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

BGC Partners, Inc. – ‘10-Q’ for 9/30/16 – ‘XML’

On:  Tuesday, 11/8/16, at 5:41pm ET   ·   As of:  11/9/16   ·   For:  9/30/16   ·   Accession #:  1193125-16-763174   ·   File #:  1-35591

Previous ‘10-Q’:  ‘10-Q’ on 8/8/16 for 6/30/16   ·   Next:  ‘10-Q’ on 5/10/17 for 3/31/17   ·   Latest:  ‘10-Q’ on 11/9/23 for 9/30/23

Find Words in Filings emoji
 		  in    Show  and   ↓Hints

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

11/09/16  BGC Partners, Inc.                10-Q        9/30/16  118:12M                                    Donnelley … Solutions/FA

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

Document/Exhibit                   Description                      Pages   Size 

 1: 10-Q        Quarterly Report                                    HTML   1.27M 
 2: EX-12.1     Statement re: Computation of Ratios                 HTML     46K 
 3: EX-31.1     Certification -- §302 - SOA'02                      HTML     39K 
 4: EX-31.2     Certification -- §302 - SOA'02                      HTML     39K 
 5: EX-32       Certification -- §906 - SOA'02                      HTML     36K 
12: R1          Document and Entity Information                     HTML     60K 
13: R2          Condensed Consolidated Statements of Financial      HTML    141K 
                Condition                                                        
14: R3          Condensed Consolidated Statements of Financial      HTML     50K 
                Condition (Parenthetical)                                        
15: R4          Condensed Consolidated Statements of Operations     HTML    142K 
16: R5          Condensed Consolidated Statements of Comprehensive  HTML     59K 
                Income (Loss)                                                    
17: R6          Condensed Consolidated Statements of Cash Flows     HTML    217K 
18: R7          Condensed Consolidated Statements of Changes in     HTML    140K 
                Equity                                                           
19: R8          Condensed Consolidated Statements of Changes in     HTML     69K 
                Equity (Parenthetical)                                           
20: R9          Organization and Basis of Presentation              HTML     63K 
21: R10         Limited Partnership Interests in BGC Holdings       HTML     51K 
22: R11         Acquisitions                                        HTML     74K 
23: R12         Divestitures                                        HTML     48K 
24: R13         Earnings Per Share                                  HTML     70K 
25: R14         Stock Transactions and Unit Redemptions             HTML     96K 
26: R15         Securities Owned and Securities Sold, Not Yet       HTML     39K 
                Purchased                                                        
27: R16         Collateralized Transactions                         HTML     39K 
28: R17         Marketable Securities                               HTML     45K 
29: R18         Receivables from and Payables to Broker-Dealers,    HTML     51K 
                Clearing Organizations, Customers and Related                    
                Broker-Dealers                                                   
30: R19         Derivatives                                         HTML     77K 
31: R20         Fair Value of Financial Assets and Liabilities      HTML    189K 
32: R21         Related Party Transactions                          HTML    130K 
33: R22         Investments                                         HTML     60K 
34: R23         Fixed Assets, Net                                   HTML     51K 
35: R24         Goodwill and Other Intangible Assets, Net           HTML     89K 
36: R25         Notes Payable, Collateralized and Short-Term        HTML    111K 
                Borrowings                                                       
37: R26         Compensation                                        HTML     85K 
38: R27         Commitments, Contingencies and Guarantees           HTML     49K 
39: R28         Income Taxes                                        HTML     46K 
40: R29         Regulatory Requirements                             HTML     43K 
41: R30         Segment and Geographic Information                  HTML    190K 
42: R31         Subsequent Events                                   HTML     46K 
43: R32         Organization and Basis of Presentation (Policies)   HTML     66K 
44: R33         Acquisitions (Tables)                               HTML     60K 
45: R34         Earnings Per Share (Tables)                         HTML     69K 
46: R35         Stock Transactions and Unit Redemptions (Tables)    HTML     84K 
47: R36         Receivables from and Payables to Broker-Dealers,    HTML     48K 
                Clearing Organizations, Customers and Related                    
                Broker-Dealers (Tables)                                          
48: R37         Derivatives (Tables)                                HTML     62K 
49: R38         Fair Value of Financial Assets and Liabilities      HTML    188K 
                (Tables)                                                         
50: R39         Investments (Tables)                                HTML     53K 
51: R40         Fixed Assets, Net (Tables)                          HTML     43K 
52: R41         Goodwill and Other Intangible Assets, Net (Tables)  HTML     85K 
53: R42         Notes Payable, Collateralized and Short-Term        HTML     83K 
                Borrowings (Tables)                                              
54: R43         Compensation (Tables)                               HTML     63K 
55: R44         Segment and Geographic Information (Tables)         HTML    188K 
56: R45         Organization and Basis of Presentation -            HTML     80K 
                Additional Information (Detail)                                  
57: R46         Limited Partnership Interests in BGC Holdings -     HTML     46K 
                Additional Information (Detail)                                  
58: R47         Acquisitions - Additional Information (Detail)      HTML    135K 
59: R48         Acquisitions - Schedule of Calculation of Purchase  HTML     52K 
                Consideration Transferred (Detail)                               
60: R49         Acquisitions - Schedule of Calculation of Purchase  HTML     46K 
                Consideration Transferred (Parenthetical) (Detail)               
61: R50         Acquisitions - Schedule of Allocation of Assets     HTML     89K 
                Acquired and Liabilities Assumed (Detail)                        
62: R51         Acquisitions - Business Acquisition, Pro Forma      HTML     39K 
                Information (Detail)                                             
63: R52         Divestitures - Additional Information (Detail)      HTML     74K 
64: R53         Earnings Per Share - Calculation of Basic Earnings  HTML     47K 
                Per Share (Detail)                                               
65: R54         Earnings Per Share - Calculation of Fully Diluted   HTML     68K 
                Earnings Per Share (Detail)                                      
66: R55         Earnings Per Share - Additional Information         HTML     50K 
                (Detail)                                                         
67: R56         Stock Transactions and Unit Redemptions -           HTML     78K 
                Additional Information (Detail)                                  
68: R57         Stock Transactions and Unit Redemptions - Changes   HTML     71K 
                in Shares of Class A Common Stock Outstanding                    
                (Detail)                                                         
69: R58         Stock Transactions and Unit Redemptions - Changes   HTML     39K 
                in Shares of Class A Common Stock Outstanding                    
                (Parenthetical) (Detail)                                         
70: R59         Stock Transactions and Unit Redemptions - Unit      HTML     52K 
                Redemption and Share Repurchase Activity (Detail)                
71: R60         Stock Transactions and Unit Redemptions - Unit      HTML     70K 
                Redemption and Share Repurchase Activity                         
                (Parenthetical) (Detail)                                         
72: R61         Stock Transactions and Unit Redemptions - Summary   HTML     50K 
                of Changes in Carrying Amount of Redeemable                      
                Partnership Interest (Detail)                                    
73: R62         Securities Owned and Securities Sold, Not Yet       HTML     41K 
                Purchased - Additional Information (Detail)                      
74: R63         Collateralized Transactions - Additional            HTML     49K 
                Information (Detail)                                             
75: R64         Marketable Securities - Additional Information      HTML     85K 
                (Detail)                                                         
76: R65         Receivables from and Payables to Broker-Dealers,    HTML     61K 
                Clearing Organizations, Customers and Related                    
                Broker-Dealers (Detail)                                          
77: R66         Derivatives - Fair Value of Derivative Contracts    HTML     53K 
                (Detail)                                                         
78: R67         Derivatives - Additional Information (Detail)       HTML     89K 
79: R68         Derivatives - Summary of Gains and Losses on        HTML     53K 
                Derivative Contracts (Detail)                                    
80: R69         Fair Value of Financial Assets and Liabilities -    HTML     99K 
                Fair Value Hierarchy of Financial Assets and                     
                Liabilities under FASB Guidance (Detail)                         
81: R70         Fair Value of Financial Assets and Liabilities -    HTML     56K 
                Changes in Level 3 Contingent Consideration                      
                Measured at Fair Value on Recurring Basis (Detail)               
82: R71         Fair Value of Financial Assets and Liabilities -    HTML    107K 
                Offsetting of Derivative Instruments and                         
                Collateralized Transactions (Detail)                             
83: R72         Fair Value of Financial Assets and Liabilities -    HTML     46K 
                Quantitative Information about Level 3 Fair Value                
                Measurements (Detail)                                            
84: R73         Fair Value of Financial Assets and Liabilities -    HTML     44K 
                Additional Information (Detail)                                  
85: R74         Related Party Transactions - Additional             HTML    709K 
                Information (Detail)                                             
86: R75         Investments - Equity Method and Similar             HTML     43K 
                Investments (Detail)                                             
87: R76         Investments - Additional Information (Detail)       HTML     67K 
88: R77         Investments - Investments in Variable Interest      HTML     42K 
                Entities (Detail)                                                
89: R78         Investments - Investments in Variable Interest      HTML     46K 
                Entities (Parenthetical) (Detail)                                
90: R79         Fixed Assets, Net - Components of Fixed Assets,     HTML     51K 
                Net (Detail)                                                     
91: R80         Fixed Assets, Net - Additional Information          HTML     53K 
                (Detail)                                                         
92: R81         Goodwill and Other Intangible Assets, Net -         HTML     52K 
                Summary of Changes in Carrying Amount of Goodwill                
                by Reportable Segment (Detail)                                   
93: R82         Goodwill and Other Intangible Assets, Net -         HTML     50K 
                Additional Information (Detail)                                  
94: R83         Goodwill and Other Intangible Assets, Net -         HTML     74K 
                Components of Other Intangible Assets (Detail)                   
95: R84         Goodwill and Other Intangible Assets, Net -         HTML     51K 
                Estimated Future Amortization Expense of Definite                
                Life Intangible Assets (Detail)                                  
96: R85         Notes Payable, Collateralized and Short-Term        HTML     53K 
                Borrowings - Notes Payable, Collateralized and                   
                Short-Term Borrowings (Detail)                                   
97: R86         Notes Payable, Collateralized and Short-Term        HTML     51K 
                Borrowings - Notes Payable, Collateralized and                   
                Short-Term Borrowings (Parenthetical) (Detail)                   
98: R87         Notes Payable, Collateralized and Short-Term        HTML     53K 
                Borrowings - Carrying Amounts and Estimated Fair                 
                Values of Company's Convertible Notes and Senior                 
                Notes (Detail)                                                   
99: R88         Notes Payable, Collateralized and Short-Term        HTML     51K 
                Borrowings - Carrying Amounts and Estimated Fair                 
                Values of Company's Convertible Notes and Senior                 
                Notes (Parenthetical) (Detail)                                   
100: R89         Notes Payable, Collateralized and Short-Term        HTML    283K  
                Borrowings - Additional Information (Detail)                     
101: R90         Notes Payable, Collateralized and Short-Term        HTML     59K  
                Borrowings - Summary of Company's Convertible                    
                Notes (Detail)                                                   
102: R91         Notes Payable, Collateralized and Short-Term        HTML     49K  
                Borrowings - Summary of Interest Expense Related                 
                to Company's Convertible Notes (Detail)                          
103: R92         Compensation - Additional Information (Detail)      HTML    149K  
104: R93         Compensation - Activity Associated with Limited     HTML     47K  
                Partnership Units (Detail)                                       
105: R94         Compensation - Activity Associated with Restricted  HTML     63K  
                Stock Units (Detail)                                             
106: R95         Compensation - Activity Associated with Stock       HTML     71K  
                Options (Detail)                                                 
107: R96         Commitments, Contingencies and Guarantees -         HTML     46K  
                Additional Information (Detail)                                  
108: R97         Income Taxes - Additional Information (Detail)      HTML     51K  
109: R98         Regulatory Requirements - Additional Information    HTML     43K  
                (Detail)                                                         
110: R99         Segment and Geographic Information - Additional     HTML     37K  
                Information (Detail)                                             
111: R100        Segment and Geographic Information - Segment        HTML    115K  
                Reporting Information (Detail)                                   
112: R101        Segment and Geographic Information - Total Assets   HTML     42K  
                by Reportable Segment (Detail)                                   
113: R102        Segment and Geographic Information - Geographic     HTML     52K  
                Information Regarding Revenues (Detail)                          
114: R103        Segment and Geographic Information - Information    HTML     50K  
                Regarding Long-Lived Assets in Geographic Areas                  
                (Detail)                                                         
115: R104        Subsequent Events - Additional Information          HTML    108K  
                (Detail)                                                         
117: XML         IDEA XML File -- Filing Summary                      XML    230K  
116: EXCEL       IDEA Workbook of Financial Reports                  XLSX    163K  
 6: EX-101.INS  XBRL Instance -- bgcp-20160930                       XML   3.57M 
 8: EX-101.CAL  XBRL Calculations -- bgcp-20160930_cal               XML    354K 
 9: EX-101.DEF  XBRL Definitions -- bgcp-20160930_def                XML   1.55M 
10: EX-101.LAB  XBRL Labels -- bgcp-20160930_lab                     XML   2.39M 
11: EX-101.PRE  XBRL Presentations -- bgcp-20160930_pre              XML   1.96M 
 7: EX-101.SCH  XBRL Schema -- bgcp-20160930                         XSD    339K 
118: ZIP         XBRL Zipped Folder -- 0001193125-16-763174-xbrl      Zip    352K

‘XML’   —   IDEA XML File — Filing Summary

This Document is an IDEA XML File.

                                                                                                                                                                                
<?xml version="1.0" encoding="windows-1252"?>
<FilingSummary>
<Version> 3.5.0.2 </Version>
<ProcessingTime/>
<ReportFormat> html </ReportFormat>
<ContextCount> 533 </ContextCount>
<ElementCount> 608 </ElementCount>
<EntityCount> 1 </EntityCount>
<FootnotesReported> false </FootnotesReported>
<SegmentCount> 130 </SegmentCount>
<ScenarioCount> 0 </ScenarioCount>
<TuplesReported> false </TuplesReported>
<UnitCount> 7 </UnitCount>
<MyReports>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R1.htm </HtmlFileName>
<LongName> 1001 - Document - Document and Entity Information </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DocumentandEntityInformation </Role>
<ShortName> Document and Entity Information </ShortName>
<MenuCategory> Cover </MenuCategory>
<Position> 1 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R2.htm </HtmlFileName>
<LongName> 1003 - Statement - Condensed Consolidated Statements of Financial Condition </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/StatementOfFinancialPositionUnclassified-RealEstateOperations </Role>
<ShortName> Condensed Consolidated Statements of Financial Condition </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 2 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R3.htm </HtmlFileName>
<LongName> 1004 - Statement - Condensed Consolidated Statements of Financial Condition (Parenthetical) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/StatementOfFinancialPositionUnclassified-RealEstateOperationsParenthetical </Role>
<ShortName> Condensed Consolidated Statements of Financial Condition (Parenthetical) </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 3 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R4.htm </HtmlFileName>
<LongName> 1005 - Statement - Condensed Consolidated Statements of Operations </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/StatementOfIncomeRealEstateInvestmentTrusts </Role>
<ShortName> Condensed Consolidated Statements of Operations </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 4 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R5.htm </HtmlFileName>
<LongName> 1006 - Statement - Condensed Consolidated Statements of Comprehensive Income (Loss) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/StatementOfOtherComprehensiveIncome </Role>
<ShortName> Condensed Consolidated Statements of Comprehensive Income (Loss) </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 5 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R6.htm </HtmlFileName>
<LongName> 1007 - Statement - Condensed Consolidated Statements of Cash Flows </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/StatementOfCashFlowsIndirectRealEstate </Role>
<ShortName> Condensed Consolidated Statements of Cash Flows </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 6 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R7.htm </HtmlFileName>
<LongName> 1008 - Statement - Condensed Consolidated Statements of Changes in Equity </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/StatementOfPartnersCapital </Role>
<ShortName> Condensed Consolidated Statements of Changes in Equity </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 7 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R8.htm </HtmlFileName>
<LongName> 1009 - Statement - Condensed Consolidated Statements of Changes in Equity (Parenthetical) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/StatementOfPartnersCapitalParenthetical </Role>
<ShortName> Condensed Consolidated Statements of Changes in Equity (Parenthetical) </ShortName>
<MenuCategory> Statements </MenuCategory>
<Position> 8 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R9.htm </HtmlFileName>
<LongName> 1010 - Disclosure - Organization and Basis of Presentation </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock </Role>
<ShortName> Organization and Basis of Presentation </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 9 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R10.htm </HtmlFileName>
<LongName> 1011 - Disclosure - Limited Partnership Interests in BGC Holdings </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsPartnersCapitalNotesDisclosureTextBlock </Role>
<ShortName> Limited Partnership Interests in BGC Holdings </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 10 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R11.htm </HtmlFileName>
<LongName> 1012 - Disclosure - Acquisitions </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlock </Role>
<ShortName> Acquisitions </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 11 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R12.htm </HtmlFileName>
<LongName> 1013 - Disclosure - Divestitures </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDisposalGroupsIncludingDiscontinuedOperationsDisclosureTextBlock </Role>
<ShortName> Divestitures </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 12 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R13.htm </HtmlFileName>
<LongName> 1014 - Disclosure - Earnings Per Share </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock </Role>
<ShortName> Earnings Per Share </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 13 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R14.htm </HtmlFileName>
<LongName> 1015 - Disclosure - Stock Transactions and Unit Redemptions </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock </Role>
<ShortName> Stock Transactions and Unit Redemptions </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 14 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R15.htm </HtmlFileName>
<LongName> 1016 - Disclosure - Securities Owned and Securities Sold, Not Yet Purchased </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsSecuritiesOwnedAndSoldNotYetPurchasedAtFairValueDisclosureTextBlock </Role>
<ShortName> Securities Owned and Securities Sold, Not Yet Purchased </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 15 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R16.htm </HtmlFileName>
<LongName> 1017 - Disclosure - Collateralized Transactions </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsRepurchaseAgreementsResaleAgreementsSecuritiesBorrowedAndSecuritiesLoanedDisclosureTextBlock </Role>
<ShortName> Collateralized Transactions </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 16 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R17.htm </HtmlFileName>
<LongName> 1018 - Disclosure - Marketable Securities </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsInvestmentsAndOtherNoncurrentAssetsTextBlock </Role>
<ShortName> Marketable Securities </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 17 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R18.htm </HtmlFileName>
<LongName> 1019 - Disclosure - Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDueToAndFromBrokerDealersAndClearingOrganizationsDisclosure </Role>
<ShortName> Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 18 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R19.htm </HtmlFileName>
<LongName> 1020 - Disclosure - Derivatives </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock </Role>
<ShortName> Derivatives </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 19 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R20.htm </HtmlFileName>
<LongName> 1021 - Disclosure - Fair Value of Financial Assets and Liabilities </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock </Role>
<ShortName> Fair Value of Financial Assets and Liabilities </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 20 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R21.htm </HtmlFileName>
<LongName> 1022 - Disclosure - Related Party Transactions </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsRelatedPartyTransactionsDisclosureTextBlock </Role>
<ShortName> Related Party Transactions </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 21 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R22.htm </HtmlFileName>
<LongName> 1023 - Disclosure - Investments </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsEquityMethodInvestmentsDisclosureTextBlock </Role>
<ShortName> Investments </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 22 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R23.htm </HtmlFileName>
<LongName> 1024 - Disclosure - Fixed Assets, Net </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlock </Role>
<ShortName> Fixed Assets, Net </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 23 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R24.htm </HtmlFileName>
<LongName> 1025 - Disclosure - Goodwill and Other Intangible Assets, Net </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlock </Role>
<ShortName> Goodwill and Other Intangible Assets, Net </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 24 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R25.htm </HtmlFileName>
<LongName> 1026 - Disclosure - Notes Payable, Collateralized and Short-Term Borrowings </LongName>
<ReportType> Notes </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlock </Role>
<ShortName> Notes Payable, Collateralized and Short-Term Borrowings </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 25 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R26.htm </HtmlFileName>
<LongName> 1027 - Disclosure - Compensation </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock </Role>
<ShortName> Compensation </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 26 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R27.htm </HtmlFileName>
<LongName> 1028 - Disclosure - Commitments, Contingencies and Guarantees </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsCommitmentsContingenciesAndGuaranteesTextBlock </Role>
<ShortName> Commitments, Contingencies and Guarantees </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 27 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R28.htm </HtmlFileName>
<LongName> 1029 - Disclosure - Income Taxes </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsIncomeTaxDisclosureTextBlock </Role>
<ShortName> Income Taxes </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 28 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R29.htm </HtmlFileName>
<LongName> 1030 - Disclosure - Regulatory Requirements </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsBrokersAndDealersDisclosureTextBlock </Role>
<ShortName> Regulatory Requirements </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 29 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R30.htm </HtmlFileName>
<LongName> 1031 - Disclosure - Segment and Geographic Information </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock </Role>
<ShortName> Segment and Geographic Information </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 30 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R31.htm </HtmlFileName>
<LongName> 1032 - Disclosure - Subsequent Events </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsSubsequentEventsTextBlock </Role>
<ShortName> Subsequent Events </ShortName>
<MenuCategory> Notes </MenuCategory>
<Position> 31 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R32.htm </HtmlFileName>
<LongName> 1033 - Disclosure - Organization and Basis of Presentation (Policies) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlockPolicies </Role>
<ShortName> Organization and Basis of Presentation (Policies) </ShortName>
<MenuCategory> Policies </MenuCategory>
<Position> 32 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R33.htm </HtmlFileName>
<LongName> 1034 - Disclosure - Acquisitions (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlockTables </Role>
<ShortName> Acquisitions (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlock </ParentRole>
<Position> 33 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R34.htm </HtmlFileName>
<LongName> 1035 - Disclosure - Earnings Per Share (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlockTables </Role>
<ShortName> Earnings Per Share (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock </ParentRole>
<Position> 34 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R35.htm </HtmlFileName>
<LongName> 1036 - Disclosure - Stock Transactions and Unit Redemptions (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlockTables </Role>
<ShortName> Stock Transactions and Unit Redemptions (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock </ParentRole>
<Position> 35 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R36.htm </HtmlFileName>
<LongName> 1037 - Disclosure - Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDueToAndFromBrokerDealersAndClearingOrganizationsDisclosureTables </Role>
<ShortName> Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDueToAndFromBrokerDealersAndClearingOrganizationsDisclosure </ParentRole>
<Position> 36 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R37.htm </HtmlFileName>
<LongName> 1038 - Disclosure - Derivatives (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlockTables </Role>
<ShortName> Derivatives (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock </ParentRole>
<Position> 37 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R38.htm </HtmlFileName>
<LongName> 1039 - Disclosure - Fair Value of Financial Assets and Liabilities (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlockTables </Role>
<ShortName> Fair Value of Financial Assets and Liabilities (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsFairValueDisclosuresTextBlock </ParentRole>
<Position> 38 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R39.htm </HtmlFileName>
<LongName> 1040 - Disclosure - Investments (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsEquityMethodInvestmentsDisclosureTextBlockTables </Role>
<ShortName> Investments (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsEquityMethodInvestmentsDisclosureTextBlock </ParentRole>
<Position> 39 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R40.htm </HtmlFileName>
<LongName> 1041 - Disclosure - Fixed Assets, Net (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlockTables </Role>
<ShortName> Fixed Assets, Net (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsPropertyPlantAndEquipmentDisclosureTextBlock </ParentRole>
<Position> 40 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R41.htm </HtmlFileName>
<LongName> 1042 - Disclosure - Goodwill and Other Intangible Assets, Net (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlockTables </Role>
<ShortName> Goodwill and Other Intangible Assets, Net (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlock </ParentRole>
<Position> 41 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R42.htm </HtmlFileName>
<LongName> 1043 - Disclosure - Notes Payable, Collateralized and Short-Term Borrowings (Tables) </LongName>
<ReportType> Notes </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlockTables </Role>
<ShortName> Notes Payable, Collateralized and Short-Term Borrowings (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlock </ParentRole>
<Position> 42 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R43.htm </HtmlFileName>
<LongName> 1044 - Disclosure - Compensation (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockTables </Role>
<ShortName> Compensation (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock </ParentRole>
<Position> 43 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R44.htm </HtmlFileName>
<LongName> 1045 - Disclosure - Segment and Geographic Information (Tables) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables </Role>
<ShortName> Segment and Geographic Information (Tables) </ShortName>
<MenuCategory> Tables </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock </ParentRole>
<Position> 44 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R45.htm </HtmlFileName>
<LongName> 1046 - Disclosure - Organization and Basis of Presentation - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureOrganizationAndBasisOfPresentationAdditionalInformation </Role>
<ShortName> Organization and Basis of Presentation - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 45 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R46.htm </HtmlFileName>
<LongName> 1047 - Disclosure - Limited Partnership Interests in BGC Holdings - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureLimitedPartnershipInterestsInBGCHoldingsAdditionalInformation </Role>
<ShortName> Limited Partnership Interests in BGC Holdings - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 46 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R47.htm </HtmlFileName>
<LongName> 1048 - Disclosure - Acquisitions - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureAcquisitionsAdditionalInformation </Role>
<ShortName> Acquisitions - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 47 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R48.htm </HtmlFileName>
<LongName> 1049 - Disclosure - Acquisitions - Schedule of Calculation of Purchase Consideration Transferred (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureAcquisitionsScheduleOfCalculationOfPurchaseConsiderationTransferred </Role>
<ShortName> Acquisitions - Schedule of Calculation of Purchase Consideration Transferred (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 48 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R49.htm </HtmlFileName>
<LongName> 1050 - Disclosure - Acquisitions - Schedule of Calculation of Purchase Consideration Transferred (Parenthetical) (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureAcquisitionsScheduleOfCalculationOfPurchaseConsiderationTransferredParenthetical </Role>
<ShortName> Acquisitions - Schedule of Calculation of Purchase Consideration Transferred (Parenthetical) (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 49 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R50.htm </HtmlFileName>
<LongName> 1051 - Disclosure - Acquisitions - Schedule of Allocation of Assets Acquired and Liabilities Assumed (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureAcquisitionsScheduleOfAllocationOfAssetsAcquiredAndLiabilitiesAssumed </Role>
<ShortName> Acquisitions - Schedule of Allocation of Assets Acquired and Liabilities Assumed (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 50 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R51.htm </HtmlFileName>
<LongName> 1052 - Disclosure - Acquisitions - Business Acquisition, Pro Forma Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureAcquisitionsBusinessAcquisitionProFormaInformation </Role>
<ShortName> Acquisitions - Business Acquisition, Pro Forma Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 51 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R52.htm </HtmlFileName>
<LongName> 1053 - Disclosure - Divestitures - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureDivestituresAdditionalInformation </Role>
<ShortName> Divestitures - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 52 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R53.htm </HtmlFileName>
<LongName> 1054 - Disclosure - Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureEarningsPerShareCalculationOfBasicEarningsPerShare </Role>
<ShortName> Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 53 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R54.htm </HtmlFileName>
<LongName> 1055 - Disclosure - Earnings Per Share - Calculation of Fully Diluted Earnings Per Share (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureEarningsPerShareCalculationOfFullyDilutedEarningsPerShare </Role>
<ShortName> Earnings Per Share - Calculation of Fully Diluted Earnings Per Share (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 54 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R55.htm </HtmlFileName>
<LongName> 1056 - Disclosure - Earnings Per Share - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureEarningsPerShareAdditionalInformation </Role>
<ShortName> Earnings Per Share - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 55 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R56.htm </HtmlFileName>
<LongName> 1057 - Disclosure - Stock Transactions and Unit Redemptions - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureStockTransactionsAndUnitRedemptionsAdditionalInformation </Role>
<ShortName> Stock Transactions and Unit Redemptions - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 56 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R57.htm </HtmlFileName>
<LongName> 1058 - Disclosure - Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureStockTransactionsAndUnitRedemptionsChangesInSharesOfClassACommonStockOutstanding </Role>
<ShortName> Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 57 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R58.htm </HtmlFileName>
<LongName> 1059 - Disclosure - Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Parenthetical) (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureStockTransactionsAndUnitRedemptionsChangesInSharesOfClassACommonStockOutstandingParenthetical </Role>
<ShortName> Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Parenthetical) (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 58 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R59.htm </HtmlFileName>
<LongName> 1060 - Disclosure - Stock Transactions and Unit Redemptions - Unit Redemption and Share Repurchase Activity (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureStockTransactionsAndUnitRedemptionsUnitRedemptionAndShareRepurchaseActivity </Role>
<ShortName> Stock Transactions and Unit Redemptions - Unit Redemption and Share Repurchase Activity (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 59 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R60.htm </HtmlFileName>
<LongName> 1061 - Disclosure - Stock Transactions and Unit Redemptions - Unit Redemption and Share Repurchase Activity (Parenthetical) (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureStockTransactionsAndUnitRedemptionsUnitRedemptionAndShareRepurchaseActivityParenthetical </Role>
<ShortName> Stock Transactions and Unit Redemptions - Unit Redemption and Share Repurchase Activity (Parenthetical) (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 60 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R61.htm </HtmlFileName>
<LongName> 1062 - Disclosure - Stock Transactions and Unit Redemptions - Summary of Changes in Carrying Amount of Redeemable Partnership Interest (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureStockTransactionsAndUnitRedemptionsSummaryOfChangesInCarryingAmountOfRedeemablePartnershipInterest </Role>
<ShortName> Stock Transactions and Unit Redemptions - Summary of Changes in Carrying Amount of Redeemable Partnership Interest (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 61 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R62.htm </HtmlFileName>
<LongName> 1063 - Disclosure - Securities Owned and Securities Sold, Not Yet Purchased - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureSecuritiesOwnedAndSecuritiesSoldNotYetPurchasedAdditionalInformation </Role>
<ShortName> Securities Owned and Securities Sold, Not Yet Purchased - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 62 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R63.htm </HtmlFileName>
<LongName> 1064 - Disclosure - Collateralized Transactions - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureCollateralizedTransactionsAdditionalInformation </Role>
<ShortName> Collateralized Transactions - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 63 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R64.htm </HtmlFileName>
<LongName> 1065 - Disclosure - Marketable Securities - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureMarketableSecuritiesAdditionalInformation </Role>
<ShortName> Marketable Securities - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 64 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R65.htm </HtmlFileName>
<LongName> 1066 - Disclosure - Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureReceivablesFromAndPayablesToBrokerDealersClearingOrganizationsCustomersAndRelatedBrokerDealers </Role>
<ShortName> Receivables from and Payables to Broker-Dealers, Clearing Organizations, Customers and Related Broker-Dealers (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<ParentRole> http://www.bgcpartners.com/taxonomy/role/NotesToFinancialStatementsDueToAndFromBrokerDealersAndClearingOrganizationsDisclosureTables </ParentRole>
<Position> 65 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R66.htm </HtmlFileName>
<LongName> 1067 - Disclosure - Derivatives - Fair Value of Derivative Contracts (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureDerivativesFairValueOfDerivativeContracts </Role>
<ShortName> Derivatives - Fair Value of Derivative Contracts (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 66 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R67.htm </HtmlFileName>
<LongName> 1068 - Disclosure - Derivatives - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureDerivativesAdditionalInformation </Role>
<ShortName> Derivatives - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 67 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R68.htm </HtmlFileName>
<LongName> 1069 - Disclosure - Derivatives - Summary of Gains and Losses on Derivative Contracts (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureDerivativesSummaryOfGainsAndLossesOnDerivativeContracts </Role>
<ShortName> Derivatives - Summary of Gains and Losses on Derivative Contracts (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 68 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R69.htm </HtmlFileName>
<LongName> 1070 - Disclosure - Fair Value of Financial Assets and Liabilities - Fair Value Hierarchy of Financial Assets and Liabilities under FASB Guidance (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureFairValueOfFinancialAssetsAndLiabilitiesFairValueHierarchyOfFinancialAssetsAndLiabilitiesUnderFASBGuidance </Role>
<ShortName> Fair Value of Financial Assets and Liabilities - Fair Value Hierarchy of Financial Assets and Liabilities under FASB Guidance (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 69 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R70.htm </HtmlFileName>
<LongName> 1072 - Disclosure - Fair Value of Financial Assets and Liabilities - Changes in Level 3 Contingent Consideration Measured at Fair Value on Recurring Basis (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureFairValueOfFinancialAssetsAndLiabilitiesChangesInLevel3ContingentConsiderationMeasuredAtFairValueOnRecurringBasis </Role>
<ShortName> Fair Value of Financial Assets and Liabilities - Changes in Level 3 Contingent Consideration Measured at Fair Value on Recurring Basis (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 70 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R71.htm </HtmlFileName>
<LongName> 1073 - Disclosure - Fair Value of Financial Assets and Liabilities - Offsetting of Derivative Instruments and Collateralized Transactions (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureFairValueOfFinancialAssetsAndLiabilitiesOffsettingOfDerivativeInstrumentsAndCollateralizedTransactions </Role>
<ShortName> Fair Value of Financial Assets and Liabilities - Offsetting of Derivative Instruments and Collateralized Transactions (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 71 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R72.htm </HtmlFileName>
<LongName> 1074 - Disclosure - Fair Value of Financial Assets and Liabilities - Quantitative Information about Level 3 Fair Value Measurements (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureFairValueOfFinancialAssetsAndLiabilitiesQuantitativeInformationAboutLevel3FairValueMeasurements </Role>
<ShortName> Fair Value of Financial Assets and Liabilities - Quantitative Information about Level 3 Fair Value Measurements (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 72 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R73.htm </HtmlFileName>
<LongName> 1075 - Disclosure - Fair Value of Financial Assets and Liabilities - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureFairValueOfFinancialAssetsAndLiabilitiesAdditionalInformation </Role>
<ShortName> Fair Value of Financial Assets and Liabilities - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 73 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R74.htm </HtmlFileName>
<LongName> 1076 - Disclosure - Related Party Transactions - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformation </Role>
<ShortName> Related Party Transactions - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 74 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R75.htm </HtmlFileName>
<LongName> 1077 - Disclosure - Investments - Equity Method and Similar Investments (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureInvestmentsEquityMethodAndSimilarInvestments </Role>
<ShortName> Investments - Equity Method and Similar Investments (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 75 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R76.htm </HtmlFileName>
<LongName> 1078 - Disclosure - Investments - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureInvestmentsAdditionalInformation </Role>
<ShortName> Investments - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 76 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R77.htm </HtmlFileName>
<LongName> 1079 - Disclosure - Investments - Investments in Variable Interest Entities (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureInvestmentsInvestmentsInVariableInterestEntities </Role>
<ShortName> Investments - Investments in Variable Interest Entities (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 77 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R78.htm </HtmlFileName>
<LongName> 1080 - Disclosure - Investments - Investments in Variable Interest Entities (Parenthetical) (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureInvestmentsInvestmentsInVariableInterestEntitiesParenthetical </Role>
<ShortName> Investments - Investments in Variable Interest Entities (Parenthetical) (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 78 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R79.htm </HtmlFileName>
<LongName> 1081 - Disclosure - Fixed Assets, Net - Components of Fixed Assets, Net (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureFixedAssetsNetComponentsOfFixedAssetsNet </Role>
<ShortName> Fixed Assets, Net - Components of Fixed Assets, Net (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 79 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R80.htm </HtmlFileName>
<LongName> 1082 - Disclosure - Fixed Assets, Net - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureFixedAssetsNetAdditionalInformation </Role>
<ShortName> Fixed Assets, Net - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 80 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R81.htm </HtmlFileName>
<LongName> 1083 - Disclosure - Goodwill and Other Intangible Assets, Net - Summary of Changes in Carrying Amount of Goodwill by Reportable Segment (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsNetSummaryOfChangesInCarryingAmountOfGoodwillByReportableSegment </Role>
<ShortName> Goodwill and Other Intangible Assets, Net - Summary of Changes in Carrying Amount of Goodwill by Reportable Segment (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 81 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R82.htm </HtmlFileName>
<LongName> 1084 - Disclosure - Goodwill and Other Intangible Assets, Net - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsNetAdditionalInformation </Role>
<ShortName> Goodwill and Other Intangible Assets, Net - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 82 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R83.htm </HtmlFileName>
<LongName> 1085 - Disclosure - Goodwill and Other Intangible Assets, Net - Components of Other Intangible Assets (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsNetComponentsOfOtherIntangibleAssets </Role>
<ShortName> Goodwill and Other Intangible Assets, Net - Components of Other Intangible Assets (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 83 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R84.htm </HtmlFileName>
<LongName> 1086 - Disclosure - Goodwill and Other Intangible Assets, Net - Estimated Future Amortization Expense of Definite Life Intangible Assets (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsNetEstimatedFutureAmortizationExpenseOfDefiniteLifeIntangibleAssets </Role>
<ShortName> Goodwill and Other Intangible Assets, Net - Estimated Future Amortization Expense of Definite Life Intangible Assets (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 84 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R85.htm </HtmlFileName>
<LongName> 1087 - Disclosure - Notes Payable, Collateralized and Short-Term Borrowings - Notes Payable, Collateralized and Short-Term Borrowings (Detail) </LongName>
<ReportType> Notes </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureNotesPayableCollateralizedAndShortTermBorrowingsNotesPayableCollateralizedAndShortTermBorrowings </Role>
<ShortName> Notes Payable, Collateralized and Short-Term Borrowings - Notes Payable, Collateralized and Short-Term Borrowings (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 85 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R86.htm </HtmlFileName>
<LongName> 1088 - Disclosure - Notes Payable, Collateralized and Short-Term Borrowings - Notes Payable, Collateralized and Short-Term Borrowings (Parenthetical) (Detail) </LongName>
<ReportType> Notes </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureNotesPayableCollateralizedAndShortTermBorrowingsNotesPayableCollateralizedAndShortTermBorrowingsParenthetical </Role>
<ShortName> Notes Payable, Collateralized and Short-Term Borrowings - Notes Payable, Collateralized and Short-Term Borrowings (Parenthetical) (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 86 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R87.htm </HtmlFileName>
<LongName> 1089 - Disclosure - Notes Payable, Collateralized and Short-Term Borrowings - Carrying Amounts and Estimated Fair Values of Company's Convertible Notes and Senior Notes (Detail) </LongName>
<ReportType> Notes </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureNotesPayableCollateralizedAndShortTermBorrowingsCarryingAmountsAndEstimatedFairValuesOfCompanysConvertibleNotesAndSeniorNotes </Role>
<ShortName> Notes Payable, Collateralized and Short-Term Borrowings - Carrying Amounts and Estimated Fair Values of Company's Convertible Notes and Senior Notes (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 87 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R88.htm </HtmlFileName>
<LongName> 1090 - Disclosure - Notes Payable, Collateralized and Short-Term Borrowings - Carrying Amounts and Estimated Fair Values of Company's Convertible Notes and Senior Notes (Parenthetical) (Detail) </LongName>
<ReportType> Notes </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureNotesPayableCollateralizedAndShortTermBorrowingsCarryingAmountsAndEstimatedFairValuesOfCompanysConvertibleNotesAndSeniorNotesParenthetical </Role>
<ShortName> Notes Payable, Collateralized and Short-Term Borrowings - Carrying Amounts and Estimated Fair Values of Company's Convertible Notes and Senior Notes (Parenthetical) (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 88 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R89.htm </HtmlFileName>
<LongName> 1091 - Disclosure - Notes Payable, Collateralized and Short-Term Borrowings - Additional Information (Detail) </LongName>
<ReportType> Notes </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureNotesPayableCollateralizedAndShortTermBorrowingsAdditionalInformation </Role>
<ShortName> Notes Payable, Collateralized and Short-Term Borrowings - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 89 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R90.htm </HtmlFileName>
<LongName> 1092 - Disclosure - Notes Payable, Collateralized and Short-Term Borrowings - Summary of Company's Convertible Notes (Detail) </LongName>
<ReportType> Notes </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureNotesPayableCollateralizedAndShortTermBorrowingsSummaryOfCompanysConvertibleNotes </Role>
<ShortName> Notes Payable, Collateralized and Short-Term Borrowings - Summary of Company's Convertible Notes (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 90 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R91.htm </HtmlFileName>
<LongName> 1093 - Disclosure - Notes Payable, Collateralized and Short-Term Borrowings - Summary of Interest Expense Related to Company's Convertible Notes (Detail) </LongName>
<ReportType> Notes </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureNotesPayableCollateralizedAndShortTermBorrowingsSummaryOfInterestExpenseRelatedToCompanysConvertibleNotes </Role>
<ShortName> Notes Payable, Collateralized and Short-Term Borrowings - Summary of Interest Expense Related to Company's Convertible Notes (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 91 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R92.htm </HtmlFileName>
<LongName> 1094 - Disclosure - Compensation - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureCompensationAdditionalInformation </Role>
<ShortName> Compensation - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 92 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R93.htm </HtmlFileName>
<LongName> 1095 - Disclosure - Compensation - Activity Associated with Limited Partnership Units (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureCompensationActivityAssociatedWithLimitedPartnershipUnits </Role>
<ShortName> Compensation - Activity Associated with Limited Partnership Units (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 93 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R94.htm </HtmlFileName>
<LongName> 1096 - Disclosure - Compensation - Activity Associated with Restricted Stock Units (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureCompensationActivityAssociatedWithRestrictedStockUnits </Role>
<ShortName> Compensation - Activity Associated with Restricted Stock Units (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 94 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R95.htm </HtmlFileName>
<LongName> 1097 - Disclosure - Compensation - Activity Associated with Stock Options (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureCompensationActivityAssociatedWithStockOptions </Role>
<ShortName> Compensation - Activity Associated with Stock Options (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 95 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R96.htm </HtmlFileName>
<LongName> 1098 - Disclosure - Commitments, Contingencies and Guarantees - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureCommitmentsContingenciesAndGuaranteesAdditionalInformation </Role>
<ShortName> Commitments, Contingencies and Guarantees - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 96 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R97.htm </HtmlFileName>
<LongName> 1099 - Disclosure - Income Taxes - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureIncomeTaxesAdditionalInformation </Role>
<ShortName> Income Taxes - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 97 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R98.htm </HtmlFileName>
<LongName> 1100 - Disclosure - Regulatory Requirements - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureRegulatoryRequirementsAdditionalInformation </Role>
<ShortName> Regulatory Requirements - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 98 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R99.htm </HtmlFileName>
<LongName> 1101 - Disclosure - Segment and Geographic Information - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureSegmentAndGeographicInformationAdditionalInformation </Role>
<ShortName> Segment and Geographic Information - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 99 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R100.htm </HtmlFileName>
<LongName> 1102 - Disclosure - Segment and Geographic Information - Segment Reporting Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureSegmentAndGeographicInformationSegmentReportingInformation </Role>
<ShortName> Segment and Geographic Information - Segment Reporting Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 100 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R101.htm </HtmlFileName>
<LongName> 1103 - Disclosure - Segment and Geographic Information - Total Assets by Reportable Segment (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureSegmentAndGeographicInformationTotalAssetsByReportableSegment </Role>
<ShortName> Segment and Geographic Information - Total Assets by Reportable Segment (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 101 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R102.htm </HtmlFileName>
<LongName> 1104 - Disclosure - Segment and Geographic Information - Geographic Information Regarding Revenues (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureSegmentAndGeographicInformationGeographicInformationRegardingRevenues </Role>
<ShortName> Segment and Geographic Information - Geographic Information Regarding Revenues (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 102 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R103.htm </HtmlFileName>
<LongName> 1105 - Disclosure - Segment and Geographic Information - Information Regarding Long-Lived Assets in Geographic Areas (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureSegmentAndGeographicInformationInformationRegardingLongLivedAssetsInGeographicAreas </Role>
<ShortName> Segment and Geographic Information - Information Regarding Long-Lived Assets in Geographic Areas (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 103 </Position>
</Report>
<Report instance="bgcp-20160930.xml">
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<HtmlFileName> R104.htm </HtmlFileName>
<LongName> 1106 - Disclosure - Subsequent Events - Additional Information (Detail) </LongName>
<ReportType> Sheet </ReportType>
<Role> http://www.bgcpartners.com/taxonomy/role/DisclosureSubsequentEventsAdditionalInformation </Role>
<ShortName> Subsequent Events - Additional Information (Detail) </ShortName>
<MenuCategory> Details </MenuCategory>
<Position> 104 </Position>
</Report>
<Report>
<IsDefault> false </IsDefault>
<HasEmbeddedReports> false </HasEmbeddedReports>
<LongName> All Reports </LongName>
<ReportType> Book </ReportType>
<ShortName> All Reports </ShortName>
</Report>
</MyReports>
<InputFiles>
<File> bgcp-20160930.xml </File>
<File> bgcp-20160930.xsd </File>
<File> bgcp-20160930_cal.xml </File>
<File> bgcp-20160930_def.xml </File>
<File> bgcp-20160930_lab.xml </File>
<File> bgcp-20160930_pre.xml </File>
</InputFiles>
<SupplementalFiles/>
<BaseTaxonomies/>
<HasPresentationLinkbase> true </HasPresentationLinkbase>
<HasCalculationLinkbase> true </HasCalculationLinkbase>
</FilingSummary>

↑Top
Filing Submission 0001193125-16-763174   –   Alternative Formats (Word / Rich Text, HTML, Plain Text, et al.)
Copyright © 2024 Fran Finnegan & Company LLC – All Rights Reserved.
About — Privacy — Redactions — Help — Sat., May 4, 2:15:05.2pm ET