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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
Mar. 31, 2024
Feb. 29, 2024
Jan. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Share issuances:            
Redemptions/exchanges of limited partnership interests (in shares)           13,144,521
Treasury stock repurchases (in shares) (1,055,000) (6,586,000) (3,609,000)   (11,250,000) (846,000)
Contingent restricted stock issued (in shares)         20,400,000  
Limited Partnership            
Share issuances:            
Number of units redeemed and cancelled for exchange (in shares)         400,000 7,300,000
Class A Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Shares outstanding at beginning of period (in shares)     390,095,000   390,095,000 325,858,000
Share issuances:            
Redemptions/exchanges of limited partnership interests (in shares)         364,000 13,145,000
Vesting of RSUs (in shares)         3,710,000 2,096,000
Acquisitions (in shares)         472,255 658,000
Other issuances of BGC class A common stock (in shares)         2,379,000 13,000
Restricted stock forfeitures (in shares)         (636,167) (49,201)
Treasury stock repurchases (in shares)       (846,000) (9,820,280) (845,890)
Shares outstanding at end of period (in shares) 385,134,000     340,875,000 385,134,000 340,875,000
Conversion, shares issued (in shares)         400,000 6,900,000