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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, 2023
May 31, 2023
Apr. 30, 2023
Jun. 30, 2022
Apr. 30, 2022
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Share issuances:                      
Redemptions/exchanges of limited partnership interests (in shares)           15,974,143   5,064,529   29,118,664 11,707,619
Acquisitions (in shares)               281,230     1,192,907
Restricted stock forfeitures (in shares)           (200,000)   0   (200,000) 0
Treasury stock repurchases (in shares) (3,428,000) (3,300,000) (3,086,000) (7,595,000) 0 (9,814,000) (846,000) (8,745,000) 0 (10,660,000) (8,745,000)
Limited Partnership                      
Share issuances:                      
Number of units redeemed and cancelled for exchange (in shares)           19,100,000   4,800,000   26,400,000 8,100,000
Class A Common Stock                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Shares outstanding at beginning of period (in shares)     340,875,000   326,563,000 340,875,000 325,858,000 326,563,000 317,023,000 325,858,000 317,023,000
Share issuances:                      
Redemptions/exchanges of limited partnership interests (in shares)           17,082,000   5,071,000   30,226,000 11,714,000
Vesting of RSUs (in shares)           534,000   589,000   2,630,000 2,571,000
Acquisitions (in shares)           3,494,000   274,000   4,152,000 1,186,000
Other issuances of BGC class A common stock (in shares)           (3,000)   339,000   11,000 342,000
Restricted stock forfeitures (in shares)           (189,726)   (4,419)   (238,927) (4,419)
Treasury stock repurchases (in shares)           (9,813,827)   (8,745,310)   (10,659,717) (8,745,310)
Shares outstanding at end of period (in shares) 351,978,000     324,087,000   351,978,000 340,875,000 324,087,000 326,563,000 351,978,000 324,087,000
Common stock, shares issued (in shares)           13,300,000   4,700,000   20,200,000 7,900,000