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Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Detail) - shares
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share issuances:              
Redemptions/exchanges of limited partnership interests (in shares)         58,024,858 13,190,311 15,008,431
Treasury stock repurchases (in shares) (26,313,000) (24,433,000) (16,542,000) (965,000) (68,253,000)    
Forfeitures of restricted BGC Class A common stock (in shares)         (140,000) 0  
Class A Common Stock              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Shares outstanding at beginning of period (in shares)       323,018,000 323,018,000 307,915,000  
Share issuances:              
Redemptions/exchanges of limited partnership interests (in shares)         58,025,000 13,190,000  
Vesting of RSUs (in shares)         2,167,000 1,134,000  
Acquisitions (in shares)         1,789,000 391,000  
Other issuances of BGC Class A common stock (in shares)         417,000 345,000  
Issuances of BGC Class A Common Stock for general corporate purposes (in shares)         0 45,000  
Treasury stock repurchases (in shares)         (68,253,498) (2,259) (233,172)
Forfeitures of restricted BGC Class A common stock (in shares)         (140,000) 0  
Shares outstanding at end of period (in shares) 317,023,000       317,023,000 323,018,000 307,915,000