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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 24, 2020
Jun. 28, 2019
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Trading Symbol BGCP    
Title of 12(b) Security Class A Common Stock, $0.01 par value    
Security Exchange Name NASDAQ    
Entity Registrant Name BGC Partners, Inc.    
Entity Central Index Key 0001094831    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 0-28191    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 13-4063515    
Entity Address, Address Line One 499 Park Avenue    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10022    
City Area Code 212    
Local Phone Number 610-2200    
Entity Public Float     $ 1,516,148,852
Documents Incorporated by Reference

Portions of the registrant’s definitive proxy statement for its 2020 annual meeting of stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K

   
Class A Common Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   308,981,508  
Class B Common Stock [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   45,884,380