [
                    "r164"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
                            "label":  "Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax",
                            "terseLabel":  "Gains"
                            }
                        }
                    },
                "localname":  "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedGainsAndLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax":  {
                "auth_ref":  [
                    "r165"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
                            "label":  "Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax",
                            "terseLabel":  "Losses"
                            }
                        }
                    },
                "localname":  "AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedGainsAndLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis":  {
                "auth_ref":  [
                    "r162",
                    "r195"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
                            "label":  "Debt Securities, Available-for-sale, Amortized Cost",
                            "terseLabel":  "Amortized costs",
                            "totalLabel":  "Amortized costs"
                            }
                        }
                    },
                "localname":  "AvailableForSaleDebtSecuritiesAmortizedCostBasis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAmortizedCostsAndFairValuesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Debt Securities, Available-for-sale [Abstract]",
                            "terseLabel":  "Investments in debt and equity securities, at fair value:",
                            "verboseLabel":  "Fair values"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract]",
                            "terseLabel":  "Losses"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionQualitativeDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]",
                            "terseLabel":  "Fair values"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesContinuousUnrealizedLossPositionQualitativeDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost":  {
                "auth_ref":  [
                    "r169"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year.  Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
                            "label":  "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost",
                            "terseLabel":  "After five years through ten years"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue":  {
                "auth_ref":  [
                    "r166",
                    "r169",
                    "r426"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following latest fiscal year.  Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
                            "label":  "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value",
                            "terseLabel":  "After five years through ten years"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost":  {
                "auth_ref":  [
                    "r168"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year.  Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
                            "label":  "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost",
                            "terseLabel":  "After one year through five years"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue":  {
                "auth_ref":  [
                    "r166",
                    "r168",
                    "r425"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year.  Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
                            "label":  "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value",
                            "terseLabel":  "After one year through five years"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost":  {
                "auth_ref":  [
                    "r170"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following latest fiscal year.  Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
                            "label":  "Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost",
                            "terseLabel":  "After ten years"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue":  {
                "auth_ref":  [
                    "r166",
                    "r170",
                    "r427"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fair value of investment in debt security, measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following latest fiscal year.  Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
                            "label":  "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value",
                            "terseLabel":  "After ten years"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]",
                            "terseLabel":  "Amortized costs"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasisAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost":  {
                "auth_ref":  [
                    "r167"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amortized cost of investment in debt security measured at fair value with change recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next fiscal year following latest fiscal year.  Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
                            "label":  "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost",
                            "terseLabel":  "In one year or less"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue":  {
                "auth_ref":  [
                    "r166",
                    "r167",
                    "r424"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_AvailableForSaleSecuritiesDebtSecurities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), maturing in next fiscal year following latest fiscal year.  Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.",
                            "label":  "Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value",
                            "terseLabel":  "In one year or less"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AvailableForSaleSecuritiesDebtSecurities":  {
                "auth_ref":  [
                    "r160",
                    "r163",
                    "r195"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesInvestmentsInDebtAndEquitySecuritiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "stc_InvestmentsInDebtAndEquitySecurities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
                            "label":  "Debt Securities, Available-for-sale",
                            "netLabel":  "Debt securities",
                            "terseLabel":  "Fair values",
                            "totalLabel":  "Fair values",
                            "verboseLabel":  "Foreign debt securities"
                            }
                        }
                    },
                "localname":  "AvailableForSaleSecuritiesDebtSecurities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAmortizedCostsAndFairValuesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesDebtSecuritiesAccordingContractualTermsDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesInvestmentsInDebtAndEquitySecuritiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_AwardTypeAxis":  {
                "auth_ref":  [
                    "r272",
                    "r284"
                    ],
                "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.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "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.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "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":  "Management's responsibility"
                            }
                        }
                    },
                "localname":  "BasisOfAccountingPolicyPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_BenefitsLossesAndExpenses":  {
                "auth_ref":  [
                    "r460"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The total amount of expense recognized during the period for future policy benefits, claims and claims adjustment costs, and for selling, general and administrative costs.",
                            "label":  "Benefits, Losses and Expenses",
                            "totalLabel":  "Total expenses"
                            }
                        }
                    },
                "localname":  "BenefitsLossesAndExpenses",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BenefitsLossesAndExpensesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Benefits, Losses and Expenses [Abstract]",
                            "terseLabel":  "Expenses"
                            }
                        }
                    },
                "localname":  "BenefitsLossesAndExpensesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_BuildingMember":  {
                "auth_ref":  [
                    "r226"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Facility held for productive use including, but not limited to, office, production, storage and distribution facilities.",
                            "label":  "Building [Member]",
                            "terseLabel":  "Buildings"
                            }
                        }
                    },
                "localname":  "BuildingMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_BuildingsAndImprovementsGross":  {
                "auth_ref":  [
                    "r5",
                    "r226"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_PropertyPlantAndEquipmentNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.",
                            "label":  "Buildings and Improvements, Gross",
                            "terseLabel":  "Buildings"
                            }
                        }
                    },
                "localname":  "BuildingsAndImprovementsGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1":  {
                "auth_ref":  [
                    "r96",
                    "r328"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.",
                            "label":  "Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability",
                            "terseLabel":  "Net realized losses from change in fair value of contingent consideration liabilities"
                            }
                        }
                    },
                "localname":  "BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationIntegrationRelatedCosts":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Costs incurred to effect a business combination which have been expensed during the period.  Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.",
                            "label":  "Business Combination, Integration Related Costs",
                            "terseLabel":  "Expenses related to Mergers and strategic alternatives review"
                            }
                        }
                    },
                "localname":  "BusinessCombinationIntegrationRelatedCosts",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles":  {
                "auth_ref":  [
                    "r325",
                    "r326"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of identifiable intangible assets recognized as of the acquisition date.",
                            "label":  "Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles",
                            "terseLabel":  "Other intangibles acquired"
                            }
                        }
                    },
                "localname":  "BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CapitalLeaseObligations":  {
                "auth_ref":  [
                    "r13",
                    "r375",
                    "r441"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.",
                            "label":  "Capital Lease Obligations",
                            "verboseLabel":  "Capital lease obligations"
                            }
                        }
                    },
                "localname":  "CapitalLeaseObligations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CapitalLeaseObligationsIncurred":  {
                "auth_ref":  [
                    "r103",
                    "r104"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase in lease obligation from new lease.",
                            "label":  "Lease Obligation Incurred",
                            "terseLabel":  "Assets purchased through capital lease obligations"
                            }
                        }
                    },
                "localname":  "CapitalLeaseObligationsIncurred",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CashAndCashEquivalentsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Cash and Cash Equivalents [Abstract]"
                            }
                        }
                    },
                "localname":  "CashAndCashEquivalentsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_CashAndCashEquivalentsAtCarryingValue":  {
                "auth_ref":  [
                    "r3",
                    "r24",
                    "r99"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  11.0,
                        "parentTag":  "us-gaap_Assets",
                        "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.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CashAndCashEquivalentsPolicyTextBlock":  {
                "auth_ref":  [
                    "r6",
                    "r101",
                    "r107"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents.  Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.",
                            "label":  "Cash and Cash Equivalents, Policy [Policy Text Block]",
                            "terseLabel":  "Cash equivalents"
                            }
                        }
                    },
                "localname":  "CashAndCashEquivalentsPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents":  {
                "auth_ref":  [
                    "r92",
                    "r99",
                    "r106"
                    ],
                "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",
                            "periodEndLabel":  "Cash and cash equivalents at end of year",
                            "periodStartLabel":  "Cash and cash equivalents at beginning of year"
                            }
                        }
                    },
                "localname":  "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect":  {
                "auth_ref":  [
                    "r92",
                    "r362"
                    ],
                "calculation":  {
                    "http://www.stewart.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":  "Increase (decrease) in cash and cash equivalents"
                            }
                        }
                    },
                "localname":  "CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CashDividendsPaidToParentCompany":  {
                "auth_ref":  [
                    "r119"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method.",
                            "label":  "SEC Schedule, 12-04, Cash Dividends Paid to Registrant, Subsidiaries and Equity Method Investees",
                            "terseLabel":  "Dividends paid by guaranty"
                            }
                        }
                    },
                "localname":  "CashDividendsPaidToParentCompany",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails",
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CommitmentsAndContingencies":  {
                "auth_ref":  [
                    "r34",
                    "r236",
                    "r418",
                    "r448"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "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":  "Contingent liabilities and commitments"
                            }
                        }
                    },
                "localname":  "CommitmentsAndContingencies",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "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":  [
                    "r235",
                    "r243"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for commitments and contingencies.",
                            "label":  "Commitments and Contingencies Disclosure [Text Block]",
                            "terseLabel":  "Contingent liabilities and commitments"
                            }
                        }
                    },
                "localname":  "CommitmentsAndContingenciesDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ContingentLiabilitiesAndCommitments"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_CommitmentsAndContingenciesPolicyTextBlock":  {
                "auth_ref":  [
                    "r107",
                    "r246",
                    "r483",
                    "r484"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for commitments and contingencies, which may include policies for recognizing and measuring loss and gain contingencies.",
                            "label":  "Commitments and Contingencies, Policy [Policy Text Block]",
                            "terseLabel":  "Title losses and related claims"
                            }
                        }
                    },
                "localname":  "CommitmentsAndContingenciesPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_CommonStockDividendsPerShareCashPaid":  {
                "auth_ref":  [
                    "r256"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Aggregate dividends paid during the period for each share of common stock outstanding.",
                            "label":  "Common Stock, Dividends, Per Share, Cash Paid",
                            "terseLabel":  "Dividends on common stock per share (in usd per share)"
                            }
                        }
                    },
                "localname":  "CommonStockDividendsPerShareCashPaid",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquityParenthetical"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "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]",
                            "verboseLabel":  "Common Stock"
                            }
                        }
                    },
                "localname":  "CommonStockMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_CommonStockParOrStatedValuePerShare":  {
                "auth_ref":  [
                    "r17"
                    ],
                "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 usd per share)"
                            }
                        }
                    },
                "localname":  "CommonStockParOrStatedValuePerShare",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheetsParenthetical",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsAdditionalInformationDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_CommonStockSharesAuthorized":  {
                "auth_ref":  [
                    "r17"
                    ],
                "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, shares authorized (in shares)"
                            }
                        }
                    },
                "localname":  "CommonStockSharesAuthorized",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheetsParenthetical",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsAdditionalInformationDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_CommonStockSharesIssued":  {
                "auth_ref":  [
                    "r17"
                    ],
                "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",
                            "terseLabel":  "Common stock, shares issued (in shares)"
                            }
                        }
                    },
                "localname":  "CommonStockSharesIssued",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheetsParenthetical",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsAdditionalInformationDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_CommonStockSharesOutstanding":  {
                "auth_ref":  [
                    "r17",
                    "r251"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of shares of common stock outstanding.  Common stock represent the ownership interest in a corporation.",
                            "label":  "Common Stock, Shares, Outstanding",
                            "terseLabel":  "Common stock, shares outstanding (in shares)"
                            }
                        }
                    },
                "localname":  "CommonStockSharesOutstanding",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheetsParenthetical",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsAdditionalInformationDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_CommonStockValue":  {
                "auth_ref":  [
                    "r17"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails":  {
                        "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 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",
                            "terseLabel":  "Common Stock \u2013 $1 par, authorized 51,500,000; issued 24,061,568 and 24,071,508; outstanding 23,709,407 and 23,719,347, respectively",
                            "verboseLabel":  "Common Stock \u2013 $1 par, authorized 51,500,000; issued 24,061,568 and 24,071,508; outstanding 23,709,407 and 23,719,347, respectively"
                            }
                        }
                    },
                "localname":  "CommonStockValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ComprehensiveIncomeNetOfTax":  {
                "auth_ref":  [
                    "r55",
                    "r57",
                    "r58"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "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 attributable to Stewart"
                            }
                        }
                    },
                "localname":  "ComprehensiveIncomeNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ComprehensiveIncomeNetOfTaxAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]",
                            "terseLabel":  "Other comprehensive income (loss), net of taxes:"
                            }
                        }
                    },
                "localname":  "ComprehensiveIncomeNetOfTaxAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest":  {
                "auth_ref":  [
                    "r55",
                    "r57",
                    "r333",
                    "r334",
                    "r345"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  1.0,
                        "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 attributable to noncontrolling interests"
                            }
                        }
                    },
                "localname":  "ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest":  {
                "auth_ref":  [
                    "r55",
                    "r57",
                    "r332",
                    "r345"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  2.0,
                        "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"
                            }
                        }
                    },
                "localname":  "ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]",
                            "terseLabel":  "Net income attributable to Stewart"
                            }
                        }
                    },
                "localname":  "ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ComprehensiveIncomeNoteTextBlock":  {
                "auth_ref":  [
                    "r74"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.",
                            "label":  "Comprehensive Income (Loss) Note [Text Block]",
                            "terseLabel":  "Other comprehensive income (loss)"
                            }
                        }
                    },
                "localname":  "ComprehensiveIncomeNoteTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLoss"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock":  {
                "auth_ref":  [
                    "r120",
                    "r329"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented.  Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document.",
                            "label":  "Condensed Financial Information of Parent Company Only Disclosure [Text Block]",
                            "terseLabel":  "Schedule I - Financial Information of the Registrant (Parent Company)"
                            }
                        }
                    },
                "localname":  "CondensedFinancialInformationOfParentCompanyOnlyDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompany"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ConsolidationPolicyTextBlock":  {
                "auth_ref":  [
                    "r107",
                    "r337",
                    "r346",
                    "r347"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting.  The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.",
                            "label":  "Consolidation, Policy [Policy Text Block]",
                            "terseLabel":  "Consolidation"
                            }
                        }
                    },
                "localname":  "ConsolidationPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_CorporateDebtSecuritiesMember":  {
                "auth_ref":  [
                    "r264",
                    "r268",
                    "r474"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt securities issued by domestic or foreign corporate business, banks and other entities with a promise of repayment.",
                            "label":  "Corporate Debt Securities [Member]",
                            "terseLabel":  "Corporate"
                            }
                        }
                    },
                "localname":  "CorporateDebtSecuritiesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAmortizedCostsAndFairValuesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedGainsAndLossesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "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.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "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.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption":  {
                "auth_ref":  [
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.",
                            "label":  "Cumulative Effect of New Accounting Principle in Period of Adoption",
                            "terseLabel":  "Cumulative effect adjustments on adoption of new accounting pronouncements",
                            "verboseLabel":  "Cumulative effect adjustments on adoption of new accounting standards (Notes 1-H and 7)"
                            }
                        }
                    },
                "localname":  "CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CumulativeEffectOnRetainedEarningsNetOfTax1":  {
                "auth_ref":  [
                    "r127"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of the cumulative effect on retained earnings net of related income tax effect.",
                            "label":  "Cumulative Effect on Retained Earnings, Net of Tax",
                            "verboseLabel":  "Net unrealized investment gains"
                            }
                        }
                    },
                "localname":  "CumulativeEffectOnRetainedEarningsNetOfTax1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralInvestmentsInDebtAndEquitySecuritiesDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CurrentFederalTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r112",
                    "r314",
                    "r318"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_CurrentIncomeTaxExpenseBenefit",
                        "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":  "Federal"
                            }
                        }
                    },
                "localname":  "CurrentFederalTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CurrentForeignTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r116",
                    "r316"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails":  {
                        "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":  "Foreign"
                            }
                        }
                    },
                "localname":  "CurrentForeignTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CurrentIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r112",
                    "r314",
                    "r318"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "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 income tax expense:"
                            }
                        }
                    },
                "localname":  "CurrentIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Current Income Tax Expense (Benefit), Continuing Operations [Abstract]",
                            "terseLabel":  "Current income tax expense:"
                            }
                        }
                    },
                "localname":  "CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_CurrentStateAndLocalTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r112",
                    "r314",
                    "r318"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails":  {
                        "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":  "State"
                            }
                        }
                    },
                "localname":  "CurrentStateAndLocalTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "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":  [
                    "r250"
                    ],
                "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"
                            }
                        }
                    },
                "localname":  "DebtDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayable"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "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 spread on variable rate, line of credit (percent)"
                            }
                        }
                    },
                "localname":  "DebtInstrumentBasisSpreadOnVariableRate1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "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.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DebtInstrumentTable":  {
                "auth_ref":  [
                    "r33",
                    "r114",
                    "r252",
                    "r253",
                    "r254",
                    "r255",
                    "r367",
                    "r368",
                    "r370",
                    "r431"
                    ],
                "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.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger":  {
                "auth_ref":  [
                    "r175",
                    "r200",
                    "r203"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss.  Includes beneficial interest in securitized financial asset.",
                            "label":  "Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer",
                            "terseLabel":  "More than 12 months"
                            }
                        }
                    },
                "localname":  "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss":  {
                "auth_ref":  [
                    "r175",
                    "r200"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss.  Includes beneficial interest in securitized financial asset.",
                            "label":  "Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss",
                            "terseLabel":  "More than 12 months"
                            }
                        }
                    },
                "localname":  "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions":  {
                "auth_ref":  [
                    "r198"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss.  Includes beneficial interest in securitized financial asset.",
                            "label":  "Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Number of Positions",
                            "terseLabel":  "Number of investments in an unrealized loss positions for more than 12 months"
                            }
                        }
                    },
                "localname":  "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months":  {
                "auth_ref":  [
                    "r175",
                    "r200",
                    "r203"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss.  Includes beneficial interest in securitized financial asset.",
                            "label":  "Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months",
                            "terseLabel":  "Less than 12 months"
                            }
                        }
                    },
                "localname":  "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss":  {
                "auth_ref":  [
                    "r175",
                    "r200"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss.  Includes beneficial interest in securitized financial asset.",
                            "label":  "Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss",
                            "terseLabel":  "Less than 12 months"
                            }
                        }
                    },
                "localname":  "DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DebtSecuritiesAvailableForSaleRealizedGain":  {
                "auth_ref":  [
                    "r176"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
                            "label":  "Debt Securities, Available-for-sale, Realized Gain",
                            "terseLabel":  "Net realized gains from sale of securities investments"
                            }
                        }
                    },
                "localname":  "DebtSecuritiesAvailableForSaleRealizedGain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DebtSecuritiesAvailableForSaleTable":  {
                "auth_ref":  [
                    "r178"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
                            "label":  "Debt Securities, Available-for-sale [Table]",
                            "terseLabel":  "Debt Securities, Available-for-sale [Table]"
                            }
                        }
                    },
                "localname":  "DebtSecuritiesAvailableForSaleTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralInvestmentsInDebtAndEquitySecuritiesDetails",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsProceedsFromSaleOfInvestmentDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAmortizedCostsAndFairValuesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedGainsAndLossesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock":  {
                "auth_ref":  [
                    "r178"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
                            "label":  "Debt Securities, Available-for-sale [Table Text Block]",
                            "terseLabel":  "Amortized costs and fair values",
                            "verboseLabel":  "Proceeds from sale of investments available-for-sale"
                            }
                        }
                    },
                "localname":  "DebtSecuritiesAvailableForSaleTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsTables",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition":  {
                "auth_ref":  [
                    "r171",
                    "r196",
                    "r203"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss.",
                            "label":  "Debt Securities, Available-for-sale, Unrealized Loss Position",
                            "totalLabel":  "Total"
                            }
                        }
                    },
                "localname":  "DebtSecuritiesAvailableForSaleUnrealizedLossPosition",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss":  {
                "auth_ref":  [
                    "r172",
                    "r197"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss.  Includes beneficial interest in securitized financial asset.",
                            "label":  "Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss",
                            "totalLabel":  "Total"
                            }
                        }
                    },
                "localname":  "DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions":  {
                "auth_ref":  [
                    "r173",
                    "r198"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss.  Includes beneficial interest in securitized financial asset.",
                            "label":  "Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions",
                            "terseLabel":  "Number of investments in an unrealized loss position"
                            }
                        }
                    },
                "localname":  "DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "us-gaap_DebtSecuritiesMember":  {
                "auth_ref":  [
                    "r178"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt instrument issued by corporations, governments and governmental agencies, municipalities, and other institutions.",
                            "label":  "Debt Securities [Member]",
                            "terseLabel":  "Debt securities"
                            }
                        }
                    },
                "localname":  "DebtSecuritiesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsProceedsFromSaleOfInvestmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_DebtWeightedAverageInterestRate":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average interest rate of debt outstanding.",
                            "label":  "Debt, Weighted Average Interest Rate",
                            "terseLabel":  "Average interest rate"
                            }
                        }
                    },
                "localname":  "DebtWeightedAverageInterestRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableSummaryOfNotesPayableDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_DeferredFederalIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r112",
                    "r315",
                    "r318"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_DeferredIncomeTaxExpenseBenefit",
                        "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":  "Federal"
                            }
                        }
                    },
                "localname":  "DeferredFederalIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredForeignIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r112",
                    "r315",
                    "r318"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails":  {
                        "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":  "Foreign"
                            }
                        }
                    },
                "localname":  "DeferredForeignIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredIncomeTaxAssetsNet":  {
                "auth_ref":  [
                    "r308"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_Assets",
                        "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 tax assets, net"
                            }
                        }
                    },
                "localname":  "DeferredIncomeTaxAssetsNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r97",
                    "r112",
                    "r315",
                    "r318"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  1.0
                        }
                    },
                "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 income tax expense (benefit):"
                            }
                        }
                    },
                "localname":  "DeferredIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract]",
                            "terseLabel":  "Deferred income tax expense (benefit):"
                            }
                        }
                    },
                "localname":  "DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DeferredIncomeTaxLiabilities":  {
                "auth_ref":  [
                    "r14",
                    "r15",
                    "r304",
                    "r408",
                    "r434"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_DeferredTaxLiabilities",
                        "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":  "Deferred tax liabilities \u2013 gross"
                            }
                        }
                    },
                "localname":  "DeferredIncomeTaxLiabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredIncomeTaxLiabilitiesNet":  {
                "auth_ref":  [
                    "r296",
                    "r308"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "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",
                            "terseLabel":  "Deferred tax liabilities, net"
                            }
                        }
                    },
                "localname":  "DeferredIncomeTaxLiabilitiesNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r112",
                    "r315",
                    "r318"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails":  {
                        "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":  "State"
                            }
                        }
                    },
                "localname":  "DeferredStateAndLocalIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsGross":  {
                "auth_ref":  [
                    "r305"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "order":  2.0,
                        "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":  "Deferred tax assets \u2013 gross"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsInvestments":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "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 investments (excludes investments in subsidiaries and equity method investments).",
                            "label":  "Deferred Tax Assets, Investments",
                            "terseLabel":  "Investments"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsNet":  {
                "auth_ref":  [
                    "r306"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_DeferredTaxLiabilities",
                        "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":  "Deferred tax assets \u2013 net"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "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.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DeferredTaxAssetsOperatingLossCarryforwards":  {
                "auth_ref":  [
                    "r289",
                    "r312",
                    "r313"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "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 operating loss carryforwards.",
                            "label":  "Deferred Tax Assets, Operating Loss Carryforwards",
                            "terseLabel":  "Net operating loss (NOL) carryforwards",
                            "verboseLabel":  "Deferred tax assets relating to NOL carryforwards"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsOperatingLossCarryforwards",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails",
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsOther":  {
                "auth_ref":  [
                    "r291",
                    "r312",
                    "r313"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "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 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.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "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 property, plant, and equipment.",
                            "label":  "Deferred Tax Assets, Property, Plant and Equipment",
                            "terseLabel":  "Capitalized expenses"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsPropertyPlantAndEquipment",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsTaxCreditCarryforwards":  {
                "auth_ref":  [
                    "r310",
                    "r312",
                    "r313"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_DeferredTaxAssetsGross",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.",
                            "label":  "Deferred Tax Assets, Tax Credit Carryforwards",
                            "terseLabel":  "Tax credit carryforwards"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsTaxCreditCarryforwards",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities":  {
                "auth_ref":  [
                    "r289",
                    "r312",
                    "r313"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "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 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.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts":  {
                "auth_ref":  [
                    "r289",
                    "r312",
                    "r313"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "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 the allowance for doubtful accounts.",
                            "label":  "Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts",
                            "terseLabel":  "Allowance for uncollectible amounts"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsUnrealizedCurrencyLosses":  {
                "auth_ref":  [
                    "r290",
                    "r312",
                    "r313"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "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",
                            "terseLabel":  "Foreign currency translation adjustments"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsUnrealizedCurrencyLosses",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross":  {
                "auth_ref":  [
                    "r291",
                    "r312"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "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 unrealized losses on available-for-sale securities.",
                            "label":  "Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross",
                            "terseLabel":  "Net unrealized losses on investments in securities"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxAssetsValuationAllowance":  {
                "auth_ref":  [
                    "r307"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "order":  1.0,
                        "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 allowance"
                            }
                        }
                    },
                "localname":  "DeferredTaxAssetsValuationAllowance",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxLiabilities":  {
                "auth_ref":  [
                    "r296",
                    "r308"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting.",
                            "label":  "Deferred Tax Liabilities, Net",
                            "negatedTotalLabel":  "Net deferred income tax liability",
                            "terseLabel":  "Net deferred tax liabilities"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails",
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "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 reserves and accruals.",
                            "label":  "Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals",
                            "negatedLabel":  "Title loss provisions"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilitiesDeferredExpenseReservesAndAccruals",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets":  {
                "auth_ref":  [
                    "r291",
                    "r312",
                    "r313"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "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":  "Amortization \u2013 goodwill and other intangibles"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilitiesGoodwillAndIntangibleAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxLiabilitiesInvestments":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "order":  5.0,
                        "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 investments (excludes investments in subsidiaries and equity method investments).",
                            "label":  "Deferred Tax Liabilities, Investments",
                            "negatedLabel":  "Net unrealized gains on investments in securities"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilitiesInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "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.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DeferredTaxLiabilitiesOther":  {
                "auth_ref":  [
                    "r291",
                    "r312",
                    "r313"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_DeferredIncomeTaxLiabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of deferred tax liability attributable to taxable temporary differences classified as other.",
                            "label":  "Deferred Tax Liabilities, Other",
                            "negatedLabel":  "Other"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilitiesOther",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment":  {
                "auth_ref":  [
                    "r291",
                    "r312",
                    "r313"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails":  {
                        "order":  4.0,
                        "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",
                            "negatedTerseLabel":  "Fixed assets"
                            }
                        }
                    },
                "localname":  "DeferredTaxLiabilitiesPropertyPlantAndEquipment",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesDeferredTaxAssetsAndLiabilitiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DepreciationAndAmortization":  {
                "auth_ref":  [
                    "r97",
                    "r225"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_BenefitsLossesAndExpenses",
                        "weight":  1.0
                        }
                    },
                "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":  "Depreciation and amortization",
                            "verboseLabel":  "Depreciation"
                            }
                        }
                    },
                "localname":  "DepreciationAndAmortization",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails",
                    "http://www.stewart.com/role/SegmentInformationSelectedStatementOfOperationsAndIncomeLossInformationRelatedToSegmentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "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.stewart.com/role/RevenuesDetails"
                    ],
                "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.stewart.com/role/RevenuesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DisaggregationOfRevenueTableTextBlock":  {
                "auth_ref":  [
                    "r260"
                    ],
                "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":  "Summary of operating revenues"
                            }
                        }
                    },
                "localname":  "DisaggregationOfRevenueTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/RevenuesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock":  {
                "auth_ref":  [
                    "r288"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for share-based payment arrangement.",
                            "label":  "Share-based Payment Arrangement [Text Block]",
                            "terseLabel":  "Share-based payments"
                            }
                        }
                    },
                "localname":  "DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPayments"
                    ],
                "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_DividendsCommonStock":  {
                "auth_ref":  [
                    "r256",
                    "r430"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).",
                            "label":  "Dividends, Common Stock",
                            "negatedLabel":  "Dividends on Common Stock ($1.20 per share)"
                            }
                        }
                    },
                "localname":  "DividendsCommonStock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DividendsCommonStockCash":  {
                "auth_ref":  [
                    "r256"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.",
                            "label":  "Dividends, Common Stock, Cash",
                            "negatedTerseLabel":  "Cash dividends on Common Stock"
                            }
                        }
                    },
                "localname":  "DividendsCommonStockCash",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_DividendsPayableLineItems":  {
                "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":  "Dividends Payable [Line Items]",
                            "terseLabel":  "Dividends Payable [Line Items]"
                            }
                        }
                    },
                "localname":  "DividendsPayableLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_DividendsPayableTable":  {
                "auth_ref":  [
                    "r103"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A table that contains information regarding dividends that have been declared but not paid as of the financial reporting date.  This information may contain the amount, amount per share, declared date, and date to be paid.",
                            "label":  "Dividends Payable [Table]",
                            "terseLabel":  "Dividends Payable [Table]"
                            }
                        }
                    },
                "localname":  "DividendsPayableTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "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":  "U.S.  Federal"
                            }
                        }
                    },
                "localname":  "DomesticCountryMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_EarningsPerShareAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Earnings Per Share [Abstract]"
                            }
                        }
                    },
                "localname":  "EarningsPerShareAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_EarningsPerShareBasic":  {
                "auth_ref":  [
                    "r68",
                    "r125",
                    "r130",
                    "r132",
                    "r133",
                    "r134",
                    "r137",
                    "r422",
                    "r455"
                    ],
                "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",
                            "terseLabel":  "Basic earnings per share attributable to Stewart (in usd per share)"
                            }
                        }
                    },
                "localname":  "EarningsPerShareBasic",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/EarningsPerShareDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_EarningsPerShareDiluted":  {
                "auth_ref":  [
                    "r68",
                    "r125",
                    "r130",
                    "r132",
                    "r133",
                    "r134",
                    "r137",
                    "r422",
                    "r455"
                    ],
                "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",
                            "terseLabel":  "Diluted earnings per share attributable to Stewart (in usd per share)",
                            "verboseLabel":  "Diluted (loss) earnings per share attributable to Stewart (in usd per share)"
                            }
                        }
                    },
                "localname":  "EarningsPerShareDiluted",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/EarningsPerShareDetails",
                    "http://www.stewart.com/role/QuarterlyFinancialInformationUnauditedDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_EarningsPerShareTextBlock":  {
                "auth_ref":  [
                    "r138"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for earnings per share.",
                            "label":  "Earnings Per Share [Text Block]",
                            "terseLabel":  "Earnings per share"
                            }
                        }
                    },
                "localname":  "EarningsPerShareTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EarningsPerShare"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents":  {
                "auth_ref":  [
                    "r362"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "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":  "Effects of changes in foreign currency exchange rates"
                            }
                        }
                    },
                "localname":  "EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EffectiveIncomeTaxRateContinuingOperations":  {
                "auth_ref":  [
                    "r115",
                    "r297",
                    "r298"
                    ],
                "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":  "Effective income tax rate"
                            }
                        }
                    },
                "localname":  "EffectiveIncomeTaxRateContinuingOperations",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017TransitionTaxOnAccumulatedForeignEarningsAmount":  {
                "auth_ref":  [
                    "r297"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails":  {
                        "order":  6.0,
                        "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 operations, attributable to increase (decrease) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.",
                            "label":  "Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax on Accumulated Foreign Earnings, Amount",
                            "terseLabel":  "2017 Act impact from deemed repatriation of deferred foreign income",
                            "verboseLabel":  "Transition tax expense (benefit) on deemed repatriation of deferred foreign income"
                            }
                        }
                    },
                "localname":  "EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017TransitionTaxOnAccumulatedForeignEarningsAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails",
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1":  {
                "auth_ref":  [
                    "r283"
                    ],
                "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":  "Compensation costs not yet recognized, period for recognition"
                            }
                        }
                    },
                "localname":  "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions":  {
                "auth_ref":  [
                    "r283"
                    ],
                "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":  "Compensation costs not yet recognized"
                            }
                        }
                    },
                "localname":  "EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense":  {
                "auth_ref":  [
                    "r282"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of tax benefit for recognition of expense of award under share-based payment arrangement.",
                            "label":  "Share-based Payment Arrangement, Expense, Tax Benefit",
                            "terseLabel":  "Tax benefits related to vesting of awards"
                            }
                        }
                    },
                "localname":  "EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EmploymentContractsMember":  {
                "auth_ref":  [
                    "r327"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Contracts securing the services of employees, which may define the period of employment and the nature of the business relationship, and which may include nondisclosure and noncompete restrictions.",
                            "label":  "Employment Contracts [Member]",
                            "terseLabel":  "Employment and Non-compete Agreements"
                            }
                        }
                    },
                "localname":  "EmploymentContractsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_EquityAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Equity [Abstract]"
                            }
                        }
                    },
                "localname":  "EquityAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_EquityComponentDomain":  {
                "auth_ref":  [
                    "r251"
                    ],
                "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.stewart.com/role/ConsolidatedStatementsOfEquity",
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails",
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_EquityMethodInvestmentDividendsOrDistributions":  {
                "auth_ref":  [
                    "r66",
                    "r91",
                    "r97",
                    "r453"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  12.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of distribution received from equity method investee for return on investment, classified as operating activities.  Excludes distribution for return of investment, classified as investing activities.",
                            "label":  "Proceeds from Equity Method Investment, Distribution",
                            "terseLabel":  "Dividends received from equity investees"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestmentDividendsOrDistributions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment":  {
                "auth_ref":  [
                    "r181"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting.  The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings.  The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method.  Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.",
                            "label":  "Equity Method Investment, Other than Temporary Impairment",
                            "verboseLabel":  "Impairment on disposal of equity investment"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestmentOtherThanTemporaryImpairment",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EquityInvesteesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets":  {
                "auth_ref":  [
                    "r1",
                    "r109",
                    "r184",
                    "r185",
                    "r359"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of assets reported by an equity method investment of the entity.",
                            "label":  "Equity Method Investment, Summarized Financial Information, Assets",
                            "terseLabel":  "Total assets"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestmentSummarizedFinancialInformationAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EquityInvesteesSummarizedAggregateFinancialInformationForEquityInvesteesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity":  {
                "auth_ref":  [
                    "r1",
                    "r117",
                    "r185",
                    "r359",
                    "r360"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of equity, including noncontrolling interest, reported by an equity method investment of the entity.",
                            "label":  "Equity Method Investment Summarized Financial Information, Equity",
                            "terseLabel":  "Stockholders\u2019 equity"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestmentSummarizedFinancialInformationEquity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EquityInvesteesSummarizedAggregateFinancialInformationForEquityInvesteesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities":  {
                "auth_ref":  [
                    "r1",
                    "r109",
                    "r184",
                    "r185",
                    "r359"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of liabilities reported by an equity method investment of the entity.",
                            "label":  "Equity Method Investment, Summarized Financial Information, Liabilities",
                            "terseLabel":  "Notes payable"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestmentSummarizedFinancialInformationLiabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EquityInvesteesSummarizedAggregateFinancialInformationForEquityInvesteesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss":  {
                "auth_ref":  [
                    "r1",
                    "r109",
                    "r184",
                    "r185",
                    "r359"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of net income (loss) reported by an equity method investment of the entity.",
                            "label":  "Equity Method Investment, Summarized Financial Information, Net Income (Loss)",
                            "terseLabel":  "Earnings related to equity investees",
                            "verboseLabel":  "Net income"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EquityInvesteesAdditionalInformationDetails",
                    "http://www.stewart.com/role/EquityInvesteesSummarizedAggregateFinancialInformationForEquityInvesteesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue":  {
                "auth_ref":  [
                    "r1",
                    "r185"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of revenue from sale of product and rendering of service reported by equity method investee.",
                            "label":  "Equity Method Investment, Summarized Financial Information, Revenue",
                            "terseLabel":  "Net premium revenues from policies issued by equity investees",
                            "verboseLabel":  "Revenues"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestmentSummarizedFinancialInformationRevenue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EquityInvesteesAdditionalInformationDetails",
                    "http://www.stewart.com/role/EquityInvesteesSummarizedAggregateFinancialInformationForEquityInvesteesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquityMethodInvestments":  {
                "auth_ref":  [
                    "r25",
                    "r148",
                    "r182"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee.  This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.",
                            "label":  "Equity Method Investments",
                            "terseLabel":  "Investments in investees, on an equity method basis",
                            "verboseLabel":  "Investments in subsidiaries, on an equity-method basis"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquityMethodInvestmentsAndJointVenturesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Equity Method Investments and Joint Ventures [Abstract]"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestmentsAndJointVenturesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_EquityMethodInvestmentsDisclosureTextBlock":  {
                "auth_ref":  [
                    "r187",
                    "r348"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for equity method investments and joint ventures.  Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee.  Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.",
                            "label":  "Equity Method Investments and Joint Ventures Disclosure [Text Block]",
                            "terseLabel":  "Equity investees"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestmentsDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EquityInvestees"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_EquityMethodInvestmentsTextBlock":  {
                "auth_ref":  [
                    "r186"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of equity method investments including, but not limited to, name of each investee or group of investments, percentage ownership, difference between recorded amount of an investment and the value of the underlying equity in the net assets, and summarized financial information.",
                            "label":  "Equity Method Investments [Table Text Block]",
                            "terseLabel":  "Summary of aggregate financial information for equity investees"
                            }
                        }
                    },
                "localname":  "EquityMethodInvestmentsTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EquityInvesteesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_EquitySecuritiesFvNi":  {
                "auth_ref":  [
                    "r356"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesInvestmentsInDebtAndEquitySecuritiesDetails":  {
                        "order":  2.0,
                        "parentTag":  "stc_InvestmentsInDebtAndEquitySecurities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).",
                            "label":  "Equity Securities, FV-NI",
                            "terseLabel":  "Equity securities"
                            }
                        }
                    },
                "localname":  "EquitySecuritiesFvNi",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesInvestmentsInDebtAndEquitySecuritiesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquitySecuritiesFvNiGainLoss":  {
                "auth_ref":  [
                    "r180"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsNetGainsLossesOnInvestmentsInEquitySecuritiesStillHeldDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).",
                            "label":  "Equity Securities, FV-NI, Gain (Loss)",
                            "totalLabel":  "Total net investment gains (losses) recognized on equity securities during the period"
                            }
                        }
                    },
                "localname":  "EquitySecuritiesFvNiGainLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsNetGainsLossesOnInvestmentsInEquitySecuritiesStillHeldDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquitySecuritiesFvNiRealizedGain":  {
                "auth_ref":  [
                    "r180"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).",
                            "label":  "Equity Securities, FV-NI, Realized Gain",
                            "terseLabel":  "Realized gain of equity investment"
                            }
                        }
                    },
                "localname":  "EquitySecuritiesFvNiRealizedGain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquitySecuritiesFvNiRealizedGainLoss":  {
                "auth_ref":  [
                    "r180"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsNetGainsLossesOnInvestmentsInEquitySecuritiesStillHeldDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_EquitySecuritiesFvNiGainLoss",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).",
                            "label":  "Equity Securities, FV-NI, Realized Gain (Loss)",
                            "terseLabel":  "Less:  Net realized gains (losses) on equity securities sold during the period"
                            }
                        }
                    },
                "localname":  "EquitySecuritiesFvNiRealizedGainLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsNetGainsLossesOnInvestmentsInEquitySecuritiesStillHeldDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquitySecuritiesFvNiUnrealizedGain":  {
                "auth_ref":  [
                    "r180"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).",
                            "label":  "Equity Securities, FV-NI, Unrealized Gain",
                            "terseLabel":  "Net unrealized gain of equity investment"
                            }
                        }
                    },
                "localname":  "EquitySecuritiesFvNiUnrealizedGain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquitySecuritiesFvNiUnrealizedGainLoss":  {
                "auth_ref":  [
                    "r180"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_OtherNonoperatingGainsLosses",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsNetGainsLossesOnInvestmentsInEquitySecuritiesStillHeldDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_EquitySecuritiesFvNiGainLoss",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).",
                            "label":  "Equity Securities, FV-NI, Unrealized Gain (Loss)",
                            "negatedTerseLabel":  "Net unrealized investment losses recognized on equity securities still held",
                            "terseLabel":  "Net unrealized investment gains (losses) recognized on equity securities still held",
                            "verboseLabel":  "Net unrealized investment gains (losses) recognized on equity securities still held"
                            }
                        }
                    },
                "localname":  "EquitySecuritiesFvNiUnrealizedGainLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsAdditionalInformationDetails",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsNetGainsLossesOnInvestmentsInEquitySecuritiesStillHeldDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EquitySecuritiesMember":  {
                "auth_ref":  [
                    "r7",
                    "r12",
                    "r178",
                    "r415",
                    "r436",
                    "r480"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Ownership interest or right to acquire or dispose of ownership interest in corporations and other legal entities for which ownership interest is represented by shares of common or preferred stock, convertible securities, stock rights, or stock warrants.",
                            "label":  "Equity Securities [Member]",
                            "verboseLabel":  "Equity securities"
                            }
                        }
                    },
                "localname":  "EquitySecuritiesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsProceedsFromSaleOfInvestmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount":  {
                "auth_ref":  [
                    "r179"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of impairment loss on investment in equity security without readily determinable fair value.",
                            "label":  "Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount",
                            "terseLabel":  "Realized gains from sales of equity investments with no previously readily determinable fair value"
                            }
                        }
                    },
                "localname":  "EquitySecuritiesWithoutReadilyDeterminableFairValueImpairmentLossAnnualAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_EscrowDeposit":  {
                "auth_ref":  [
                    "r416"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property.  Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments.  This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.",
                            "label":  "Escrow Deposit",
                            "terseLabel":  "Contingent liability, escrow deposit"
                            }
                        }
                    },
                "localname":  "EscrowDeposit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ContingentLiabilitiesAndCommitmentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems":  {
                "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":  "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]",
                            "terseLabel":  "Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]"
                            }
                        }
                    },
                "localname":  "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable":  {
                "auth_ref":  [
                    "r350",
                    "r351",
                    "r352",
                    "r354"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about asset and liability measured at fair value on recurring and nonrecurring basis.",
                            "label":  "Fair Value, Recurring and Nonrecurring [Table]",
                            "terseLabel":  "Fair Value, Recurring and Nonrecurring [Table]"
                            }
                        }
                    },
                "localname":  "FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueAssetsMeasuredOnRecurringBasisTextBlock":  {
                "auth_ref":  [
                    "r350",
                    "r351"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis.  The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).",
                            "label":  "Fair Value, Assets Measured on Recurring Basis [Table Text Block]",
                            "terseLabel":  "Financial instruments measured at fair value on recurring basis"
                            }
                        }
                    },
                "localname":  "FairValueAssetsMeasuredOnRecurringBasisTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_FairValueByFairValueHierarchyLevelAxis":  {
                "auth_ref":  [
                    "r264",
                    "r265",
                    "r268",
                    "r351",
                    "r396"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by level within fair value hierarchy and fair value measured at net asset value per share as practical expedient.",
                            "label":  "Fair Value Hierarchy and NAV [Axis]",
                            "terseLabel":  "Fair Value Hierarchy and NAV [Axis]"
                            }
                        }
                    },
                "localname":  "FairValueByFairValueHierarchyLevelAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueDisclosuresAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Fair Value Disclosures [Abstract]"
                            }
                        }
                    },
                "localname":  "FairValueDisclosuresAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FairValueDisclosuresTextBlock":  {
                "auth_ref":  [
                    "r353"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities.  Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.",
                            "label":  "Fair Value Disclosures [Text Block]",
                            "terseLabel":  "Fair value measurements"
                            }
                        }
                    },
                "localname":  "FairValueDisclosuresTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurements"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_FairValueInputsLevel1Member":  {
                "auth_ref":  [
                    "r264",
                    "r265",
                    "r268",
                    "r351",
                    "r397"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Quoted prices in active markets for identical assets or liabilities that the reporting entity can access at the measurement date.",
                            "label":  "Fair Value, Inputs, Level 1 [Member]",
                            "terseLabel":  "Level 1"
                            }
                        }
                    },
                "localname":  "FairValueInputsLevel1Member",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FairValueInputsLevel2Member":  {
                "auth_ref":  [
                    "r264",
                    "r265",
                    "r268",
                    "r351",
                    "r398"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Inputs other than quoted prices included within level 1 that are observable for an asset or liability, either directly or indirectly, including, but not limited to, quoted prices for similar assets or liabilities in active markets, or quoted prices for identical or similar assets or liabilities in inactive markets.",
                            "label":  "Fair Value, Inputs, Level 2 [Member]",
                            "terseLabel":  "Level 2"
                            }
                        }
                    },
                "localname":  "FairValueInputsLevel2Member",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FairValueInputsLevel3Member":  {
                "auth_ref":  [
                    "r264",
                    "r265",
                    "r268",
                    "r351",
                    "r399"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.",
                            "label":  "Fair Value, Inputs, Level 3 [Member]",
                            "terseLabel":  "Level 3"
                            }
                        }
                    },
                "localname":  "FairValueInputsLevel3Member",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FairValueMeasurementsFairValueHierarchyDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Categories used to prioritize the inputs to valuation techniques to measure fair value.",
                            "label":  "Fair Value Hierarchy and NAV [Domain]",
                            "terseLabel":  "Fair Value Hierarchy and NAV [Domain]"
                            }
                        }
                    },
                "localname":  "FairValueMeasurementsFairValueHierarchyDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FairValueOfFinancialInstrumentsPolicy":  {
                "auth_ref":  [
                    "r107",
                    "r355",
                    "r358"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for determining the fair value of financial instruments.",
                            "label":  "Fair Value of Financial Instruments, Policy [Policy Text Block]",
                            "terseLabel":  "Fair values"
                            }
                        }
                    },
                "localname":  "FairValueOfFinancialInstrumentsPolicy",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Finance Lease, Liability, Payment, Due [Abstract]",
                            "terseLabel":  "Finance"
                            }
                        }
                    },
                "localname":  "FinanceLeaseLiabilitiesPaymentsDueAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FinanceLeaseLiability":  {
                "auth_ref":  [
                    "r378",
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails":  {
                        "order":  2.0,
                        "parentTag":  "stc_LeaseLiability",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetailsCalc2":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_FinanceLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Present value of lessee's discounted obligation for lease payments from finance lease.",
                            "label":  "Finance Lease, Liability",
                            "netLabel":  "Net future minimum lease payments",
                            "terseLabel":  "Finance lease liabilities",
                            "verboseLabel":  "Capital lease obligation"
                            }
                        }
                    },
                "localname":  "FinanceLeaseLiability",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails",
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails",
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock":  {
                "auth_ref":  [
                    "r389"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of undiscounted cash flows of finance lease liability.  Includes, but is not limited to, reconciliation of undiscounted cash flows to finance lease liability recognized in statement of financial position.",
                            "label":  "Finance Lease, Liability, Maturity [Table Text Block]",
                            "terseLabel":  "Future minimum lease payments under finance leases"
                            }
                        }
                    },
                "localname":  "FinanceLeaseLiabilityMaturityTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_FinanceLeaseLiabilityPaymentsDue":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetailsCalc2":  {
                        "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 finance lease.",
                            "label":  "Finance Lease, Liability, Payment, Due",
                            "totalLabel":  "Total future minimum lease payments"
                            }
                        }
                    },
                "localname":  "FinanceLeaseLiabilityPaymentsDue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_FinanceLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for finance lease, due after fifth fiscal year following latest fiscal year.",
                            "label":  "Finance Lease, Liability, Payments, Due after Year Five",
                            "terseLabel":  "Thereafter"
                            }
                        }
                    },
                "localname":  "FinanceLeaseLiabilityPaymentsDueAfterYearFive",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_FinanceLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in next fiscal year following latest fiscal year.",
                            "label":  "Finance Lease, Liability, Payments, Due Next Twelve Months",
                            "terseLabel":  "2020"
                            }
                        }
                    },
                "localname":  "FinanceLeaseLiabilityPaymentsDueNextTwelveMonths",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_FinanceLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fifth fiscal year following latest fiscal year.",
                            "label":  "Finance Lease, Liability, Payments, Due Year Five",
                            "terseLabel":  "2024"
                            }
                        }
                    },
                "localname":  "FinanceLeaseLiabilityPaymentsDueYearFive",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_FinanceLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fourth fiscal year following latest fiscal year.",
                            "label":  "Finance Lease, Liability, Payments, Due Year Four",
                            "terseLabel":  "2023"
                            }
                        }
                    },
                "localname":  "FinanceLeaseLiabilityPaymentsDueYearFour",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_FinanceLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in third fiscal year following latest fiscal year.",
                            "label":  "Finance Lease, Liability, Payments, Due Year Three",
                            "terseLabel":  "2022"
                            }
                        }
                    },
                "localname":  "FinanceLeaseLiabilityPaymentsDueYearThree",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_FinanceLeaseLiabilityPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's undiscounted obligation for lease payments for finance lease, due in second fiscal year following latest fiscal year.",
                            "label":  "Finance Lease, Liability, Payments, Due Year Two",
                            "terseLabel":  "2021"
                            }
                        }
                    },
                "localname":  "FinanceLeaseLiabilityPaymentsDueYearTwo",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetailsCalc2":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_FinanceLeaseLiabilityPaymentsDue",
                        "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 finance lease.",
                            "label":  "Finance Lease, Liability, Undiscounted Excess Amount",
                            "negatedLabel":  "Less: imputed interest"
                            }
                        }
                    },
                "localname":  "FinanceLeaseLiabilityUndiscountedExcessAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinanceLeasePrincipalPayments":  {
                "auth_ref":  [
                    "r380",
                    "r384"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash outflow for principal payment on finance lease.",
                            "label":  "Finance Lease, Principal Payments",
                            "terseLabel":  "Cash paid for amounts included in the measurement of lease liabilities ($000)"
                            }
                        }
                    },
                "localname":  "FinanceLeasePrincipalPayments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesOtherInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinanceLeaseRightOfUseAsset":  {
                "auth_ref":  [
                    "r377"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails":  {
                        "order":  2.0,
                        "parentTag":  "stc_LeaseRightOfUseAsset",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of lessee's right to use underlying asset under finance lease.",
                            "label":  "Finance Lease, Right-of-Use Asset",
                            "terseLabel":  "Finance lease assets, net of accumulated depreciation"
                            }
                        }
                    },
                "localname":  "FinanceLeaseRightOfUseAsset",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FinanceLeaseWeightedAverageDiscountRatePercent":  {
                "auth_ref":  [
                    "r387",
                    "r390"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average discount rate for finance lease calculated at point in time.",
                            "label":  "Finance Lease, Weighted Average Discount Rate, Percent",
                            "terseLabel":  "Weighted average discount rate"
                            }
                        }
                    },
                "localname":  "FinanceLeaseWeightedAverageDiscountRatePercent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesOtherInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1":  {
                "auth_ref":  [
                    "r386",
                    "r390"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.",
                            "label":  "Finance Lease, Weighted Average Remaining Lease Term",
                            "terseLabel":  "Weighted average remaining lease term (years):"
                            }
                        }
                    },
                "localname":  "FinanceLeaseWeightedAverageRemainingLeaseTerm1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesOtherInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_FinancialInstrumentAxis":  {
                "auth_ref":  [
                    "r188",
                    "r190",
                    "r191",
                    "r192",
                    "r194",
                    "r199",
                    "r201",
                    "r202",
                    "r203"
                    ],
                "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.stewart.com/role/FairValueMeasurementsDetails",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsProceedsFromSaleOfInvestmentDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAmortizedCostsAndFairValuesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedGainsAndLossesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "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":  "Intangible assets estimated life (years)"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetUsefulLife",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralOtherIntangiblesDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization":  {
                "auth_ref":  [
                    "r217"
                    ],
                "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 of other intangibles"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAccumulatedAmortization",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths":  {
                "auth_ref":  [
                    "r219"
                    ],
                "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":  "Expected amortization expense in 2020"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive":  {
                "auth_ref":  [
                    "r219"
                    ],
                "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":  "Expected amortization expense in 2024"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAmortizationExpenseYearFive",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour":  {
                "auth_ref":  [
                    "r219"
                    ],
                "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":  "Expected amortization expense in 2023"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAmortizationExpenseYearFour",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree":  {
                "auth_ref":  [
                    "r219"
                    ],
                "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":  "Expected amortization expense in 2022"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAmortizationExpenseYearThree",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo":  {
                "auth_ref":  [
                    "r219"
                    ],
                "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":  "Expected amortization expense in 2021"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis":  {
                "auth_ref":  [
                    "r212",
                    "r214",
                    "r217",
                    "r220",
                    "r401"
                    ],
                "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.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]",
                            "terseLabel":  "Future amortization expense"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsFutureAmortizationExpenseAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsGross":  {
                "auth_ref":  [
                    "r217",
                    "r401"
                    ],
                "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":  "Other intangibles, gross carrying amount"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "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":  "Finite-Lived Intangible Assets [Line Items]"
                            }
                        }
                    },
                "localname":  "FiniteLivedIntangibleAssetsLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralOtherIntangiblesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain":  {
                "auth_ref":  [
                    "r212",
                    "r216"
                    ],
                "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.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "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.stewart.com/role/IncomeTaxesAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ForeignGovernmentDebtSecuritiesMember":  {
                "auth_ref":  [
                    "r264",
                    "r474"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debt security issued by government not domiciled in United States of America (US).",
                            "label":  "Debt Security, Government, Non-US [Member]",
                            "terseLabel":  "Foreign"
                            }
                        }
                    },
                "localname":  "ForeignGovernmentDebtSecuritiesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAmortizedCostsAndFairValuesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedGainsAndLossesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_FurnitureAndFixturesGross":  {
                "auth_ref":  [
                    "r226"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_PropertyPlantAndEquipmentNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before accumulated depreciation of 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, Gross",
                            "terseLabel":  "Furniture and equipment"
                            }
                        }
                    },
                "localname":  "FurnitureAndFixturesGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "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.stewart.com/role/GeneralPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_GainLossOnContractTermination":  {
                "auth_ref":  [
                    "r98",
                    "r232"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_Revenues",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Gain (loss) related to the termination of a contract between the parties.  The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.",
                            "label":  "Gain (Loss) on Contract Termination",
                            "terseLabel":  "Gain realized from termination fee paid by FNF",
                            "verboseLabel":  "Merger termination fee"
                            }
                        }
                    },
                "localname":  "GainLossOnContractTermination",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralMergerAgreementTerminationDetails",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails",
                    "http://www.stewart.com/role/SegmentInformationAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_GainLossOnDispositionOfAssets1":  {
                "auth_ref":  [
                    "r97"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.",
                            "label":  "Gain (Loss) on Disposition of Assets",
                            "negatedTerseLabel":  "Net realized (gains) losses on the transactions"
                            }
                        }
                    },
                "localname":  "GainLossOnDispositionOfAssets1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_Goodwill":  {
                "auth_ref":  [
                    "r204",
                    "r205"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "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":  "Ending balances",
                            "periodStartLabel":  "Beginning balances",
                            "terseLabel":  "Goodwill"
                            }
                        }
                    },
                "localname":  "Goodwill",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesSummaryOfGoodwillDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_GoodwillAcquiredDuringPeriod":  {
                "auth_ref":  [
                    "r206"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.",
                            "label":  "Goodwill, Acquired During Period",
                            "terseLabel":  "Acquisitions",
                            "verboseLabel":  "Increase in goodwill"
                            }
                        }
                    },
                "localname":  "GoodwillAcquiredDuringPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails",
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesSummaryOfGoodwillDetails"
                    ],
                "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_GoodwillAndIntangibleAssetsDisclosureTextBlock":  {
                "auth_ref":  [
                    "r222"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for goodwill and intangible assets.",
                            "label":  "Goodwill and Intangible Assets Disclosure [Text Block]",
                            "terseLabel":  "Goodwill and other intangibles"
                            }
                        }
                    },
                "localname":  "GoodwillAndIntangibleAssetsDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangibles"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_GoodwillAndIntangibleAssetsGoodwillPolicy":  {
                "auth_ref":  [
                    "r107",
                    "r208"
                    ],
                "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.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_GoodwillLineItems":  {
                "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":  "Goodwill [Line Items]",
                            "terseLabel":  "Goodwill [Line Items]"
                            }
                        }
                    },
                "localname":  "GoodwillLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesSummaryOfGoodwillDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "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 summary"
                            }
                        }
                    },
                "localname":  "GoodwillRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesSummaryOfGoodwillDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit":  {
                "auth_ref":  [
                    "r207"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of divestiture 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, Written off Related to Sale of Business Unit",
                            "negatedTerseLabel":  "Disposals"
                            }
                        }
                    },
                "localname":  "GoodwillWrittenOffRelatedToSaleOfBusinessUnit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesSummaryOfGoodwillDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ImpairmentOfIntangibleAssetsFinitelived":  {
                "auth_ref":  [
                    "r97",
                    "r221"
                    ],
                "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",
                            "verboseLabel":  "Impairment of long-lived assets"
                            }
                        }
                    },
                "localname":  "ImpairmentOfIntangibleAssetsFinitelived",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralImpairmentOfLongLivedAssetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock":  {
                "auth_ref":  [
                    "r107",
                    "r223",
                    "r231"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for recognizing and measuring the impairment of long-lived assets.  An entity also may disclose its accounting policy for long-lived assets to be sold.  This policy excludes goodwill and intangible assets.",
                            "label":  "Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]",
                            "terseLabel":  "Impairment of long-lived assets"
                            }
                        }
                    },
                "localname":  "ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest":  {
                "auth_ref":  [
                    "r65",
                    "r125",
                    "r402",
                    "r420",
                    "r457"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_ProfitLoss",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetIncomeLoss",
                        "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",
                            "terseLabel":  "Income (loss) before taxes and noncontrolling interest",
                            "totalLabel":  "Income before taxes and noncontrolling interests",
                            "verboseLabel":  "Income before taxes and income from subsidiaries"
                            }
                        }
                    },
                "localname":  "IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails",
                    "http://www.stewart.com/role/SegmentInformationSelectedStatementOfOperationsAndIncomeLossInformationRelatedToSegmentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeLossFromEquityMethodInvestments":  {
                "auth_ref":  [
                    "r66",
                    "r97",
                    "r145",
                    "r182",
                    "r419",
                    "r453"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  11.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "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",
                            "negatedLabel":  "Income from subsidiaries",
                            "negatedTerseLabel":  "Net income from equity investees"
                            }
                        }
                    },
                "localname":  "IncomeLossFromEquityMethodInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "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_IncomeTaxAuthorityAxis":  {
                "auth_ref":  [
                    "r299"
                    ],
                "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.stewart.com/role/IncomeTaxesAdditionalInformationDetails",
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseAdditionalInformationDetails"
                    ],
                "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.stewart.com/role/IncomeTaxesAdditionalInformationDetails",
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_IncomeTaxContingencyLineItems":  {
                "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":  "Income Tax Contingency [Line Items]",
                            "terseLabel":  "Income Tax Contingency [Line Items]"
                            }
                        }
                    },
                "localname":  "IncomeTaxContingencyLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncomeTaxContingencyTable":  {
                "auth_ref":  [
                    "r300",
                    "r301",
                    "r303",
                    "r317"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies.  Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months.",
                            "label":  "Income Tax Contingency [Table]",
                            "terseLabel":  "Income Tax Contingency [Table]"
                            }
                        }
                    },
                "localname":  "IncomeTaxContingencyTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "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":  [
                    "r324"
                    ],
                "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.stewart.com/role/IncomeTaxes"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_IncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r112",
                    "r146",
                    "r321"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_ProfitLoss",
                        "weight":  -1.0
                        },
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetIncomeLoss",
                        "weight":  -1.0
                        }
                    },
                "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)",
                            "negatedLabel":  "Income tax (expense) benefit",
                            "terseLabel":  "Income tax expense",
                            "totalLabel":  "Total income tax expense"
                            }
                        }
                    },
                "localname":  "IncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/IncomeTaxesIncomeTaxExpenseBenefitDetails",
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxPolicyTextBlock":  {
                "auth_ref":  [
                    "r59",
                    "r107",
                    "r294",
                    "r295",
                    "r302",
                    "r303",
                    "r309",
                    "r323",
                    "r485"
                    ],
                "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.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_IncomeTaxReceivable":  {
                "auth_ref":  [
                    "r23",
                    "r433"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_PremiumsAndOtherReceivablesNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying amount as of the balance sheet date of income taxes previously overpaid to tax authorities (such as U.S.  Federal, state and local tax authorities) representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.  Also called income tax refund receivable.",
                            "label":  "Income Taxes Receivable",
                            "terseLabel":  "Income taxes"
                            }
                        }
                    },
                "localname":  "IncomeTaxReceivable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance":  {
                "auth_ref":  [
                    "r293",
                    "r297",
                    "r298"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails":  {
                        "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":  "Valuation allowance"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate":  {
                "auth_ref":  [
                    "r292",
                    "r297",
                    "r298"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails":  {
                        "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 the income tax rates.",
                            "label":  "Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount",
                            "terseLabel":  "2017 Act impact from the U.S. corporate tax rate change"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationChangeInEnactedTaxRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential":  {
                "auth_ref":  [
                    "r110",
                    "r297",
                    "r298"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails":  {
                        "order":  8.0,
                        "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":  "Net expense (benefit) for the Canadian branch"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationForeignIncomeTaxRateDifferential",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate":  {
                "auth_ref":  [
                    "r111",
                    "r297",
                    "r298"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails":  {
                        "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":  "Expected income tax expense at 21% in 2019 and 2018 and 35% in 2017"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationNondeductibleExpense":  {
                "auth_ref":  [
                    "r297",
                    "r298"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails":  {
                        "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 nondeductible expenses.",
                            "label":  "Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount",
                            "terseLabel":  "Nondeductible expenses"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationNondeductibleExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationOtherAdjustments":  {
                "auth_ref":  [
                    "r297"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails":  {
                        "order":  7.0,
                        "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":  "Return-to-provision and true-up adjustments"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationOtherAdjustments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationOtherReconcilingItems":  {
                "auth_ref":  [
                    "r297",
                    "r298"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails":  {
                        "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 tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.",
                            "label":  "Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount",
                            "terseLabel":  "Other \u2013 net"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationOtherReconcilingItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxReconciliationTaxCreditsResearch":  {
                "auth_ref":  [
                    "r297",
                    "r298"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_IncomeTaxExpenseBenefit",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "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 research tax credit.",
                            "label":  "Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount",
                            "negatedTerseLabel":  "Research and development credits"
                            }
                        }
                    },
                "localname":  "IncomeTaxReconciliationTaxCreditsResearch",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncomeTaxesPaidNet":  {
                "auth_ref":  [
                    "r102"
                    ],
                "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, net of any cash received during the current period as refunds for the overpayment of taxes.",
                            "label":  "Income Taxes Paid, Net",
                            "terseLabel":  "Income taxes \u2013 net paid (refunded)",
                            "verboseLabel":  "Income taxes paid"
                            }
                        }
                    },
                "localname":  "IncomeTaxesPaidNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities":  {
                "auth_ref":  [
                    "r96"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  9.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "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":  "Increase (decrease) in payables and accrued liabilities \u2013 net",
                            "verboseLabel":  "Increase (decrease) in payables and accrued liabilities \u2013 net"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInAccountsPayableAndAccruedLiabilities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInDeferredIncomeTaxes":  {
                "auth_ref":  [
                    "r96"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  10.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The increase (decrease) during the reporting period in the account that represents the temporary difference that results from Income or Loss that is recognized for accounting purposes but not for tax purposes and vice versa.",
                            "label":  "Increase (Decrease) in Deferred Income Taxes",
                            "negatedLabel":  "Change in net deferred income taxes"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInDeferredIncomeTaxes",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve":  {
                "auth_ref":  [
                    "r96"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.",
                            "label":  "Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve",
                            "terseLabel":  "Payments for title losses (in excess of) less than provisions"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInLiabilityForClaimsAndClaimsAdjustmentExpenseReserve",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInNotesReceivables":  {
                "auth_ref":  [
                    "r96"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The increase (decrease) during the reporting period of the amounts due from borrowers for outstanding secured or unsecured loans evidenced by a note.",
                            "label":  "Increase (Decrease) in Notes Receivables",
                            "negatedLabel":  "Increases in notes receivables"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInNotesReceivables",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInOtherOperatingAssets":  {
                "auth_ref":  [
                    "r96"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  8.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "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":  "Decrease (increase) in other assets \u2013 net",
                            "negatedTerseLabel":  "Decrease (increase) in other assets \u2013 net"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInOtherOperatingAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IncreaseDecreaseInReceivables":  {
                "auth_ref":  [
                    "r96"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.",
                            "label":  "Increase (Decrease) in Receivables",
                            "negatedLabel":  "(Increase) decrease in receivables \u2013 net",
                            "negatedTerseLabel":  "(Increase) decrease in receivables \u2013 net"
                            }
                        }
                    },
                "localname":  "IncreaseDecreaseInReceivables",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "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.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements":  {
                "auth_ref":  [
                    "r131",
                    "r136"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/EarningsPerShareDetails":  {
                        "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":  "Average number of dilutive shares relating to restricted shares and units (in shares)"
                            }
                        }
                    },
                "localname":  "IncrementalCommonSharesAttributableToShareBasedPaymentArrangements",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EarningsPerShareDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_InsuranceAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Insurance [Abstract]"
                            }
                        }
                    },
                "localname":  "InsuranceAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_InsuranceCommissions":  {
                "auth_ref":  [
                    "r452"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_BenefitsLossesAndExpenses",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The expense incurred by an insurance company to persons or entities for generating or placing insurance or investment contracts with the company, usually determined as a percentage of policy or contract premiums.  Excludes advances or draws to be applied against commissions earned.",
                            "label":  "Insurance Commissions",
                            "terseLabel":  "Amounts retained by agencies"
                            }
                        }
                    },
                "localname":  "InsuranceCommissions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_IntangibleAssetsFiniteLivedPolicy":  {
                "auth_ref":  [
                    "r107",
                    "r216"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for finite-lived intangible assets.  This accounting policy also might address: (1) the amortization method used; (2) the useful lives of such assets; and (3) how the entity assesses and measures impairment of such assets.",
                            "label":  "Intangible Assets, Finite-Lived, Policy [Policy Text Block]",
                            "terseLabel":  "Other intangibles"
                            }
                        }
                    },
                "localname":  "IntangibleAssetsFiniteLivedPolicy",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_IntangibleAssetsNetExcludingGoodwill":  {
                "auth_ref":  [
                    "r210",
                    "r215"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "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":  "Intangible assets, net of amortization"
                            }
                        }
                    },
                "localname":  "IntangibleAssetsNetExcludingGoodwill",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_InterestExpense":  {
                "auth_ref":  [
                    "r63",
                    "r144",
                    "r366",
                    "r369",
                    "r423"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_BenefitsLossesAndExpenses",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of the cost of borrowed funds accounted for as interest expense.",
                            "label":  "Interest Expense",
                            "terseLabel":  "Interest"
                            }
                        }
                    },
                "localname":  "InterestExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_InterestPaidNet":  {
                "auth_ref":  [
                    "r89",
                    "r93",
                    "r102"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash paid for interest, excluding capitalized interest, classified as operating activity.  Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.",
                            "label":  "Interest Paid, Excluding Capitalized Interest, Operating Activities",
                            "terseLabel":  "Interest paid"
                            }
                        }
                    },
                "localname":  "InterestPaidNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_InvestmentTypeAxis":  {
                "auth_ref":  [
                    "r476",
                    "r477",
                    "r478",
                    "r479"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of investments.",
                            "label":  "Investment Type [Axis]",
                            "terseLabel":  "Schedule of Fair Value of Separate Accounts by Major Category of Investment [Axis]"
                            }
                        }
                    },
                "localname":  "InvestmentTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_InvestmentTypeCategorizationMember":  {
                "auth_ref":  [
                    "r476",
                    "r477",
                    "r478",
                    "r479"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Asset obtained to generate income or appreciate in value.",
                            "label":  "Investments [Domain]",
                            "terseLabel":  "Schedule of Fair Value of Separate Accounts by Major Category of Investment, Category [Domain]"
                            }
                        }
                    },
                "localname":  "InvestmentTypeCategorizationMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.",
                            "label":  "Investments Classified by Contractual Maturity Date [Table Text Block]",
                            "terseLabel":  "Debt securities according to contractual terms"
                            }
                        }
                    },
                "localname":  "InvestmentsClassifiedByContractualMaturityDateTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Investments, Debt and Equity Securities [Abstract]"
                            }
                        }
                    },
                "localname":  "InvestmentsDebtAndEquitySecuritiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock":  {
                "auth_ref":  [
                    "r178",
                    "r403",
                    "r429",
                    "r481"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for  investments in certain debt and equity securities.",
                            "label":  "Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]",
                            "terseLabel":  "Investments in debt and equity securities",
                            "verboseLabel":  "Investment income and net realized and unrealized gains"
                            }
                        }
                    },
                "localname":  "InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGains",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecurities"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_LaborAndRelatedExpense":  {
                "auth_ref":  [
                    "r70"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_BenefitsLossesAndExpenses",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.",
                            "label":  "Labor and Related Expense",
                            "terseLabel":  "Employee costs"
                            }
                        }
                    },
                "localname":  "LaborAndRelatedExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_Land":  {
                "auth_ref":  [
                    "r4",
                    "r27"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_PropertyPlantAndEquipmentNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.",
                            "label":  "Land",
                            "terseLabel":  "Land"
                            }
                        }
                    },
                "localname":  "Land",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LeaseCostTableTextBlock":  {
                "auth_ref":  [
                    "r388"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of lessee's lease cost.  Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income.",
                            "label":  "Lease, Cost [Table Text Block]",
                            "terseLabel":  "Other information related to operating and finance leases"
                            }
                        }
                    },
                "localname":  "LeaseCostTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_LeasesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Leases [Abstract]"
                            }
                        }
                    },
                "localname":  "LeasesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LegalMattersAndContingenciesTextBlock":  {
                "auth_ref":  [
                    "r243"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for legal proceedings, legal contingencies, litigation, regulatory and environmental matters and other contingencies.",
                            "label":  "Legal Matters and Contingencies [Text Block]",
                            "terseLabel":  "Regulatory and legal developments"
                            }
                        }
                    },
                "localname":  "LegalMattersAndContingenciesTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/RegulatoryAndLegalDevelopments"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_LesseeFinanceLeaseDescriptionAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Lessee, Finance Lease, Description [Abstract]",
                            "terseLabel":  "Finance"
                            }
                        }
                    },
                "localname":  "LesseeFinanceLeaseDescriptionAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesOtherInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LesseeFinanceLeasesTextBlock":  {
                "auth_ref":  [
                    "r391"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for finance leases of lessee.  Includes, but is not limited to, description of lessee's finance lease and maturity analysis of finance lease liability.",
                            "label":  "Lessee, Finance Leases [Text Block]",
                            "terseLabel":  "Leases"
                            }
                        }
                    },
                "localname":  "LesseeFinanceLeasesTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/Leases"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_LesseeLeasesPolicyTextBlock":  {
                "auth_ref":  [
                    "r382"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for leasing arrangement entered into by lessee.",
                            "label":  "Lessee, Leases [Policy Text Block]",
                            "terseLabel":  "Leases"
                            }
                        }
                    },
                "localname":  "LesseeLeasesPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_LesseeOperatingLeaseDescriptionAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Lessee, Operating Lease, Description [Abstract]",
                            "terseLabel":  "Operating"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseDescriptionAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesOtherInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock":  {
                "auth_ref":  [
                    "r389"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of undiscounted cash flows of lessee's operating lease liability.  Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position.",
                            "label":  "Lessee, Operating Lease, Liability, Maturity [Table Text Block]",
                            "terseLabel":  "Future minimum lease payments under operating leases"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityMaturityTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetailsCalc2":  {
                        "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 future minimum lease payments"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "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.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "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, due in next fiscal year following latest fiscal year.",
                            "label":  "Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months",
                            "terseLabel":  "2020"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "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.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "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.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "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.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails":  {
                        "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.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount":  {
                "auth_ref":  [
                    "r389"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetailsCalc2":  {
                        "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",
                            "negatedLabel":  "Less: imputed interest"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeaseLiabilityUndiscountedExcessAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LesseeOperatingLeasesTextBlock":  {
                "auth_ref":  [
                    "r391"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for operating leases of lessee.  Includes, but is not limited to, description of operating lease and maturity analysis of operating lease liability.",
                            "label":  "Lessee, Operating Leases [Text Block]",
                            "terseLabel":  "Leases"
                            }
                        }
                    },
                "localname":  "LesseeOperatingLeasesTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/Leases"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "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":  "Letter of Credit"
                            }
                        }
                    },
                "localname":  "LetterOfCreditMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_Liabilities":  {
                "auth_ref":  [
                    "r32"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  3.0,
                        "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.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LiabilitiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Liabilities [Abstract]",
                            "terseLabel":  "Liabilities",
                            "verboseLabel":  "Liabilities:"
                            }
                        }
                    },
                "localname":  "LiabilitiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LiabilitiesAndStockholdersEquity":  {
                "auth_ref":  [
                    "r22",
                    "r411",
                    "r446"
                    ],
                "calculation":  {
                    "http://www.stewart.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' equity"
                            }
                        }
                    },
                "localname":  "LiabilitiesAndStockholdersEquity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpense":  {
                "auth_ref":  [
                    "r462",
                    "r465"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.",
                            "label":  "Liability for Claims and Claims Adjustment Expense",
                            "periodEndLabel":  "Balances at end of period",
                            "periodStartLabel":  "Balances at beginning of period",
                            "terseLabel":  "Estimated title losses"
                            }
                        }
                    },
                "localname":  "LiabilityForClaimsAndClaimsAdjustmentExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1":  {
                "auth_ref":  [
                    "r464"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_PaymentsForLossesAndLossAdjustmentExpense",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs.",
                            "label":  "Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year",
                            "negatedLabel":  "Current year"
                            }
                        }
                    },
                "localname":  "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidCurrentYear1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1":  {
                "auth_ref":  [
                    "r464"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_PaymentsForLossesAndLossAdjustmentExpense",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs.",
                            "label":  "Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years",
                            "negatedLabel":  "Previous policy years"
                            }
                        }
                    },
                "localname":  "LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseClaimsPaidPriorYears1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LineOfCredit":  {
                "auth_ref":  [
                    "r13",
                    "r409",
                    "r435"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/NotesPayableSummaryOfNotesPayableDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_LongTermDebt",
                        "weight":  1.0
                        }
                    },
                "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":  "Line of credit facility",
                            "verboseLabel":  "Bank line of credit facility, outstanding"
                            }
                        }
                    },
                "localname":  "LineOfCredit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails",
                    "http://www.stewart.com/role/NotesPayableSummaryOfNotesPayableDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LineOfCreditFacilityCommitmentFeePercentage":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.",
                            "label":  "Line of Credit Facility, Commitment Fee Percentage",
                            "terseLabel":  "Commitment fee (as a percent)"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityCommitmentFeePercentage",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity":  {
                "auth_ref":  [
                    "r30"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.",
                            "label":  "Line of Credit Facility, Current Borrowing Capacity",
                            "terseLabel":  "Bank line of credit facility amount"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityCurrentBorrowingCapacity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity":  {
                "auth_ref":  [
                    "r30"
                    ],
                "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":  "Remaining borrowing capacity"
                            }
                        }
                    },
                "localname":  "LineOfCreditFacilityRemainingBorrowingCapacity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LineOfCreditMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A contractual arrangement with a lender under which borrowings can be made up to a specific amount at any point in time, and under which borrowings outstanding may be either short-term or long-term, depending upon the particulars.",
                            "label":  "Line of Credit [Member]",
                            "terseLabel":  "Line of Credit"
                            }
                        }
                    },
                "localname":  "LineOfCreditMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "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":  "LIBOR"
                            }
                        }
                    },
                "localname":  "LondonInterbankOfferedRateLIBORMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LongTermDebt":  {
                "auth_ref":  [
                    "r13",
                    "r249",
                    "r409",
                    "r441"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/NotesPayableSummaryOfNotesPayableDetails":  {
                        "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":  "Notes payable",
                            "totalLabel":  "Notes payable"
                            }
                        }
                    },
                "localname":  "LongTermDebt",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/NotesPayableSummaryOfNotesPayableDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":  {
                "auth_ref":  [
                    "r121",
                    "r247"
                    ],
                "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":  "Principal payments on notes in 2020"
                            }
                        }
                    },
                "localname":  "LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":  {
                "auth_ref":  [
                    "r121",
                    "r247"
                    ],
                "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":  "Principal payments on notes in 2023"
                            }
                        }
                    },
                "localname":  "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":  {
                "auth_ref":  [
                    "r121",
                    "r247"
                    ],
                "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":  "Principal payments on notes in 2022"
                            }
                        }
                    },
                "localname":  "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":  {
                "auth_ref":  [
                    "r121",
                    "r247"
                    ],
                "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":  "Principal payments on notes in 2021"
                            }
                        }
                    },
                "localname":  "LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_LongtermDebtTypeAxis":  {
                "auth_ref":  [
                    "r33"
                    ],
                "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.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LongtermDebtTypeDomain":  {
                "auth_ref":  [
                    "r33",
                    "r248"
                    ],
                "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.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_LossContingenciesByNatureOfContingencyAxis":  {
                "auth_ref":  [
                    "r236",
                    "r237",
                    "r238",
                    "r239",
                    "r240",
                    "r241",
                    "r242",
                    "r244",
                    "r245"
                    ],
                "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.stewart.com/role/ContingentLiabilitiesAndCommitmentsDetails",
                    "http://www.stewart.com/role/EstimatedTitleLossesAdditionalInformationDetails"
                    ],
                "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.stewart.com/role/ContingentLiabilitiesAndCommitmentsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LossContingenciesTable":  {
                "auth_ref":  [
                    "r236",
                    "r237",
                    "r238",
                    "r239",
                    "r240",
                    "r241",
                    "r242",
                    "r244",
                    "r245"
                    ],
                "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.stewart.com/role/ContingentLiabilitiesAndCommitmentsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LossContingencyAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Loss Contingency [Abstract]"
                            }
                        }
                    },
                "localname":  "LossContingencyAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LossContingencyAccrualRollForward":  {
                "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":  "Loss Contingency Accrual [Roll Forward]",
                            "terseLabel":  "Loss Contingency Accrual"
                            }
                        }
                    },
                "localname":  "LossContingencyAccrualRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LossContingencyEstimateAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Loss Contingency, Estimate [Abstract]",
                            "terseLabel":  "Loss ratios as a percentage of title operating revenues:"
                            }
                        }
                    },
                "localname":  "LossContingencyEstimateAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_LossContingencyNatureDomain":  {
                "auth_ref":  [
                    "r236",
                    "r237",
                    "r238",
                    "r239",
                    "r240",
                    "r241",
                    "r242",
                    "r244",
                    "r245"
                    ],
                "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.stewart.com/role/ContingentLiabilitiesAndCommitmentsDetails",
                    "http://www.stewart.com/role/EstimatedTitleLossesAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_MarketableSecuritiesPolicy":  {
                "auth_ref":  [
                    "r428"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of accounting policy for investment classified as marketable security.",
                            "label":  "Marketable Securities, Policy [Policy Text Block]",
                            "terseLabel":  "Investments in debt and equity securities"
                            }
                        }
                    },
                "localname":  "MarketableSecuritiesPolicy",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_MinorityInterest":  {
                "auth_ref":  [
                    "r37",
                    "r410",
                    "r445"
                    ],
                "calculation":  {
                    "http://www.stewart.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 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.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders":  {
                "auth_ref":  [
                    "r256"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.",
                            "label":  "Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders",
                            "negatedLabel":  "Distributions to noncontrolling interests"
                            }
                        }
                    },
                "localname":  "MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_MinorityInterestDecreaseFromRedemptions":  {
                "auth_ref":  [
                    "r256",
                    "r335",
                    "r336"
                    ],
                "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":  "Purchase of remaining interest of consolidated subsidiary"
                            }
                        }
                    },
                "localname":  "MinorityInterestDecreaseFromRedemptions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "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":  "Movement in Valuation Allowances and Reserves"
                            }
                        }
                    },
                "localname":  "MovementInValuationAllowancesAndReservesRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIiValuationAndQualifyingAccountsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NetCashProvidedByUsedInFinancingActivities":  {
                "auth_ref":  [
                    "r92"
                    ],
                "calculation":  {
                    "http://www.stewart.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 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":  "Cash used by financing activities"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInFinancingActivities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Net Cash Provided by (Used in) Financing Activities [Abstract]",
                            "terseLabel":  "Financing activities:"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInFinancingActivitiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NetCashProvidedByUsedInInvestingActivities":  {
                "auth_ref":  [
                    "r92"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "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":  "Cash provided (used) by investing activities"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInInvestingActivities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Net Cash Provided by (Used in) Investing Activities [Abstract]",
                            "terseLabel":  "Investing activities:"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInInvestingActivitiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NetCashProvidedByUsedInOperatingActivities":  {
                "auth_ref":  [
                    "r92",
                    "r95",
                    "r98"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  4.0,
                        "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":  "Cash provided (used) by operating activities"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInOperatingActivities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Net Cash Provided by (Used in) Operating Activities [Abstract]",
                            "terseLabel":  "Reconciliation of net income to cash provided by operating activities:",
                            "verboseLabel":  "Reconciliation of net income to cash provided (used) by operating activities:"
                            }
                        }
                    },
                "localname":  "NetCashProvidedByUsedInOperatingActivitiesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NetIncomeLoss":  {
                "auth_ref":  [
                    "r53",
                    "r56",
                    "r67",
                    "r98",
                    "r136",
                    "r421",
                    "r454"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails":  {
                        "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",
                            "netLabel":  "Net income attributable to Stewart",
                            "terseLabel":  "Net income (loss) attributable to Stewart",
                            "totalLabel":  "Net income attributable to Stewart",
                            "verboseLabel":  "Net (loss) income attributable to Stewart"
                            }
                        }
                    },
                "localname":  "NetIncomeLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity",
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/EarningsPerShareDetails",
                    "http://www.stewart.com/role/QuarterlyFinancialInformationUnauditedDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetIncomeLossAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Net Income (Loss) Attributable to Parent [Abstract]",
                            "terseLabel":  "Numerator:"
                            }
                        }
                    },
                "localname":  "NetIncomeLossAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EarningsPerShareDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NetIncomeLossAttributableToNoncontrollingInterest":  {
                "auth_ref":  [
                    "r53",
                    "r56",
                    "r339",
                    "r344"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "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 attributable to noncontrolling interests",
                            "verboseLabel":  "Net income attributable to noncontrolling interests"
                            }
                        }
                    },
                "localname":  "NetIncomeLossAttributableToNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity",
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NetInvestmentIncome":  {
                "auth_ref":  [
                    "r456"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_Revenues",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_Revenues",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after investment expense, of income earned from investments in securities and real estate.  Includes, but is not limited to, real estate investment, policy loans, dividends, and interest.  Excludes realized gain (loss) on investments.",
                            "label":  "Net Investment Income",
                            "terseLabel":  "Investment income"
                            }
                        }
                    },
                "localname":  "NetInvestmentIncome",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NewAccountingPrinciplesEarlyAdoptionMember":  {
                "auth_ref":  [
                    "r124",
                    "r126"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Represents a group of guidance that has been adopted early.",
                            "label":  "New Accounting Principles, Early Adoption [Domain]",
                            "terseLabel":  "New Accounting Principles, Early Adoption [Domain]"
                            }
                        }
                    },
                "localname":  "NewAccountingPrinciplesEarlyAdoptionMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralInvestmentsInDebtAndEquitySecuritiesDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_NewAccountingPronouncementEarlyAdoptionAxis":  {
                "auth_ref":  [
                    "r124",
                    "r126"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The financial statement line items and the effect of the guidance on financial statement line items by guidance implemented if the entity elects earlier application.",
                            "label":  "New Accounting Pronouncement, Early Adoption [Axis]",
                            "terseLabel":  "New Accounting Pronouncement, Early Adoption [Axis]"
                            }
                        }
                    },
                "localname":  "NewAccountingPronouncementEarlyAdoptionAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralInvestmentsInDebtAndEquitySecuritiesDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "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.stewart.com/role/GeneralRecentlyAdoptedAccountingPronouncementsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable":  {
                "auth_ref":  [
                    "r124",
                    "r126"
                    ],
                "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.stewart.com/role/GeneralRecentlyAdoptedAccountingPronouncementsDetails"
                    ],
                "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":  "Recently adopted accounting pronouncements and Recent significant accounting pronouncements not yet adopted"
                            }
                        }
                    },
                "localname":  "NewAccountingPronouncementsPolicyPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_NonUsMember":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Countries excluding the United States of America (US).",
                            "label":  "Non-US [Member]",
                            "netLabel":  "International"
                            }
                        }
                    },
                "localname":  "NonUsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/SegmentInformationRevenuesGeneratedInDomesticAndForeignCountryDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1":  {
                "auth_ref":  [
                    "r103",
                    "r104",
                    "r105"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The net book value of a nonmonetary asset transferred or exchanged in connection with the acquisition of a business or asset in a noncash transaction.  Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. \"Part noncash\" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.  Nonmonetary assets and liabilities are assets and liabilities that will not result in cash receipts or cash payments in the future.",
                            "label":  "Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)",
                            "totalLabel":  "Net cash paid for acquisition of subsidiaries and other assets"
                            }
                        }
                    },
                "localname":  "NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumed1",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumedAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) [Abstract]",
                            "terseLabel":  "Net changes in financial statement amounts due to purchase of subsidiaries and other assets:"
                            }
                        }
                    },
                "localname":  "NoncashOrPartNoncashAcquisitionNetNonmonetaryAssetsAcquiredLiabilitiesAssumedAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable":  {
                "auth_ref":  [
                    "r71"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of income (loss) attributable to other redeemable noncontrolling equity holder.",
                            "label":  "Noncontrolling Interest in Net Income (Loss) Other Noncontrolling Interests, Redeemable",
                            "negatedLabel":  "Net effect of changes in ownership and other"
                            }
                        }
                    },
                "localname":  "NoncontrollingInterestInNetIncomeLossOtherNoncontrollingInterestsRedeemable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_NoncontrollingInterestMember":  {
                "auth_ref":  [
                    "r330"
                    ],
                "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":  "Noncontrolling interests"
                            }
                        }
                    },
                "localname":  "NoncontrollingInterestMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock":  {
                "auth_ref":  [
                    "r275"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the changes in outstanding nonvested restricted stock shares.",
                            "label":  "Nonvested Restricted Stock Shares Activity [Table Text Block]",
                            "terseLabel":  "Summary of the restricted common stock award/unit activity"
                            }
                        }
                    },
                "localname":  "NonvestedRestrictedStockSharesActivityTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "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]",
                            "terseLabel":  "Notes Payable, Other Than Banks"
                            }
                        }
                    },
                "localname":  "NotesPayableOtherPayablesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_NotesReceivableGross":  {
                "auth_ref":  [
                    "r193"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_PremiumsAndOtherReceivablesNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, before allowance for credit loss, of financing receivable.",
                            "label":  "Financing Receivable, before Allowance for Credit Loss",
                            "terseLabel":  "Notes",
                            "verboseLabel":  "Notes - due from subsidiaries"
                            }
                        }
                    },
                "localname":  "NotesReceivableGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "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.stewart.com/role/SegmentInformationAdditionalInformationDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "us-gaap_NumberOfReportingUnits":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Number of reporting units tested for impairment of goodwill.  A reporting unit is an operating segment or one level below an operating segment.",
                            "label":  "Number of Reporting Units",
                            "terseLabel":  "Number of reporting units"
                            }
                        }
                    },
                "localname":  "NumberOfReportingUnits",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralGoodwillDetails"
                    ],
                "xbrltype":  "integerItemType"
                },
            "us-gaap_OperatingLeaseExpense":  {
                "auth_ref":  [
                    "r379"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of operating lease expense.  Excludes sublease income.",
                            "label":  "Operating Lease, Expense",
                            "terseLabel":  "Operating lease expense"
                            }
                        }
                    },
                "localname":  "OperatingLeaseExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Lessee, Operating Lease, Liability, Payment, Due [Abstract]",
                            "terseLabel":  "Operating"
                            }
                        }
                    },
                "localname":  "OperatingLeaseLiabilitiesPaymentsDueAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OperatingLeaseLiability":  {
                "auth_ref":  [
                    "r378"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_Liabilities",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails":  {
                        "order":  1.0,
                        "parentTag":  "stc_LeaseLiability",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetailsCalc2":  {
                        "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",
                            "netLabel":  "Net future minimum lease payments",
                            "terseLabel":  "Operating lease liabilities",
                            "verboseLabel":  "Operating lease liabilities"
                            }
                        }
                    },
                "localname":  "OperatingLeaseLiability",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails",
                    "http://www.stewart.com/role/LeasesFutureMinimumLeasePaymentsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeasePayments":  {
                "auth_ref":  [
                    "r381",
                    "r384"
                    ],
                "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 ($000)"
                            }
                        }
                    },
                "localname":  "OperatingLeasePayments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesOtherInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseRightOfUseAsset":  {
                "auth_ref":  [
                    "r377"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  12.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails":  {
                        "order":  1.0,
                        "parentTag":  "stc_LeaseRightOfUseAsset",
                        "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 assets",
                            "verboseLabel":  "Operating lease assets, net of accumulated amortization"
                            }
                        }
                    },
                "localname":  "OperatingLeaseRightOfUseAsset",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/GeneralRecentlyAdoptedAccountingPronouncementsDetails",
                    "http://www.stewart.com/role/LeasesClassificationOfLeasesDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent":  {
                "auth_ref":  [
                    "r387",
                    "r390"
                    ],
                "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.stewart.com/role/LeasesOtherInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "percentItemType"
                },
            "us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1":  {
                "auth_ref":  [
                    "r386",
                    "r390"
                    ],
                "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.stewart.com/role/LeasesOtherInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_OperatingLeasesFutureMinimumPaymentsDue":  {
                "auth_ref":  [
                    "r371",
                    "r373"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.",
                            "label":  "Operating Leases, Future Minimum Payments Due",
                            "totalLabel":  "Future minimum payments, total"
                            }
                        }
                    },
                "localname":  "OperatingLeasesFutureMinimumPaymentsDue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent":  {
                "auth_ref":  [
                    "r371",
                    "r373"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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":  "Operating Leases, Future Minimum Payments Due, Next Twelve Months",
                            "terseLabel":  "2019"
                            }
                        }
                    },
                "localname":  "OperatingLeasesFutureMinimumPaymentsDueCurrent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears":  {
                "auth_ref":  [
                    "r371",
                    "r373"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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":  "Operating Leases, Future Minimum Payments, Due in Five Years",
                            "terseLabel":  "2023"
                            }
                        }
                    },
                "localname":  "OperatingLeasesFutureMinimumPaymentsDueInFiveYears",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears":  {
                "auth_ref":  [
                    "r371",
                    "r373"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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":  "Operating Leases, Future Minimum Payments, Due in Four Years",
                            "terseLabel":  "2022"
                            }
                        }
                    },
                "localname":  "OperatingLeasesFutureMinimumPaymentsDueInFourYears",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears":  {
                "auth_ref":  [
                    "r371",
                    "r373"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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":  "Operating Leases, Future Minimum Payments, Due in Three Years",
                            "terseLabel":  "2021"
                            }
                        }
                    },
                "localname":  "OperatingLeasesFutureMinimumPaymentsDueInThreeYears",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears":  {
                "auth_ref":  [
                    "r371",
                    "r373"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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":  "Operating Leases, Future Minimum Payments, Due in Two Years",
                            "terseLabel":  "2020"
                            }
                        }
                    },
                "localname":  "OperatingLeasesFutureMinimumPaymentsDueInTwoYears",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter":  {
                "auth_ref":  [
                    "r371",
                    "r373"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_OperatingLeasesFutureMinimumPaymentsDue",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due 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":  "Operating Leases, Future Minimum Payments, Due Thereafter",
                            "terseLabel":  "2024 and after"
                            }
                        }
                    },
                "localname":  "OperatingLeasesFutureMinimumPaymentsDueThereafter",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesSummaryOfFutureMinimumLeasePaymentsOfOperatingLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OperatingLeasesRentExpenseNet":  {
                "auth_ref":  [
                    "r372"
                    ],
                "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":  "Operating lease expense"
                            }
                        }
                    },
                "localname":  "OperatingLeasesRentExpenseNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "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_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock":  {
                "auth_ref":  [
                    "r2",
                    "r349"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.",
                            "label":  "Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]",
                            "terseLabel":  "General"
                            }
                        }
                    },
                "localname":  "OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/General"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_OtherAssetImpairmentCharges":  {
                "auth_ref":  [
                    "r97",
                    "r229"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.",
                            "label":  "Other Asset Impairment Charges",
                            "terseLabel":  "Impairment expense of other intangible assets"
                            }
                        }
                    },
                "localname":  "OtherAssetImpairmentCharges",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherAssets":  {
                "auth_ref":  [
                    "r10",
                    "r405",
                    "r438"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "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.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax":  {
                "auth_ref":  [
                    "r49"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before tax and reclassification adjustments of other comprehensive income (loss).",
                            "label":  "Other Comprehensive Income (Loss), before Reclassifications, before Tax",
                            "terseLabel":  "Change in net unrealized gains and losses on investments"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax":  {
                "auth_ref":  [
                    "r49",
                    "r60"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetailsCalc2":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax, before reclassification adjustments of other comprehensive income (loss).",
                            "label":  "Other Comprehensive Income (Loss), before Reclassifications, Net of Tax",
                            "totalLabel":  "Change in net unrealized gains and losses on investments"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax":  {
                "auth_ref":  [
                    "r46",
                    "r320"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of tax expense (benefit) allocated to other comprehensive income (loss) before reclassification adjustment from accumulated other comprehensive income (loss).",
                            "label":  "Other Comprehensive Income (Loss) before Reclassifications, Tax",
                            "terseLabel":  "Change in net unrealized gains and losses on investments"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossBeforeReclassificationsTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossBeforeTax":  {
                "auth_ref":  [
                    "r183"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before tax, after reclassification adjustments of other comprehensive income (loss).",
                            "label":  "Other Comprehensive Income (Loss), before Tax",
                            "totalLabel":  "Other comprehensive income (loss)"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossBeforeTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Other Comprehensive Income (Loss), before Tax [Abstract]",
                            "terseLabel":  "Before-Tax Amount"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax":  {
                "auth_ref":  [
                    "r39",
                    "r364"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent",
                        "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",
                            "verboseLabel":  "Foreign currency translation (net of tax)"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity",
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossNetOfTax":  {
                "auth_ref":  [
                    "r54",
                    "r57",
                    "r60",
                    "r251"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetailsCalc2":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "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",
                            "totalLabel":  "Other comprehensive income (loss)"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Other Comprehensive Income (Loss), Net of Tax [Abstract]",
                            "terseLabel":  "Net-of-Tax Amount"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent":  {
                "auth_ref":  [
                    "r54",
                    "r57",
                    "r332",
                    "r333",
                    "r341"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of other comprehensive income (loss) attributable to parent entity.",
                            "label":  "Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent",
                            "totalLabel":  "Other comprehensive income (loss), net of taxes"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax":  {
                "auth_ref":  [
                    "r45",
                    "r50",
                    "r51",
                    "r177"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.",
                            "label":  "Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax",
                            "negatedLabel":  "Reclassification adjustment for change in unrealized gains and losses included in net income",
                            "negatedTerseLabel":  "Net realized gain reclassification (net of tax)"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity",
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossTax":  {
                "auth_ref":  [
                    "r46",
                    "r320",
                    "r322"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of tax expense (benefit) allocated to other comprehensive income (loss).",
                            "label":  "Other Comprehensive Income (Loss), Tax",
                            "totalLabel":  "Other comprehensive income (loss)"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherComprehensiveIncomeLossTaxAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Other Comprehensive Income (Loss), Tax [Abstract]",
                            "terseLabel":  "Tax Expense (Benefit)"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeLossTaxAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax":  {
                "auth_ref":  [
                    "r41",
                    "r45"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.",
                            "label":  "Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax",
                            "terseLabel":  "Change in net unrealized gains and losses on investments",
                            "verboseLabel":  "Net change in unrealized gains and losses on investments (net of tax)"
                            }
                        }
                    },
                "localname":  "OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity",
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherCostAndExpenseOperating":  {
                "auth_ref":  [
                    "r72"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_BenefitsLossesAndExpenses",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.",
                            "label":  "Other Cost and Expense, Operating",
                            "terseLabel":  "Other operating expenses",
                            "verboseLabel":  "Other operating expenses, including $276 each year to affiliates"
                            }
                        }
                    },
                "localname":  "OtherCostAndExpenseOperating",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherIncome":  {
                "auth_ref":  [
                    "r458"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_Revenues",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of revenue and income classified as other.",
                            "label":  "Other Income",
                            "terseLabel":  "Other income"
                            }
                        }
                    },
                "localname":  "OtherIncome",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherLoansPayable":  {
                "auth_ref":  [
                    "r13",
                    "r409",
                    "r441"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/NotesPayableSummaryOfNotesPayableDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_LongTermDebt",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of long-term loans payable classified as other.",
                            "label":  "Other Loans Payable",
                            "terseLabel":  "Other notes payable"
                            }
                        }
                    },
                "localname":  "OtherLoansPayable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableSummaryOfNotesPayableDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherNoncashIncomeExpense":  {
                "auth_ref":  [
                    "r98"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  13.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other.",
                            "label":  "Other Noncash Income (Expense)",
                            "negatedLabel":  "Other \u2013 net"
                            }
                        }
                    },
                "localname":  "OtherNoncashIncomeExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherNonoperatingGainsLosses":  {
                "auth_ref":  [
                    "r73"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_Revenues",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of gain (loss) related to nonoperating activities, classified as other.",
                            "label":  "Other Nonoperating Gains (Losses)",
                            "terseLabel":  "Net realized and unrealized gains",
                            "totalLabel":  "Investment and other gains (losses) \u2013 net"
                            }
                        }
                    },
                "localname":  "OtherNonoperatingGainsLosses",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_OtherReceivables":  {
                "auth_ref":  [
                    "r38"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount due from parties in nontrade transactions, classified as other.",
                            "label":  "Other Receivables",
                            "verboseLabel":  "Receivables from affiliates"
                            }
                        }
                    },
                "localname":  "OtherReceivables",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsForLossesAndLossAdjustmentExpense":  {
                "auth_ref":  [
                    "r94",
                    "r464"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process.",
                            "label":  "Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid",
                            "negatedTotalLabel":  "Total payments, net of recoveries"
                            }
                        }
                    },
                "localname":  "PaymentsForLossesAndLossAdjustmentExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsForProceedsFromShortTermInvestments":  {
                "auth_ref":  [
                    "r76",
                    "r79",
                    "r100"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The net amount paid (received) by the reporting entity through acquisition or sale and maturities of short-term investments with an original maturity that is three months or less which qualify for treatment as an investing activity based on management's intention and intended by management to be liquidated, if necessary, within the current operating cycle.  Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.",
                            "label":  "Payments for (Proceeds from) Short-term Investments",
                            "negatedTerseLabel":  "Net (purchases) sales of short-term investments"
                            }
                        }
                    },
                "localname":  "PaymentsForProceedsFromShortTermInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsForRepurchaseOfCommonStock":  {
                "auth_ref":  [
                    "r85"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflow to reacquire common stock during the period.",
                            "label":  "Payments for Repurchase of Common Stock",
                            "negatedTerseLabel":  "Repurchases of Common Stock"
                            }
                        }
                    },
                "localname":  "PaymentsForRepurchaseOfCommonStock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsOfDistributionsToAffiliates":  {
                "auth_ref":  [
                    "r85"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The distributions of earnings to an entity that is affiliated with the reporting entity by means of direct or indirect ownership.",
                            "label":  "Payments of Distributions to Affiliates",
                            "negatedLabel":  "Distributions to noncontrolling interests"
                            }
                        }
                    },
                "localname":  "PaymentsOfDistributionsToAffiliates",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsOfDividendsCommonStock":  {
                "auth_ref":  [
                    "r85"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.",
                            "label":  "Payments of Ordinary Dividends, Common Stock",
                            "negatedLabel":  "Cash dividends paid",
                            "negatedTerseLabel":  "Dividends paid"
                            }
                        }
                    },
                "localname":  "PaymentsOfDividendsCommonStock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsToAcquireAvailableForSaleSecurities":  {
                "auth_ref":  [
                    "r80",
                    "r161"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  10.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.",
                            "label":  "Payments to Acquire Available-for-sale Securities",
                            "negatedLabel":  "Purchases of investments in securities"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquireAvailableForSaleSecurities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt":  {
                "auth_ref":  [
                    "r75",
                    "r79",
                    "r161"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
                            "label":  "Payments to Acquire Debt Securities, Available-for-sale",
                            "negatedLabel":  "Purchases of investments in securities"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquireAvailableForSaleSecuritiesDebt",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired":  {
                "auth_ref":  [
                    "r81"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.",
                            "label":  "Payments to Acquire Businesses, Net of Cash Acquired",
                            "negatedLabel":  "Net cash paid for acquisition of subsidiaries and other assets"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquireBusinessesNetOfCashAcquired",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsToAcquireInterestInSubsidiariesAndAffiliates":  {
                "auth_ref":  [
                    "r81"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).",
                            "label":  "Payments to Acquire Interest in Subsidiaries and Affiliates",
                            "negatedTerseLabel":  "Contributions to a subsidiary"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquireInterestInSubsidiariesAndAffiliates",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsToAcquireProductiveAssets":  {
                "auth_ref":  [
                    "r82"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.",
                            "label":  "Payments to Acquire Productive Assets",
                            "negatedLabel":  "Purchases of property and equipment, title plants and real estate"
                            }
                        }
                    },
                "localname":  "PaymentsToAcquireProductiveAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PaymentsToMinorityShareholders":  {
                "auth_ref":  [
                    "r87"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash outflow to a noncontrolling interest.  Includes, but not limited to, reduction of noncontrolling interest ownership.  Excludes dividends paid to the noncontrolling interest.",
                            "label":  "Payments to Noncontrolling Interests",
                            "negatedLabel":  "Purchase of remaining interest of consolidated subsidiaries",
                            "negatedTerseLabel":  "Purchase of remaining interest of consolidated subsidiary"
                            }
                        }
                    },
                "localname":  "PaymentsToMinorityShareholders",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "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-Based Shares"
                            }
                        }
                    },
                "localname":  "PerformanceSharesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_PolicyholderBenefitsAndClaimsIncurredNet":  {
                "auth_ref":  [
                    "r432",
                    "r459"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_BenefitsLossesAndExpenses",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.",
                            "label":  "Policyholder Benefits and Claims Incurred, Net",
                            "terseLabel":  "Title losses and related claims",
                            "totalLabel":  "Total provisions"
                            }
                        }
                    },
                "localname":  "PolicyholderBenefitsAndClaimsIncurredNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PremiumsAndOtherReceivablesNet":  {
                "auth_ref":  [
                    "r451"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  8.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Carrying amount as of the balance sheet date, net of allowance for doubtful accounts, of all premiums and other types of receivables due from other persons or entities.",
                            "label":  "Premiums and Other Receivables, Net",
                            "totalLabel":  "Total receivables"
                            }
                        }
                    },
                "localname":  "PremiumsAndOtherReceivablesNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PremiumsAndOtherReceivablesNetAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Premiums and Other Receivables, Net [Abstract]",
                            "terseLabel":  "Receivables:"
                            }
                        }
                    },
                "localname":  "PremiumsAndOtherReceivablesNetAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_PremiumsReceivableGross":  {
                "auth_ref":  [
                    "r451"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  4.0,
                        "parentTag":  "us-gaap_PremiumsAndOtherReceivablesNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Gross amount, as of the balance sheet date, due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, before deducting the allowance for doubtful accounts.",
                            "label":  "Premiums Receivable, Gross",
                            "terseLabel":  "Premiums from agencies"
                            }
                        }
                    },
                "localname":  "PremiumsReceivableGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromCollectionOfNotesReceivable":  {
                "auth_ref":  [
                    "r76"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.",
                            "label":  "Proceeds from Collection of Notes Receivable",
                            "verboseLabel":  "Collections on notes receivables"
                            }
                        }
                    },
                "localname":  "ProceedsFromCollectionOfNotesReceivable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromDividendsReceived":  {
                "auth_ref":  [
                    "r88"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Dividends received on equity and other investments during the current period.",
                            "label":  "Proceeds from Dividends Received",
                            "terseLabel":  "Dividends from subsidiary"
                            }
                        }
                    },
                "localname":  "ProceedsFromDividendsReceived",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities":  {
                "auth_ref":  [
                    "r75",
                    "r76",
                    "r161"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  5.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
                            "label":  "Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale",
                            "terseLabel":  "Proceeds from matured investments in debt securities"
                            }
                        }
                    },
                "localname":  "ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromNotesPayable":  {
                "auth_ref":  [
                    "r83"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash inflow from a borrowing supported by a written promise to pay an obligation.",
                            "label":  "Proceeds from Notes Payable",
                            "terseLabel":  "Proceeds from notes payable"
                            }
                        }
                    },
                "localname":  "ProceedsFromNotesPayable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromPaymentsForOtherFinancingActivities":  {
                "auth_ref":  [
                    "r84",
                    "r87",
                    "r118"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  6.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow (outflow) from financing activities classified as other.",
                            "label":  "Proceeds from (Payments for) Other Financing Activities",
                            "terseLabel":  "Other - net",
                            "verboseLabel":  "Other \u2013 net"
                            }
                        }
                    },
                "localname":  "ProceedsFromPaymentsForOtherFinancingActivities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities":  {
                "auth_ref":  [
                    "r77",
                    "r161"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  9.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.",
                            "label":  "Proceeds from Sale of Available-for-sale Securities",
                            "terseLabel":  "Proceeds from sales of investments in securities",
                            "verboseLabel":  "Total proceeds from sales of investments in securities"
                            }
                        }
                    },
                "localname":  "ProceedsFromSaleOfAvailableForSaleSecurities",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsProceedsFromSaleOfInvestmentDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt":  {
                "auth_ref":  [
                    "r75",
                    "r76",
                    "r161"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  8.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).",
                            "label":  "Proceeds from Sale of Debt Securities, Available-for-sale",
                            "terseLabel":  "Total proceeds from sales of investments in securities",
                            "verboseLabel":  "Proceeds from sales of investments in securities"
                            }
                        }
                    },
                "localname":  "ProceedsFromSaleOfAvailableForSaleSecuritiesDebt",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsProceedsFromSaleOfInvestmentDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProceedsFromSaleOfProductiveAssets":  {
                "auth_ref":  [
                    "r78"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInInvestingActivities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.",
                            "label":  "Proceeds from Sale of Productive Assets",
                            "terseLabel":  "Proceeds from the sale of land, buildings, property and equipment, and real estate"
                            }
                        }
                    },
                "localname":  "ProceedsFromSaleOfProductiveAssets",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ProductAndServiceOtherMember":  {
                "auth_ref":  [
                    "r261"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Article or substance produced by nature, labor or machinery and act of providing assistance, classified as other.",
                            "label":  "Product and Service, Other [Member]",
                            "terseLabel":  "Other revenues"
                            }
                        }
                    },
                "localname":  "ProductAndServiceOtherMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/RevenuesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ProfitLoss":  {
                "auth_ref":  [
                    "r53",
                    "r56",
                    "r90",
                    "r147",
                    "r152",
                    "r332",
                    "r338",
                    "r340",
                    "r344",
                    "r345"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "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 income",
                            "totalLabel":  "Net income",
                            "verboseLabel":  "Net income"
                            }
                        }
                    },
                "localname":  "ProfitLoss",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentByTypeAxis":  {
                "auth_ref":  [
                    "r28",
                    "r228"
                    ],
                "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.stewart.com/role/GeneralPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "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, Plant and Equipment [Line Items]"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentNet":  {
                "auth_ref":  [
                    "r8",
                    "r9",
                    "r228",
                    "r447"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  7.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "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",
                            "totalLabel":  "Total property and equipment, at cost"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentNet",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentNetAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Property, Plant and Equipment, Net [Abstract]",
                            "terseLabel":  "Property and equipment, at cost:",
                            "verboseLabel":  "Property and equipment, at cost:"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentNetAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentPolicyTextBlock":  {
                "auth_ref":  [
                    "r26",
                    "r107",
                    "r228"
                    ],
                "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.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_PropertyPlantAndEquipmentTypeDomain":  {
                "auth_ref":  [
                    "r8",
                    "r226"
                    ],
                "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.stewart.com/role/GeneralPropertyAndEquipmentDetails"
                    ],
                "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":  "Property and equipment, useful life (years)"
                            }
                        }
                    },
                "localname":  "PropertyPlantAndEquipmentUsefulLife",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_ProvisionForDoubtfulAccounts":  {
                "auth_ref":  [
                    "r69",
                    "r189"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  3.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "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":  "Provision for bad debt"
                            }
                        }
                    },
                "localname":  "ProvisionForDoubtfulAccounts",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_QuarterlyFinancialInformationDisclosureAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Quarterly Financial Information Disclosure [Abstract]"
                            }
                        }
                    },
                "localname":  "QuarterlyFinancialInformationDisclosureAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "xbrltype":  "stringItemType"
                },
            "us-gaap_QuarterlyFinancialInformationTextBlock":  {
                "auth_ref":  [
                    "r140"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for quarterly financial data.  Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information.",
                            "label":  "Quarterly Financial Information [Text Block]",
                            "terseLabel":  "Quarterly financial information (unaudited)"
                            }
                        }
                    },
                "localname":  "QuarterlyFinancialInformationTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/QuarterlyFinancialInformationUnaudited"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax":  {
                "auth_ref":  [
                    "r49",
                    "r52"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before tax of reclassification adjustments of other comprehensive income (loss).",
                            "label":  "Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax",
                            "negatedTerseLabel":  "Reclassification adjustment for change in unrealized gains and losses included in net income"
                            }
                        }
                    },
                "localname":  "ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax":  {
                "auth_ref":  [
                    "r49",
                    "r52",
                    "r60"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        },
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetailsCalc2":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_OtherComprehensiveIncomeLossNetOfTax",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount after tax of reclassification adjustments of other comprehensive income (loss).",
                            "label":  "Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax",
                            "negatedTotalLabel":  "Reclassification adjustment for change in unrealized gains and losses included in net income"
                            }
                        }
                    },
                "localname":  "ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ReclassificationFromAociCurrentPeriodTax":  {
                "auth_ref":  [
                    "r46",
                    "r51",
                    "r320"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_OtherComprehensiveIncomeLossTax",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss).",
                            "label":  "Reclassification from AOCI, Current Period, Tax",
                            "negatedTerseLabel":  "Reclassification adjustment for change in unrealized gains and losses included in net income"
                            }
                        }
                    },
                "localname":  "ReclassificationFromAociCurrentPeriodTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ReinsurancePayable":  {
                "auth_ref":  [
                    "r449"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The carrying amount as of the balance sheet date of the known and estimated amounts owed to insurers under reinsurance treaties or other arrangements.",
                            "label":  "Reinsurance Payable",
                            "terseLabel":  "Reinsurance payable"
                            }
                        }
                    },
                "localname":  "ReinsurancePayable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ReinsuranceDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ReinsuranceRecoverablesGross":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount before valuation allowance recoverable under reinsurance contracts.  Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.",
                            "label":  "Reinsurance Recoverables, Gross",
                            "terseLabel":  "Reinsurance recoverables"
                            }
                        }
                    },
                "localname":  "ReinsuranceRecoverablesGross",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ReinsuranceDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ReinsuranceTextBlock":  {
                "auth_ref":  [
                    "r475"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure pertaining to the existence, magnitude and information about insurance that has been ceded to or assumed from another insurance company, including the methodologies and assumptions used in determining recorded amounts.",
                            "label":  "Reinsurance [Text Block]",
                            "terseLabel":  "Reinsurance"
                            }
                        }
                    },
                "localname":  "ReinsuranceTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/Reinsurance"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_RepaymentsOfNotesPayable":  {
                "auth_ref":  [
                    "r86"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInFinancingActivities",
                        "weight":  -1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The cash outflow for a borrowing supported by a written promise to pay an obligation.",
                            "label":  "Repayments of Notes Payable",
                            "negatedLabel":  "Payments on notes payable",
                            "negatedTerseLabel":  "Payments on notes payable"
                            }
                        }
                    },
                "localname":  "RepaymentsOfNotesPayable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RestrictedCashAndCashEquivalents":  {
                "auth_ref":  [
                    "r6",
                    "r99",
                    "r106",
                    "r404",
                    "r442"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of cash and cash equivalents restricted as to withdrawal or usage.  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",
                            "terseLabel":  "Restricted cash and cash equivalent"
                            }
                        }
                    },
                "localname":  "RestrictedCashAndCashEquivalents",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/RestrictionsOnCashAndInvestmentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RestrictedInvestments":  {
                "auth_ref":  [
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "stc_InvestmentsInDebtAndEquitySecurities",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements.  For use in an unclassified balance sheet.",
                            "label":  "Restricted Investments",
                            "terseLabel":  "Statutory reserve funds"
                            }
                        }
                    },
                "localname":  "RestrictedInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/RestrictionsOnCashAndInvestmentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RestrictedStockMember":  {
                "auth_ref":  [
                    "r135"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Stock including a provision that prohibits sale or substantive sale of an equity instrument for a specified period of time or until specified performance conditions are met.",
                            "label":  "Restricted Stock [Member]",
                            "terseLabel":  "Restricted Stock [Member]",
                            "verboseLabel":  "Restricted Stock Awards"
                            }
                        }
                    },
                "localname":  "RestrictedStockMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "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":  "Restricted Stock Unit"
                            }
                        }
                    },
                "localname":  "RestrictedStockUnitsRSUMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_RestrictionsOnDividendsLoansAndAdvancesTextBlock":  {
                "auth_ref":  [
                    "r113"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The entire disclosure for a banking or savings institution's compliance during the year with (a) federal and state laws and regulations relative to dividend restrictions and (b) federal laws and regulations relative to insider loans.",
                            "label":  "Restrictions on Dividends, Loans and Advances [Text Block]",
                            "terseLabel":  "Statutory surplus and dividend restrictions"
                            }
                        }
                    },
                "localname":  "RestrictionsOnDividendsLoansAndAdvancesTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictions"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_RetainedEarningsAccumulatedDeficit":  {
                "auth_ref":  [
                    "r19",
                    "r256",
                    "r443"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails":  {
                        "order":  3.0,
                        "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)",
                            "periodEndLabel":  "Retained earnings at end of year",
                            "periodStartLabel":  "Retained earnings at beginning of year",
                            "terseLabel":  "Retained earnings"
                            }
                        }
                    },
                "localname":  "RetainedEarningsAccumulatedDeficit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "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",
                            "verboseLabel":  "Retained Earnings"
                            }
                        }
                    },
                "localname":  "RetainedEarningsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity",
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "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_RevenueFromContractWithCustomerExcludingAssessedTax":  {
                "auth_ref":  [
                    "r259",
                    "r260"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_Revenues",
                        "weight":  1.0
                        }
                    },
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, excluding 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, Excluding Assessed Tax",
                            "terseLabel":  "Operating revenues"
                            }
                        }
                    },
                "localname":  "RevenueFromContractWithCustomerExcludingAssessedTax",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/RevenuesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RevenueFromContractWithCustomerPolicyTextBlock":  {
                "auth_ref":  [
                    "r108",
                    "r263"
                    ],
                "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":  "Revenues"
                            }
                        }
                    },
                "localname":  "RevenueFromContractWithCustomerPolicyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralPolicies"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_RevenueFromContractWithCustomerTextBlock":  {
                "auth_ref":  [
                    "r263"
                    ],
                "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":  "Revenues"
                            }
                        }
                    },
                "localname":  "RevenueFromContractWithCustomerTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/Revenues"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_RevenueFromExternalCustomersByGeographicAreasTableTextBlock":  {
                "auth_ref":  [
                    "r154"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of revenue from external customers by geographic areas attributed to the entity's country of domicile and to foreign countries from which the entity derives revenue.",
                            "label":  "Revenue from External Customers by Geographic Areas [Table Text Block]",
                            "terseLabel":  "Revenues generated in domestic and all international operations"
                            }
                        }
                    },
                "localname":  "RevenueFromExternalCustomersByGeographicAreasTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/SegmentInformationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_Revenues":  {
                "auth_ref":  [
                    "r64",
                    "r142",
                    "r143",
                    "r151"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "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":  "Revenues",
                            "totalLabel":  "Revenues",
                            "verboseLabel":  "Net revenue"
                            }
                        }
                    },
                "localname":  "Revenues",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/QuarterlyFinancialInformationUnauditedDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails",
                    "http://www.stewart.com/role/SegmentInformationRevenuesGeneratedInDomesticAndForeignCountryDetails",
                    "http://www.stewart.com/role/SegmentInformationSelectedStatementOfOperationsAndIncomeLossInformationRelatedToSegmentsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RevenuesAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Revenues [Abstract]",
                            "terseLabel":  "Revenues"
                            }
                        }
                    },
                "localname":  "RevenuesAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfIncomeAndRetainedEarningsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "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.stewart.com/role/SegmentInformationRevenuesGeneratedInDomesticAndForeignCountryDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability":  {
                "auth_ref":  [
                    "r385",
                    "r390"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase in right-of-use asset obtained in exchange for finance lease liability.",
                            "label":  "Right-of-Use Asset Obtained in Exchange for Finance Lease Liability",
                            "terseLabel":  "Lease assets obtained in exchange for lease obligations ($000)"
                            }
                        }
                    },
                "localname":  "RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesOtherInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability":  {
                "auth_ref":  [
                    "r385",
                    "r390"
                    ],
                "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":  "Lease assets obtained in exchange for lease obligations ($000)"
                            }
                        }
                    },
                "localname":  "RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesOtherInformationRelatedToLeasesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable":  {
                "auth_ref":  [
                    "r212"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the major classes of acquired finite-lived intangible assets showing the amount, any significant residual value, weighted average amortization period, and other characteristics.  A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company.",
                            "label":  "Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table]",
                            "terseLabel":  "Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfAcquiredFiniteLivedIntangibleAssetByMajorClassTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock":  {
                "auth_ref":  [
                    "r266"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost.",
                            "label":  "Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]",
                            "terseLabel":  "Schedule of changes in other comprehensive income (loss)"
                            }
                        }
                    },
                "localname":  "ScheduleOfAmountsRecognizedInOtherComprehensiveIncomeLossTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems":  {
                "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 Securities, Available-for-sale [Line Items]",
                            "terseLabel":  "Debt Securities, Available-for-sale [Line Items]"
                            }
                        }
                    },
                "localname":  "ScheduleOfAvailableForSaleSecuritiesLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GeneralInvestmentsInDebtAndEquitySecuritiesDetails",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsProceedsFromSaleOfInvestmentDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAmortizedCostsAndFairValuesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedGainsAndLossesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock":  {
                "auth_ref":  [
                    "r316"
                    ],
                "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]",
                            "terseLabel":  "Income tax expense"
                            }
                        }
                    },
                "localname":  "ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfDebtTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation.",
                            "label":  "Schedule of Debt [Table Text Block]",
                            "terseLabel":  "Summary of notes payable"
                            }
                        }
                    },
                "localname":  "ScheduleOfDebtTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock":  {
                "auth_ref":  [
                    "r308"
                    ],
                "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 deferred tax assets and liabilities"
                            }
                        }
                    },
                "localname":  "ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock":  {
                "auth_ref":  [
                    "r136"
                    ],
                "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":  "Basic and diluted earnings (loss) per share"
                            }
                        }
                    },
                "localname":  "ScheduleOfEarningsPerShareBasicAndDilutedTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EarningsPerShareTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock":  {
                "auth_ref":  [
                    "r297"
                    ],
                "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":  "Reconciliation of income tax expense (benefit) at federal statutory rate"
                            }
                        }
                    },
                "localname":  "ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable":  {
                "auth_ref":  [
                    "r212",
                    "r216"
                    ],
                "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.stewart.com/role/GeneralOtherIntangiblesDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock":  {
                "auth_ref":  [
                    "r374"
                    ],
                "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":  "Future minimum lease payments"
                            }
                        }
                    },
                "localname":  "ScheduleOfFutureMinimumRentalPaymentsForOperatingLeasesTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems":  {
                "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":  "Gain (Loss) on Securities [Line Items]",
                            "terseLabel":  "Gain (Loss) on Securities [Line Items]"
                            }
                        }
                    },
                "localname":  "ScheduleOfGainLossOnInvestmentsIncludingMarketableSecuritiesAndInvestmentsHeldAtCostIncomeStatementReportedAmountsSummaryLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfGainLossOnInvestmentsTable":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Disclosure of information about realized and unrealized gain (loss) on investment in security.",
                            "label":  "Schedule of Gain (Loss) on Securities [Table]",
                            "terseLabel":  "Schedule of Gain (Loss) on Securities [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfGainLossOnInvestmentsTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfGoodwillTable":  {
                "auth_ref":  [
                    "r208",
                    "r209"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Schedule of goodwill and the changes during the year due to acquisition, sale, impairment or for other reasons.",
                            "label":  "Schedule of Goodwill [Table]",
                            "terseLabel":  "Schedule of Goodwill [Table]"
                            }
                        }
                    },
                "localname":  "ScheduleOfGoodwillTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesSummaryOfGoodwillDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfGoodwillTextBlock":  {
                "auth_ref":  [
                    "r208",
                    "r209"
                    ],
                "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 goodwill"
                            }
                        }
                    },
                "localname":  "ScheduleOfGoodwillTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfLossContingenciesByContingencyTextBlock":  {
                "auth_ref":  [
                    "r236",
                    "r237",
                    "r238",
                    "r239",
                    "r240",
                    "r241",
                    "r242",
                    "r244",
                    "r245"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the loss contingencies that were reported in the period or disclosed as of the balance sheet date.",
                            "label":  "Schedule of Loss Contingencies by Contingency [Table Text Block]",
                            "terseLabel":  "Summary of estimated title losses"
                            }
                        }
                    },
                "localname":  "ScheduleOfLossContingenciesByContingencyTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfPropertyPlantAndEquipmentTable":  {
                "auth_ref":  [
                    "r28",
                    "r228"
                    ],
                "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.stewart.com/role/GeneralPropertyAndEquipmentDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock":  {
                "auth_ref":  [
                    "r139"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of quarterly financial data.  Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data.",
                            "label":  "Quarterly Financial Information [Table Text Block]",
                            "terseLabel":  "Summary of quarterly financial information"
                            }
                        }
                    },
                "localname":  "ScheduleOfQuarterlyFinancialInformationTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/QuarterlyFinancialInformationUnauditedTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfRealizedGainLossTableTextBlock":  {
                "auth_ref":  [
                    "r176"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales.",
                            "label":  "Schedule of Realized Gain (Loss) [Table Text Block]",
                            "terseLabel":  "Income from investments and net realized and unrealized gains"
                            }
                        }
                    },
                "localname":  "ScheduleOfRealizedGainLossTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable":  {
                "auth_ref":  [
                    "r62",
                    "r64",
                    "r155"
                    ],
                "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.stewart.com/role/SegmentInformationRevenuesGeneratedInDomesticAndForeignCountryDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable":  {
                "auth_ref":  [
                    "r141",
                    "r147",
                    "r149",
                    "r150",
                    "r208"
                    ],
                "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.stewart.com/role/SegmentInformationSelectedStatementOfOperationsAndIncomeLossInformationRelatedToSegmentsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock":  {
                "auth_ref":  [
                    "r141",
                    "r147",
                    "r149",
                    "r150",
                    "r208"
                    ],
                "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":  "Selected statement of operations and income (loss) information related to segments"
                            }
                        }
                    },
                "localname":  "ScheduleOfSegmentReportingInformationBySegmentTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/SegmentInformationTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable":  {
                "auth_ref":  [
                    "r272",
                    "r284"
                    ],
                "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.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ScheduleOfTemporaryImpairmentLossesInvestmentsTableTextBlock":  {
                "auth_ref":  [
                    "r174"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of investments in an unrealized loss position for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), including: (a) the aggregate related fair value of investments with unrealized losses, (b) the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).",
                            "label":  "Schedule of Temporary Impairment Losses, Investments [Table Text Block]",
                            "terseLabel":  "Gross unrealized losses on investments and fair values of related securities"
                            }
                        }
                    },
                "localname":  "ScheduleOfTemporaryImpairmentLossesInvestmentsTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "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.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails",
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesSummaryOfGoodwillDetails",
                    "http://www.stewart.com/role/SegmentInformationSelectedStatementOfOperationsAndIncomeLossInformationRelatedToSegmentsDetails"
                    ],
                "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":  [
                    "r156"
                    ],
                "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 information"
                            }
                        }
                    },
                "localname":  "SegmentReportingDisclosureTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/SegmentInformation"
                    ],
                "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.stewart.com/role/SegmentInformationSelectedStatementOfOperationsAndIncomeLossInformationRelatedToSegmentsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensation":  {
                "auth_ref":  [
                    "r96"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows":  {
                        "order":  14.0,
                        "parentTag":  "us-gaap_NetCashProvidedByUsedInOperatingActivities",
                        "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":  "Stock-based compensation expense"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensation",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1":  {
                "auth_ref":  [
                    "r273"
                    ],
                "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.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "xbrltype":  "durationItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod":  {
                "auth_ref":  [
                    "r276"
                    ],
                "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.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue":  {
                "auth_ref":  [
                    "r280"
                    ],
                "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 usd per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod":  {
                "auth_ref":  [
                    "r278"
                    ],
                "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":  "Share-based incentives, shares issued",
                            "verboseLabel":  "Granted (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue":  {
                "auth_ref":  [
                    "r278"
                    ],
                "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":  "Average grant price (in usd per share)",
                            "verboseLabel":  "Granted (in usd per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber":  {
                "auth_ref":  [
                    "r277"
                    ],
                "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":  "Nonvested balance at end of period (in shares)",
                            "periodStartLabel":  "Nonvested balance at beginning of period (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "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":  "Shares"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue":  {
                "auth_ref":  [
                    "r277"
                    ],
                "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":  "Nonvested balance at end of period (in usd per share)",
                            "periodStartLabel":  "Nonvested balance at beginning of period (in usd per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "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":  "Weighted-Average Grant-Date Fair Value per Share ($)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod":  {
                "auth_ref":  [
                    "r279"
                    ],
                "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",
                            "negatedLabel":  "Vested (in shares)",
                            "terseLabel":  "Shares granted in relation to the annual director retainer compensation (in shares)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue":  {
                "auth_ref":  [
                    "r281"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.",
                            "label":  "Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value",
                            "terseLabel":  "Fair value of vested shares"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue":  {
                "auth_ref":  [
                    "r279"
                    ],
                "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 usd per share)"
                            }
                        }
                    },
                "localname":  "ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "perShareItemType"
                },
            "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.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain":  {
                "auth_ref":  [
                    "r270",
                    "r274"
                    ],
                "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.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails",
                    "http://www.stewart.com/role/ShareBasedPaymentsSummaryOfRestrictedCommonStockAwardUnitActivityDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested":  {
                "auth_ref":  [
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Intrinsic 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, Aggregate Intrinsic Value, Nonvested",
                            "terseLabel":  "Aggregate fair values at grant date"
                            }
                        }
                    },
                "localname":  "SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueNonvested",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ShareBasedPaymentsAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ShortTermBorrowings":  {
                "auth_ref":  [
                    "r11",
                    "r407",
                    "r440"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.",
                            "label":  "Short-term Debt",
                            "terseLabel":  "Outstanding balances of short-term loan agreements"
                            }
                        }
                    },
                "localname":  "ShortTermBorrowings",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ShortTermDebtTypeAxis":  {
                "auth_ref":  [
                    "r31"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by type of short-term debt arrangement.",
                            "label":  "Short-term Debt, Type [Axis]",
                            "terseLabel":  "Short-term Debt, Type [Axis]"
                            }
                        }
                    },
                "localname":  "ShortTermDebtTypeAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_ShortTermDebtTypeDomain":  {
                "auth_ref":  [
                    "r29"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Type of short-term debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing.",
                            "label":  "Short-term Debt, Type [Domain]",
                            "terseLabel":  "Short-term Debt, Type [Domain]"
                            }
                        }
                    },
                "localname":  "ShortTermDebtTypeDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ShortTermInvestments":  {
                "auth_ref":  [
                    "r12",
                    "r412",
                    "r413",
                    "r415",
                    "r437"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  10.0,
                        "parentTag":  "us-gaap_Assets",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.",
                            "label":  "Short-term Investments",
                            "terseLabel":  "Short-term investments"
                            }
                        }
                    },
                "localname":  "ShortTermInvestments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ShortTermInvestmentsMember":  {
                "auth_ref":  [
                    "r479"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Investments which are not otherwise included in another category or item that the entity has the intent to sell or dispose of within one year from the date of the balance sheet.",
                            "label":  "Short-term Investments [Member]",
                            "terseLabel":  "Short-term investments, cash equivalents and other"
                            }
                        }
                    },
                "localname":  "ShortTermInvestmentsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsIncomeFromInvestmentsAndNetRealizedAndUnrealizedGainsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ShortTermLeaseCost":  {
                "auth_ref":  [
                    "r383",
                    "r390"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of short-term lease cost, excluding expense for lease with term of one month or less.",
                            "label":  "Short-term Lease, Cost",
                            "terseLabel":  "Short-term lease expense"
                            }
                        }
                    },
                "localname":  "ShortTermLeaseCost",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/LeasesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "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.stewart.com/role/IncomeTaxesAdditionalInformationDetails",
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_StatementBusinessSegmentsAxis":  {
                "auth_ref":  [
                    "r0",
                    "r147",
                    "r208",
                    "r230",
                    "r233",
                    "r234",
                    "r466"
                    ],
                "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.stewart.com/role/GoodwillAndOtherIntangiblesAdditionalInformationDetails",
                    "http://www.stewart.com/role/GoodwillAndOtherIntangiblesSummaryOfGoodwillDetails",
                    "http://www.stewart.com/role/SegmentInformationSelectedStatementOfOperationsAndIncomeLossInformationRelatedToSegmentsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatementEquityComponentsAxis":  {
                "auth_ref":  [
                    "r36",
                    "r251"
                    ],
                "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.stewart.com/role/ConsolidatedStatementsOfEquity",
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails",
                    "http://www.stewart.com/role/OtherComprehensiveIncomeLossDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "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.stewart.com/role/ConsolidatedBalanceSheetsParenthetical",
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity",
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "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_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.stewart.com/role/ConsolidatedBalanceSheetsParenthetical",
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity",
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatutoryAccountingPracticesByJurisdictionAxis":  {
                "auth_ref":  [
                    "r471",
                    "r472",
                    "r473"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Information by jurisdiction.",
                            "label":  "Jurisdiction [Axis]",
                            "terseLabel":  "Jurisdiction [Axis]"
                            }
                        }
                    },
                "localname":  "StatutoryAccountingPracticesByJurisdictionAxis",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_StatutoryAccountingPracticesJurisdictionDomain":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The state or country of domicile in which statutory financial statements are required.  Insurance holding companies generally are required to file reports in jurisdictions in which subsidiaries with significant underwritings are domiciled.",
                            "label":  "Statutory Accounting Practices, Jurisdiction [Domain]",
                            "terseLabel":  "Statutory Accounting Practices, Jurisdiction [Domain]"
                            }
                        }
                    },
                "localname":  "StatutoryAccountingPracticesJurisdictionDomain",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments":  {
                "auth_ref":  [
                    "r113"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of dividends available for payment after computation of statutory restrictions on capital surplus.",
                            "label":  "Statutory Accounting Practices, Statutory Amount Available for Dividend Payments",
                            "terseLabel":  "Maximum amount of dividend to be paid"
                            }
                        }
                    },
                "localname":  "StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance":  {
                "auth_ref":  [
                    "r444",
                    "r469"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of statutory capital and surplus (stockholders' equity) as of the balance sheet date using prescribed or permitted statutory accounting practices (rather than GAAP, if different) of the state or country.",
                            "label":  "Statutory Accounting Practices, Statutory Capital and Surplus, Balance",
                            "terseLabel":  "Surplus for guaranty"
                            }
                        }
                    },
                "localname":  "StatutoryAccountingPracticesStatutoryCapitalAndSurplusBalance",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired":  {
                "auth_ref":  [
                    "r470"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of statutory capital required to be maintained as of the balance sheet date under prescribed or permitted statutory accounting practices.",
                            "label":  "Statutory Accounting Practices, Statutory Capital and Surplus Required",
                            "terseLabel":  "Statutory capital and surplus necessary to satisfy regulatory requirements for guaranty"
                            }
                        }
                    },
                "localname":  "StatutoryAccountingPracticesStatutoryCapitalAndSurplusRequired",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StatutoryAccountingPracticesStatutoryNetIncomeAmount":  {
                "auth_ref":  [
                    "r444"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of net income for the period determined using accounting principles prescribed or permitted by insurance regulators.",
                            "label":  "Statutory Accounting Practices, Statutory Net Income Amount",
                            "terseLabel":  "Statutory net income"
                            }
                        }
                    },
                "localname":  "StatutoryAccountingPracticesStatutoryNetIncomeAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/StatutorySurplusAndDividendRestrictionsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StockRepurchasedDuringPeriodValue":  {
                "auth_ref":  [
                    "r16",
                    "r17",
                    "r251",
                    "r256"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury.  Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore.  This element is used when state law does not recognize treasury stock.",
                            "label":  "Stock Repurchased During Period, Value",
                            "negatedTerseLabel":  "Stock repurchases"
                            }
                        }
                    },
                "localname":  "StockRepurchasedDuringPeriodValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StockholdersEquity":  {
                "auth_ref":  [
                    "r17",
                    "r20",
                    "r21",
                    "r159"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
                        "weight":  1.0
                        },
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails":  {
                        "order":  null,
                        "parentTag":  null,
                        "root":  true,
                        "weight":  null
                        }
                    },
                "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",
                            "terseLabel":  "Total stockholders\u2019 equity attributable to Stewart",
                            "totalLabel":  "Total stockholders\u2019 equity"
                            }
                        }
                    },
                "localname":  "StockholdersEquity",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest":  {
                "auth_ref":  [
                    "r330",
                    "r331",
                    "r343"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets":  {
                        "order":  1.0,
                        "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":  "Ending balance",
                            "periodStartLabel":  "Beginning balance",
                            "totalLabel":  "Total stockholders\u2019 equity"
                            }
                        }
                    },
                "localname":  "StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "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.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Different names of stock transactions and the different attributes of each transaction.",
                            "label":  "Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table]",
                            "terseLabel":  "Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table]"
                            }
                        }
                    },
                "localname":  "SubsidiaryOrEquityMethodInvesteeSaleOfStockBySubsidiaryOrEquityInvesteeTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EquityInvesteesAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SubsidiarySaleOfStockLineItems":  {
                "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":  "Subsidiary, Sale of Stock [Line Items]",
                            "terseLabel":  "Subsidiary, Sale of Stock [Line Items]"
                            }
                        }
                    },
                "localname":  "SubsidiarySaleOfStockLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EquityInvesteesAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SupplementalCashFlowInformationAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Supplemental Cash Flow Information [Abstract]",
                            "terseLabel":  "Supplemental information:"
                            }
                        }
                    },
                "localname":  "SupplementalCashFlowInformationAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfCashFlows",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyStatementsOfCashFlowsDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense":  {
                "auth_ref":  [
                    "r463"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails":  {
                        "order":  1.0,
                        "parentTag":  "us-gaap_PolicyholderBenefitsAndClaimsIncurredNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs.",
                            "label":  "Current Year Claims and Claims Adjustment Expense",
                            "terseLabel":  "Current year"
                            }
                        }
                    },
                "localname":  "SupplementalInformationForPropertyCasualtyInsuranceUnderwritersCurrentYearClaimsAndClaimsAdjustmentExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense":  {
                "auth_ref":  [
                    "r463"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails":  {
                        "order":  2.0,
                        "parentTag":  "us-gaap_PolicyholderBenefitsAndClaimsIncurredNet",
                        "weight":  1.0
                        }
                    },
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.",
                            "label":  "Prior Year Claims and Claims Adjustment Expense",
                            "terseLabel":  "Previous policy years",
                            "verboseLabel":  "Net increase in loss reserve estimates for prior policy years"
                            }
                        }
                    },
                "localname":  "SupplementalInformationForPropertyCasualtyInsuranceUnderwritersPriorYearClaimsAndClaimsAdjustmentExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EstimatedTitleLossesAdditionalInformationDetails",
                    "http://www.stewart.com/role/EstimatedTitleLossesEstimatedTitleLossesDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense":  {
                "auth_ref":  [
                    "r461"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of insurance benefit, claim, loss and settlement expenses incurred, as disclosed in supplementary insurance information.",
                            "label":  "SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Benefit, Claim, Loss and Settlement Expenses",
                            "terseLabel":  "Executive insurance policy settlement expenses"
                            }
                        }
                    },
                "localname":  "SupplementaryInsuranceInformationBenefitsClaimsLossesAndSettlementExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_TaxCreditCarryforwardAmount":  {
                "auth_ref":  [
                    "r310"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.",
                            "label":  "Tax Credit Carryforward, Amount",
                            "terseLabel":  "Tax credit carryforwards"
                            }
                        }
                    },
                "localname":  "TaxCreditCarryforwardAmount",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_TaxCreditCarryforwardLineItems":  {
                "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":  "Tax Credit Carryforward [Line Items]",
                            "terseLabel":  "Tax Credit Carryforward [Line Items]"
                            }
                        }
                    },
                "localname":  "TaxCreditCarryforwardLineItems",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_TaxCreditCarryforwardTable":  {
                "auth_ref":  [
                    "r311"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "A listing of tax credit carryforwards available to reduce future taxable income including descriptions, amounts, expiration dates, limitations on use and the related deferred tax assets and valuation allowances.",
                            "label":  "Tax Credit Carryforward [Table]",
                            "terseLabel":  "Tax Credit Carryforward [Table]"
                            }
                        }
                    },
                "localname":  "TaxCreditCarryforwardTable",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails"
                    ],
                "xbrltype":  "stringItemType"
                },
            "us-gaap_TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r316"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act.",
                            "label":  "Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit)",
                            "negatedTerseLabel":  "Total income tax benefit resulting from the 2017 Act"
                            }
                        }
                    },
                "localname":  "TaxCutsAndJobsActOf2017ChangeInTaxRateIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails",
                    "http://www.stewart.com/role/IncomeTaxesReconciliationOfIncomeTaxExpensesComputedAtFederalStatutoryRateWithIncomeTaxExpenseAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentIncomeTaxExpenseBenefit":  {
                "auth_ref":  [
                    "r319"
                    ],
                "crdr":  "debit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of income tax expense (benefit) for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act.",
                            "label":  "Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit)",
                            "negatedLabel":  "Federal and state income tax benefits related to the remeasurement of deferred tax assets and liabilities"
                            }
                        }
                    },
                "localname":  "TaxCutsAndJobsActOf2017MeasurementPeriodAdjustmentIncomeTaxExpenseBenefit",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect":  {
                "auth_ref":  [
                    "r47"
                    ],
                "crdr":  "credit",
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act.",
                            "label":  "Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect",
                            "terseLabel":  "Reclassification of net tax expense from AOCI to retained earning"
                            }
                        }
                    },
                "localname":  "TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/IncomeTaxesAdditionalInformationDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_TradingSecuritiesAndCertainTradingAssetsTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).",
                            "label":  "Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block]",
                            "terseLabel":  "Investments in debt and equity securities",
                            "verboseLabel":  "Net gains (losses) on investments in equity securities still held"
                            }
                        }
                    },
                "localname":  "TradingSecuritiesAndCertainTradingAssetsTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsTables",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain":  {
                "auth_ref":  [
                    "r400"
                    ],
                "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.stewart.com/role/FairValueMeasurementsDetails",
                    "http://www.stewart.com/role/InvestmentIncomeAndNetRealizedAndUnrealizedGainsProceedsFromSaleOfInvestmentDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAdditionalInformationDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAmortizedCostsAndFairValuesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedGainsAndLossesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_TreasuryStockMember":  {
                "auth_ref":  [
                    "r35",
                    "r257"
                    ],
                "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"
                            }
                        }
                    },
                "localname":  "TreasuryStockMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfEquity"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_TreasuryStockShares":  {
                "auth_ref":  [
                    "r35",
                    "r257"
                    ],
                "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",
                            "verboseLabel":  "Treasury stock, common shares (in shares)"
                            }
                        }
                    },
                "localname":  "TreasuryStockShares",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheetsParenthetical",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsAdditionalInformationDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_TreasuryStockValue":  {
                "auth_ref":  [
                    "r35",
                    "r257",
                    "r258"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails":  {
                        "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 \u2013 352,161 common shares, at cost, for 2019 and 2018 (including 145,820 shares held by a subsidiary)",
                            "negatedTerseLabel":  "Treasury stock \u2013 352,161 common shares, at cost"
                            }
                        }
                    },
                "localname":  "TreasuryStockValue",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedBalanceSheets",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyBalanceSheetsDetails"
                    ],
                "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.stewart.com/role/GeneralRecentlyAdoptedAccountingPronouncementsDetails",
                    "http://www.stewart.com/role/ScheduleIFinancialInformationOfRegistrantParentCompanyAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_USGovernmentAgenciesDebtSecuritiesMember":  {
                "auth_ref":  [
                    "r264",
                    "r414"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Debentures, notes, and other debt securities issued by US government agencies, for example, but not limited to, Government National Mortgage Association (GNMA or Ginnie Mae).  Excludes US treasury securities and debt issued by government-sponsored Enterprises (GSEs), for example, but is not limited to, Federal Home Loan Mortgage Corporation (FHLMC or Freddie Mac), Federal National Mortgage Association (FNMA or Fannie Mae), and the Federal Home Loan Bank (FHLB).",
                            "label":  "US Government Agencies Debt Securities [Member]",
                            "terseLabel":  "U.S.  Treasury Bonds"
                            }
                        }
                    },
                "localname":  "USGovernmentAgenciesDebtSecuritiesMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAmortizedCostsAndFairValuesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedGainsAndLossesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_USStatesAndPoliticalSubdivisionsMember":  {
                "auth_ref":  [
                    "r264",
                    "r474"
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Bonds or similar securities issued by state, city, or local US governments or the agencies operated by state, city, or local governments.  Debt securities issued by state governments may include bond issuances of US state authorities including, for example, but not limited to, housing authorities, dormitory authorities, and general obligations while debt securities issued by political subdivisions of US states would include, for example, debt issuances by county, borough, city, or municipal governments.",
                            "label":  "US States and Political Subdivisions Debt Securities [Member]",
                            "terseLabel":  "Municipal"
                            }
                        }
                    },
                "localname":  "USStatesAndPoliticalSubdivisionsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/FairValueMeasurementsDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesAmortizedCostsAndFairValuesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedGainsAndLossesDetails",
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesGrossUnrealizedLossesOnInvestmentsAndFairValuesOfRelatedSecuritiesDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "documentation":  "Tabular disclosure of unrealized gains and losses on investments.",
                            "label":  "Unrealized Gain (Loss) on Investments [Table Text Block]",
                            "terseLabel":  "Gross unrealized gains and losses"
                            }
                        }
                    },
                "localname":  "UnrealizedGainLossOnInvestmentsTableTextBlock",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/InvestmentsInDebtAndEquitySecuritiesTables"
                    ],
                "xbrltype":  "textBlockItemType"
                },
            "us-gaap_ValuationAllowanceOfDeferredTaxAssetsMember":  {
                "auth_ref":  [
                    "r122"
                    ],
                "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":  "Valuation allowance for deferred tax assets"
                            }
                        }
                    },
                "localname":  "ValuationAllowanceOfDeferredTaxAssetsMember",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIiValuationAndQualifyingAccountsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ValuationAllowancesAndReservesBalance":  {
                "auth_ref":  [
                    "r123"
                    ],
                "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 period",
                            "periodStartLabel":  "Balance at beginning of period"
                            }
                        }
                    },
                "localname":  "ValuationAllowancesAndReservesBalance",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIiValuationAndQualifyingAccountsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense":  {
                "auth_ref":  [
                    "r123"
                    ],
                "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 charged to costs and expenses"
                            }
                        }
                    },
                "localname":  "ValuationAllowancesAndReservesChargedToCostAndExpense",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIiValuationAndQualifyingAccountsDetails"
                    ],
                "xbrltype":  "monetaryItemType"
                },
            "us-gaap_ValuationAllowancesAndReservesDeductions":  {
                "auth_ref":  [
                    "r123"
                    ],
                "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",
                            "terseLabel":  "Deductions"
                            }
                        }
                    },
                "localname":  "ValuationAllowancesAndReservesDeductions",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ScheduleIiValuationAndQualifyingAccountsDetails"
                    ],
                "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.stewart.com/role/ScheduleIiValuationAndQualifyingAccountsDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_ValuationAllowancesAndReservesTypeAxis":  {
                "auth_ref":  [
                    "r123"
                    ],
                "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.stewart.com/role/ScheduleIiValuationAndQualifyingAccountsDetails"
                    ],
                "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.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "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.stewart.com/role/NotesPayableAdditionalInformationDetails"
                    ],
                "xbrltype":  "domainItemType"
                },
            "us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding":  {
                "auth_ref":  [
                    "r129",
                    "r134"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/EarningsPerShareDetails":  {
                        "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 average shares outstanding (in shares)",
                            "totalLabel":  "Diluted average shares outstanding (in shares)"
                            }
                        }
                    },
                "localname":  "WeightedAverageNumberOfDilutedSharesOutstanding",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/EarningsPerShareDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_WeightedAverageNumberOfSharesOutstandingBasic":  {
                "auth_ref":  [
                    "r128",
                    "r134"
                    ],
                "calculation":  {
                    "http://www.stewart.com/role/EarningsPerShareDetails":  {
                        "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 average shares outstanding (in shares)",
                            "verboseLabel":  "Basic average shares outstanding (in shares)"
                            }
                        }
                    },
                "localname":  "WeightedAverageNumberOfSharesOutstandingBasic",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/ConsolidatedStatementsOfIncomeAndComprehensiveIncome",
                    "http://www.stewart.com/role/EarningsPerShareDetails"
                    ],
                "xbrltype":  "sharesItemType"
                },
            "us-gaap_WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract":  {
                "auth_ref":  [
                    ],
                "lang":  {
                    "en-US":  {
                        "role":  {
                            "label":  "Weighted Average Number of Shares Outstanding Reconciliation [Abstract]",
                            "terseLabel":  "Denominator (000):"
                            }
                        }
                    },
                "localname":  "WeightedAverageNumberOfSharesOutstandingDilutedDisclosureItemsAbstract",
                "nsuri":  "http://fasb.org/us-gaap/2019-01-31",
                "presentation":  [
                    "http://www.stewart.com/role/EarningsPerShareDetails"
                    ],
                "xbrltype":  "stringItemType"
                }
            },
        "unitCount":  7
        }
    },
"std_ref":  {
    "r0":  {
        "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"
        },
    "r1":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760"
        },
    "r10":  {
        "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"
        },
    "r100":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3098-108585"
        },
    "r101":  {
        "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"
        },
    "r102":  {
        "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"
        },
    "r103":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586"
        },
    "r104":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586"
        },
    "r105":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586"
        },
    "r106":  {
        "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"
        },
    "r107":  {
        "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"
        },
    "r108":  {
        "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"
        },
    "r109":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08(g))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r11":  {
        "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"
        },
    "r110":  {
        "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"
        },
    "r111":  {
        "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"
        },
    "r112":  {
        "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"
        },
    "r113":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.4-08.(e))",
        "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.(e),(f))",
        "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)(2))",
        "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.(h))",
        "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.g)",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690"
        },
    "r118":  {
        "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"
        },
    "r119":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.12-04(b))",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690"
        },
    "r12":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-02(2))",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682"
        },
    "r120":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.12-04)",
        "Topic":  "235",
        "URI":  "http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690"
        },
    "r121":  {
        "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"
        },
    "r122":  {
        "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"
        },
    "r123":  {
        "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"
        },
    "r124":  {
        "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"
        },
    "r125":  {
        "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"
        },
    "r126":  {
        "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"
        },
    "r127":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "250",
        "URI":  "http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794"
        },
    "r128":  {
        "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"
        },
    "r129":  {
        "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"
        },
    "r13":  {
        "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"
        },
    "r130":  {
        "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"
        },
    "r131":  {
        "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"
        },
    "r132":  {
        "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"
        },
    "r133":  {
        "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"
        },
    "r134":  {
        "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"
        },
    "r135":  {
        "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"
        },
    "r136":  {
        "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"
        },
    "r137":  {
        "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"
        },
    "r138":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "260",
        "URI":  "http://asc.fasb.org/topic&trid=2144383"
        },
    "r139":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "270",
        "URI":  "http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306"
        },
    "r14":  {
        "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"
        },
    "r140":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "270",
        "URI":  "http://asc.fasb.org/topic&trid=2126967"
        },
    "r141":  {
        "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"
        },
    "r142":  {
        "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"
        },
    "r143":  {
        "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"
        },
    "r144":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "22",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599"
        },
    "r145":  {
        "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"
        },
    "r146":  {
        "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"
        },
    "r147":  {
        "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"
        },
    "r148":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "25",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599"
        },
    "r149":  {
        "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"
        },
    "r15":  {
        "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"
        },
    "r150":  {
        "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"
        },
    "r151":  {
        "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"
        },
    "r152":  {
        "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"
        },
    "r153":  {
        "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"
        },
    "r154":  {
        "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"
        },
    "r155":  {
        "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"
        },
    "r156":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "280",
        "URI":  "http://asc.fasb.org/topic&trid=2134510"
        },
    "r157":  {
        "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"
        },
    "r158":  {
        "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"
        },
    "r159":  {
        "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"
        },
    "r16":  {
        "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"
        },
    "r160":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562"
        },
    "r161":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562"
        },
    "r162":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
        },
    "r163":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(aa)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
        },
    "r164":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
        },
    "r165":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
        },
    "r166":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563"
        },
    "r167":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563"
        },
    "r168":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563"
        },
    "r169":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563"
        },
    "r17":  {
        "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"
        },
    "r170":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563"
        },
    "r171":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)(1)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563"
        },
    "r172":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)(2)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563"
        },
    "r173":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)(3)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563"
        },
    "r174":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563"
        },
    "r175":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563"
        },
    "r176":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563"
        },
    "r177":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "9",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/extlink&oid=118939692&loc=d3e27357-111563"
        },
    "r178":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "320",
        "URI":  "http://asc.fasb.org/topic&trid=2196928"
        },
    "r179":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "321",
        "URI":  "http://asc.fasb.org/extlink&oid=116654751&loc=SL75117539-209714"
        },
    "r18":  {
        "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"
        },
    "r180":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "321",
        "URI":  "http://asc.fasb.org/extlink&oid=116654751&loc=SL75117546-209714"
        },
    "r181":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "32",
        "Publisher":  "FASB",
        "Section":  "35",
        "SubTopic":  "10",
        "Topic":  "323",
        "URI":  "http://asc.fasb.org/extlink&oid=118954474&loc=d3e32787-111569"
        },
    "r182":  {
        "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"
        },
    "r183":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "323",
        "URI":  "http://asc.fasb.org/extlink&oid=109237563&loc=d3e33775-111570"
        },
    "r184":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "323",
        "URI":  "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33912-111571"
        },
    "r185":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "323",
        "URI":  "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571"
        },
    "r186":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "323",
        "URI":  "http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571"
        },
    "r187":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "323",
        "URI":  "http://asc.fasb.org/topic&trid=2196965"
        },
    "r188":  {
        "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"
        },
    "r189":  {
        "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"
        },
    "r19":  {
        "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"
        },
    "r190":  {
        "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"
        },
    "r191":  {
        "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"
        },
    "r192":  {
        "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"
        },
    "r193":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447"
        },
    "r194":  {
        "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"
        },
    "r195":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454"
        },
    "r196":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)(1)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455"
        },
    "r197":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)(2)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455"
        },
    "r198":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(b)(3)",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455"
        },
    "r199":  {
        "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"
        },
    "r2":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "205",
        "URI":  "http://asc.fasb.org/topic&trid=2122149"
        },
    "r20":  {
        "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"
        },
    "r200":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Topic":  "326",
        "URI":  "http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455"
        },
    "r201":  {
        "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"
        },
    "r202":  {
        "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"
        },
    "r203":  {
        "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"
        },
    "r204":  {
        "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"
        },
    "r205":  {
        "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"
        },
    "r206":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
        },
    "r207":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(d)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267"
        },
    "r208":  {
        "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"
        },
    "r209":  {
        "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"
        },
    "r21":  {
        "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"
        },
    "r210":  {
        "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"
        },
    "r211":  {
        "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"
        },
    "r212":  {
        "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"
        },
    "r213":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)(3)",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275"
        },
    "r214":  {
        "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"
        },
    "r215":  {
        "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"
        },
    "r216":  {
        "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"
        },
    "r217":  {
        "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"
        },
    "r218":  {
        "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"
        },
    "r219":  {
        "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"
        },
    "r22":  {
        "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"
        },
    "r220":  {
        "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"
        },
    "r221":  {
        "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"
        },
    "r222":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "350",
        "URI":  "http://asc.fasb.org/topic&trid=2144416"
        },
    "r223":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "05",
        "SubTopic":  "10",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=109226317&loc=d3e202-110218"
        },
    "r224":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228"
        },
    "r225":  {
        "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"
        },
    "r226":  {
        "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"
        },
    "r227":  {
        "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"
        },
    "r228":  {
        "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"
        },
    "r229":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230"
        },
    "r23":  {
        "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"
        },
    "r230":  {
        "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"
        },
    "r231":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB Topic 5.CC)",
        "Topic":  "360",
        "URI":  "http://asc.fasb.org/extlink&oid=27011434&loc=d3e125687-122742"
        },
    "r232":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)(1)",
        "Topic":  "420",
        "URI":  "http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869"
        },
    "r233":  {
        "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"
        },
    "r234":  {
        "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"
        },
    "r235":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "440",
        "URI":  "http://asc.fasb.org/topic&trid=2144648"
        },
    "r236":  {
        "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"
        },
    "r237":  {
        "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"
        },
    "r238":  {
        "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"
        },
    "r239":  {
        "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"
        },
    "r24":  {
        "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"
        },
    "r240":  {
        "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"
        },
    "r241":  {
        "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"
        },
    "r242":  {
        "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"
        },
    "r243":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "450",
        "URI":  "http://asc.fasb.org/topic&trid=2127136"
        },
    "r244":  {
        "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"
        },
    "r245":  {
        "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"
        },
    "r246":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "8",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "460",
        "URI":  "http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249"
        },
    "r247":  {
        "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"
        },
    "r248":  {
        "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"
        },
    "r249":  {
        "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"
        },
    "r25":  {
        "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"
        },
    "r250":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "470",
        "URI":  "http://asc.fasb.org/topic&trid=2208564"
        },
    "r251":  {
        "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"
        },
    "r252":  {
        "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"
        },
    "r253":  {
        "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"
        },
    "r254":  {
        "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"
        },
    "r255":  {
        "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"
        },
    "r256":  {
        "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"
        },
    "r257":  {
        "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"
        },
    "r258":  {
        "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"
        },
    "r259":  {
        "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"
        },
    "r26":  {
        "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"
        },
    "r260":  {
        "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"
        },
    "r261":  {
        "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"
        },
    "r262":  {
        "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"
        },
    "r263":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "606",
        "URI":  "http://asc.fasb.org/topic&trid=49130388"
        },
    "r264":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(d)(ii)",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
        },
    "r265":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(d)(iv)(01)",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
        },
    "r266":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(i)",
        "Topic":  "715",
        "URI":  "http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920"
        },
    "r267":  {
        "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"
        },
    "r268":  {
        "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"
        },
    "r269":  {
        "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"
        },
    "r27":  {
        "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"
        },
    "r270":  {
        "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"
        },
    "r271":  {
        "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"
        },
    "r272":  {
        "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"
        },
    "r273":  {
        "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"
        },
    "r274":  {
        "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"
        },
    "r275":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r276":  {
        "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"
        },
    "r277":  {
        "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"
        },
    "r278":  {
        "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"
        },
    "r279":  {
        "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"
        },
    "r28":  {
        "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"
        },
    "r280":  {
        "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"
        },
    "r281":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(d)(2)",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901"
        },
    "r282":  {
        "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"
        },
    "r283":  {
        "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"
        },
    "r284":  {
        "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"
        },
    "r285":  {
        "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"
        },
    "r286":  {
        "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"
        },
    "r287":  {
        "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"
        },
    "r288":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "718",
        "URI":  "http://asc.fasb.org/topic&trid=2228938"
        },
    "r289":  {
        "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"
        },
    "r29":  {
        "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"
        },
    "r290":  {
        "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"
        },
    "r291":  {
        "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"
        },
    "r292":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116821951&loc=d3e32059-109318"
        },
    "r293":  {
        "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"
        },
    "r294":  {
        "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"
        },
    "r295":  {
        "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"
        },
    "r296":  {
        "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"
        },
    "r297":  {
        "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"
        },
    "r298":  {
        "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"
        },
    "r299":  {
        "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"
        },
    "r3":  {
        "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"
        },
    "r30":  {
        "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"
        },
    "r300":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319"
        },
    "r301":  {
        "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"
        },
    "r302":  {
        "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"
        },
    "r303":  {
        "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"
        },
    "r304":  {
        "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"
        },
    "r305":  {
        "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"
        },
    "r306":  {
        "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"
        },
    "r307":  {
        "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"
        },
    "r308":  {
        "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"
        },
    "r309":  {
        "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"
        },
    "r31":  {
        "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"
        },
    "r310":  {
        "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"
        },
    "r311":  {
        "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"
        },
    "r312":  {
        "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"
        },
    "r313":  {
        "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"
        },
    "r314":  {
        "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"
        },
    "r315":  {
        "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"
        },
    "r316":  {
        "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"
        },
    "r317":  {
        "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"
        },
    "r318":  {
        "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"
        },
    "r319":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2A",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SAB Topic 5.EE.Q2(f))",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=116825942&loc=SL116722634-122817"
        },
    "r32":  {
        "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"
        },
    "r320":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=109238882&loc=d3e39076-109324"
        },
    "r321":  {
        "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"
        },
    "r322":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(d)",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324"
        },
    "r323":  {
        "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"
        },
    "r324":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "740",
        "URI":  "http://asc.fasb.org/topic&trid=2144680"
        },
    "r325":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "37",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=116868840&loc=d3e2207-128464"
        },
    "r326":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(c)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472"
        },
    "r327":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "31",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "20",
        "Subparagraph":  "(h)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=77890550&loc=d3e5419-128473"
        },
    "r328":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(a)(1)",
        "Topic":  "805",
        "URI":  "http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479"
        },
    "r329":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=108774443&loc=d3e5283-111683"
        },
    "r33":  {
        "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"
        },
    "r330":  {
        "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"
        },
    "r331":  {
        "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"
        },
    "r332":  {
        "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"
        },
    "r333":  {
        "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"
        },
    "r334":  {
        "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"
        },
    "r335":  {
        "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"
        },
    "r336":  {
        "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"
        },
    "r337":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=109239629&loc=d3e5614-111684"
        },
    "r338":  {
        "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"
        },
    "r339":  {
        "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"
        },
    "r34":  {
        "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"
        },
    "r340":  {
        "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"
        },
    "r341":  {
        "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"
        },
    "r342":  {
        "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"
        },
    "r343":  {
        "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"
        },
    "r344":  {
        "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"
        },
    "r345":  {
        "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"
        },
    "r346":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.3A-02)",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=116822174&loc=d3e355033-122828"
        },
    "r347":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.3A-03)",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=116822174&loc=d3e355100-122828"
        },
    "r348":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.3A-04)",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/extlink&oid=116822174&loc=d3e355119-122828"
        },
    "r349":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "810",
        "URI":  "http://asc.fasb.org/topic&trid=2197479"
        },
    "r35":  {
        "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"
        },
    "r350":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r351":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r352":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(bb)",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r353":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258"
        },
    "r354":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258"
        },
    "r355":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "60",
        "SubTopic":  "10",
        "Topic":  "820",
        "URI":  "http://asc.fasb.org/extlink&oid=7493716&loc=d3e21868-110260"
        },
    "r356":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740"
        },
    "r357":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=116690757&loc=SL116692626-108610"
        },
    "r358":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=118260190&loc=d3e13279-108611"
        },
    "r359":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Subparagraph":  "(f)",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612"
        },
    "r36":  {
        "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"
        },
    "r360":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "28",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612"
        },
    "r361":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "65",
        "SubTopic":  "10",
        "Topic":  "825",
        "URI":  "http://asc.fasb.org/extlink&oid=117336053&loc=SL75039408-165497"
        },
    "r362":  {
        "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"
        },
    "r363":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "30",
        "Topic":  "830",
        "URI":  "http://asc.fasb.org/extlink&oid=118261656&loc=d3e32022-110900"
        },
    "r364":  {
        "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"
        },
    "r365":  {
        "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"
        },
    "r366":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(a)",
        "Topic":  "835",
        "URI":  "http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391"
        },
    "r367":  {
        "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"
        },
    "r368":  {
        "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"
        },
    "r369":  {
        "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"
        },
    "r37":  {
        "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"
        },
    "r370":  {
        "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"
        },
    "r371":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "40",
        "Publisher":  "FASB",
        "Section":  "55",
        "SubTopic":  "10",
        "Subparagraph":  "(Note 3)",
        "Topic":  "840",
        "URI":  "http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697"
        },
    "r372":  {
        "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"
        },
    "r373":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(a)",
        "Topic":  "840",
        "URI":  "http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717"
        },
    "r374":  {
        "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"
        },
    "r375":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "30",
        "Subparagraph":  "(b)",
        "Topic":  "840",
        "URI":  "http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737"
        },
    "r376":  {
        "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"
        },
    "r377":  {
        "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"
        },
    "r378":  {
        "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"
        },
    "r379":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918638-209977"
        },
    "r38":  {
        "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"
        },
    "r380":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "20",
        "Subparagraph":  "(a)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977"
        },
    "r381":  {
        "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"
        },
    "r382":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(b)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918666-209980"
        },
    "r383":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(c)",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
        },
    "r384":  {
        "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"
        },
    "r385":  {
        "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"
        },
    "r386":  {
        "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"
        },
    "r387":  {
        "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"
        },
    "r388":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980"
        },
    "r389":  {
        "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"
        },
    "r39":  {
        "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"
        },
    "r390":  {
        "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"
        },
    "r391":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "SubTopic":  "20",
        "Topic":  "842",
        "URI":  "http://asc.fasb.org/subtopic&trid=77888251"
        },
    "r392":  {
        "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"
        },
    "r393":  {
        "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"
        },
    "r394":  {
        "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"
        },
    "r395":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "10",
        "Topic":  "855",
        "URI":  "http://asc.fasb.org/extlink&oid=6842918&loc=SL6314020-165662"
        },
    "r396":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(bb)",
        "Topic":  "860",
        "URI":  "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
        },
    "r397":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(bb)(1)",
        "Topic":  "860",
        "URI":  "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
        },
    "r398":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(bb)(2)",
        "Topic":  "860",
        "URI":  "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
        },
    "r399":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Subparagraph":  "(bb)(3)",
        "Topic":  "860",
        "URI":  "http://asc.fasb.org/extlink&oid=118948506&loc=d3e107207-111719"
        },
    "r4":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(e)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765"
        },
    "r40":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a),(b),(c)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
        },
    "r400":  {
        "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"
        },
    "r401":  {
        "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"
        },
    "r402":  {
        "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"
        },
    "r403":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "SubTopic":  "320",
        "Topic":  "940",
        "URI":  "http://asc.fasb.org/subtopic&trid=2176304"
        },
    "r404":  {
        "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"
        },
    "r405":  {
        "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"
        },
    "r406":  {
        "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"
        },
    "r407":  {
        "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"
        },
    "r408":  {
        "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"
        },
    "r409":  {
        "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"
        },
    "r41":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(e)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
        },
    "r410":  {
        "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"
        },
    "r411":  {
        "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"
        },
    "r412":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(4))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r413":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(5))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r414":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(6)(a)(1))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r415":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03(6))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r416":  {
        "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"
        },
    "r417":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.9-03.15(1),(5))",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878"
        },
    "r418":  {
        "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"
        },
    "r419":  {
        "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"
        },
    "r42":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(f)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
        },
    "r420":  {
        "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"
        },
    "r421":  {
        "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"
        },
    "r422":  {
        "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"
        },
    "r423":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.9-04.9)",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260"
        },
    "r424":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "320",
        "Subparagraph":  "(a)",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803"
        },
    "r425":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "320",
        "Subparagraph":  "(b)",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803"
        },
    "r426":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "320",
        "Subparagraph":  "(c)",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803"
        },
    "r427":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "320",
        "Subparagraph":  "(d)",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803"
        },
    "r428":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "320",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=75019621&loc=d3e62652-112803"
        },
    "r429":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "SubTopic":  "320",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/subtopic&trid=2209399"
        },
    "r43":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "10A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(h)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580"
        },
    "r430":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "405",
        "Topic":  "942",
        "URI":  "http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817"
        },
    "r431":  {
        "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"
        },
    "r432":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "20",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387"
        },
    "r433":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(10))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r434":  {
        "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"
        },
    "r435":  {
        "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"
        },
    "r436":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(1)(b))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r437":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(1)(g))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r438":  {
        "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"
        },
    "r439":  {
        "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"
        },
    "r44":  {
        "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"
        },
    "r440":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(16)(a)(1))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r441":  {
        "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"
        },
    "r442":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(2))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r443":  {
        "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"
        },
    "r444":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03(a)(23)(c))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r445":  {
        "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"
        },
    "r446":  {
        "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"
        },
    "r447":  {
        "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"
        },
    "r448":  {
        "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"
        },
    "r449":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03.13(a)(3),(c))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r45":  {
        "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"
        },
    "r450":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03.15)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r451":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "210",
        "Subparagraph":  "(SX 210.7-03.5)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910"
        },
    "r452":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-03.7(a))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r453":  {
        "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"
        },
    "r454":  {
        "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"
        },
    "r455":  {
        "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"
        },
    "r456":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04(2))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r457":  {
        "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"
        },
    "r458":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04.4)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r459":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04.5)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r46":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580"
        },
    "r460":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "220",
        "Subparagraph":  "(SX 210.7-04.5,6,7)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263"
        },
    "r461":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "235",
        "Subparagraph":  "(SX 210.12-16(Column H))",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=34713774&loc=d3e574960-122915"
        },
    "r462":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "40",
        "Subparagraph":  "(a)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437"
        },
    "r463":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "40",
        "Subparagraph":  "(b)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437"
        },
    "r464":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "40",
        "Subparagraph":  "(c)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437"
        },
    "r465":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "40",
        "Subparagraph":  "(cc)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437"
        },
    "r466":  {
        "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"
        },
    "r467":  {
        "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"
        },
    "r468":  {
        "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"
        },
    "r469":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "505",
        "Subparagraph":  "(a)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529"
        },
    "r47":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL116659650-108580"
        },
    "r470":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "505",
        "Subparagraph":  "(b)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529"
        },
    "r471":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "505",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=6486098&loc=d3e24708-158529"
        },
    "r472":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "3",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "505",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=6486098&loc=d3e24746-158529"
        },
    "r473":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "6",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "505",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=6486098&loc=d3e24790-158529"
        },
    "r474":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "80",
        "Subparagraph":  "(e)",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/extlink&oid=117420044&loc=d3e19393-158473"
        },
    "r475":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "944",
        "URI":  "http://asc.fasb.org/topic&trid=2303980"
        },
    "r476":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "320",
        "Subparagraph":  "(SX 210.12-12(2)(i))",
        "Topic":  "946",
        "URI":  "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010"
        },
    "r477":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "320",
        "Subparagraph":  "(SX 210.12-12C(1)(a))",
        "Topic":  "946",
        "URI":  "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010"
        },
    "r478":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "5",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "320",
        "Subparagraph":  "(SX 210.12-13(1))",
        "Topic":  "946",
        "URI":  "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010"
        },
    "r479":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "320",
        "Subparagraph":  "(SX 210.12-15(Column A))",
        "Topic":  "946",
        "URI":  "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010"
        },
    "r48":  {
        "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"
        },
    "r480":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "7",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "320",
        "Subparagraph":  "(SX 210.12-15)",
        "Topic":  "946",
        "URI":  "http://asc.fasb.org/extlink&oid=50485924&loc=d3e611379-123010"
        },
    "r481":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "SubTopic":  "320",
        "Topic":  "946",
        "URI":  "http://asc.fasb.org/subtopic&trid=2324412"
        },
    "r482":  {
        "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"
        },
    "r483":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "1",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "450",
        "Topic":  "954",
        "URI":  "http://asc.fasb.org/extlink&oid=6491354&loc=d3e6049-115624"
        },
    "r484":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "50",
        "SubTopic":  "450",
        "Topic":  "954",
        "URI":  "http://asc.fasb.org/extlink&oid=6491354&loc=d3e6052-115624"
        },
    "r485":  {
        "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"
        },
    "r486":  {
        "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"
        },
    "r487":  {
        "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"
        },
    "r488":  {
        "Name":  "Exchange Act",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "b"
        },
    "r489":  {
        "Name":  "Exchange Act",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "b-23"
        },
    "r49":  {
        "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"
        },
    "r490":  {
        "Name":  "Exchange Act",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "d1-1"
        },
    "r491":  {
        "Name":  "Forms 10-K, 10-Q, 20-F",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "13",
        "Subsection":  "a-1-"
        },
    "r492":  {
        "Name":  "Forms 10-K, 20-F, 40-F",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "15",
        "Subsection":  "d-1"
        },
    "r493":  {
        "Name":  "Regulation 12B",
        "Number":  "240",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "b-2"
        },
    "r494":  {
        "Name":  "Regulation S-T",
        "Number":  "232",
        "Publisher":  "SEC",
        "Section":  "405"
        },
    "r495":  {
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Publisher":  "SEC",
        "Section":  "11",
        "Subsection":  "03"
        },
    "r496":  {
        "Footnote":  "2",
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "28"
        },
    "r497":  {
        "Footnote":  "4",
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "28"
        },
    "r498":  {
        "Footnote":  "4",
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "29"
        },
    "r499":  {
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Paragraph":  "(a)",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "04"
        },
    "r5":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(f)",
        "Topic":  "210",
        "URI":  "http://asc.fasb.org/extlink&oid=118951113&loc=d3e6812-107765"
        },
    "r50":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=d3e689-108580"
        },
    "r500":  {
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Paragraph":  "a",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "04"
        },
    "r501":  {
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Publisher":  "SEC",
        "Section":  "12",
        "Subsection":  "09"
        },
    "r502":  {
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Paragraph":  "c",
        "Publisher":  "SEC",
        "Section":  "5",
        "Subparagraph":  "Schedule I",
        "Subsection":  "04"
        },
    "r503":  {
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Paragraph":  "c",
        "Publisher":  "SEC",
        "Section":  "7",
        "Subparagraph":  "Schedule II",
        "Subsection":  "05"
        },
    "r504":  {
        "Name":  "Regulation S-X (SX)",
        "Number":  "210",
        "Publisher":  "SEC",
        "Section":  "9",
        "Subsection":  "06"
        },
    "r51":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "17A",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=118930883&loc=SL34724391-108580"
        },
    "r52":  {
        "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"
        },
    "r53":  {
        "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"
        },
    "r54":  {
        "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"
        },
    "r55":  {
        "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"
        },
    "r56":  {
        "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"
        },
    "r57":  {
        "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"
        },
    "r58":  {
        "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"
        },
    "r59":  {
        "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"
        },
    "r6":  {
        "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"
        },
    "r60":  {
        "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"
        },
    "r61":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "4",
        "Publisher":  "FASB",
        "Section":  "65",
        "SubTopic":  "10",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116657190&loc=SL116659633-172590"
        },
    "r62":  {
        "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"
        },
    "r63":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(210.5-03(11))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r64":  {
        "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"
        },
    "r65":  {
        "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"
        },
    "r66":  {
        "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"
        },
    "r67":  {
        "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"
        },
    "r68":  {
        "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"
        },
    "r69":  {
        "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"
        },
    "r7":  {
        "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"
        },
    "r70":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03(b)(4))",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r71":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.19)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r72":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.3)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r73":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "2",
        "Publisher":  "FASB",
        "Section":  "S99",
        "SubTopic":  "10",
        "Subparagraph":  "(SX 210.5-03.7,9)",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227"
        },
    "r74":  {
        "Name":  "Accounting Standards Codification",
        "Publisher":  "FASB",
        "Topic":  "220",
        "URI":  "http://asc.fasb.org/topic&trid=2134417"
        },
    "r75":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "11",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585"
        },
    "r76":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585"
        },
    "r77":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a),(b)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585"
        },
    "r78":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "12",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(c)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585"
        },
    "r79":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
        },
    "r8":  {
        "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"
        },
    "r80":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a),(b)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
        },
    "r81":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "13",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585"
        },
    "r82":  {
        "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"
        },
    "r83":  {
        "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"
        },
    "r84":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "14",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585"
        },
    "r85":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(a)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
        },
    "r86":  {
        "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"
        },
    "r87":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "15",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585"
        },
    "r88":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "16",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(b)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3337-108585"
        },
    "r89":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "17",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(d)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3367-108585"
        },
    "r9":  {
        "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"
        },
    "r90":  {
        "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"
        },
    "r91":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "21D",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=SL94080555-108585"
        },
    "r92":  {
        "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"
        },
    "r93":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "25",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(e)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
        },
    "r94":  {
        "Name":  "Accounting Standards Codification",
        "Paragraph":  "25",
        "Publisher":  "FASB",
        "Section":  "45",
        "SubTopic":  "10",
        "Subparagraph":  "(g)",
        "Topic":  "230",
        "URI":  "http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585"
        },
    "r95":  {
        "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"
        },
    "r96":  {
        "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"
        },
    "r97":  {
        "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"
        },
    "r98":  {
        "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"
        },
    "r99":  {
        "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"
        }
    },
"version":  "2.1"
}

3 Subsequent Filings that Reference this Filing

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

 3/01/21  Stewart Information Svcs Corp.    10-K       12/31/20  118:11M
 8/14/20  Stewart Information Svcs Corp.    424B5                  1:1.6M                                   Toppan Merrill/FA
 8/11/20  Stewart Information Svcs Corp.    424B5                  1:1.6M                                   Toppan Merrill/FA

↑Top

Filing Submission 0000094344-20-000006 – Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)

Stewart Information Services Corp – ‘10-K’ for 12/31/19 – ‘JSON’

On: Thursday, 2/27/20, at 12:08pm ET · For: 12/31/19 · Accession #: 94344-20-6 · File #: 1-02658

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

‘JSON’ — XBRL Instance as JSON Data — MetaLinks

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

3 Subsequent Filings that Reference this Filing

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