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Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Detail) - shares
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2021
May 31, 2021
Apr. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share issuances:                
Redemptions/Exchanges of limited partnership interests (in shares)       30,155,970   1,968,788 40,586,915 4,074,189
Restricted stock forfeitures (in shares)       (84,000)   0 (84,000) 0
Treasury stock repurchases (in shares) (15,522,000) (1,018,000) (2,000)   (965,000)   (17,507,000)  
Class A Common Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Shares outstanding at beginning of period (in shares)     334,364,000 334,364,000 323,018,000 311,059,000 323,018,000 307,915,000
Share issuances:                
Redemptions/Exchanges of limited partnership interests (in shares)       30,156,000   1,969,000 40,587,000 4,074,000
Vesting of RSUs (in shares)       360,000   103,000 1,728,000 800,000
Acquisitions (in shares)       537,000   15,000 787,000 285,000
Other issuances of BGC Class A common stock (in shares)       5,000   177,000 266,000 249,000
Restricted stock forfeitures (in shares)       (83,765)   0 (83,765) 0
Treasury stock repurchases (in shares)       (16,542,535)   0 (17,507,006) 0
Shares outstanding at end of period (in shares) 348,795,000     348,795,000 334,364,000 313,323,000 348,795,000 313,323,000