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Compensation - Activity Associated with LPU's Held by BGC Employees (Detail) - LPUs - shares
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Number of Units, Balance outstanding at beginning of period (in shares) 112,115,000 137,652,000 102,407,000
Number of Units, Granted (in shares) 27,968,000 34,093,000 50,269,000
Number of Units, Redeemed/exchanged units (in shares) (24,623,000) (58,832,000) (14,642,000)
Number of Units, Forfeited units (in shares) (5,112,000) (798,000) (382,000)
Number of Units, Balance outstanding at end of period (in shares) 110,348,000 112,115,000 137,652,000
Newmark Units      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Number of Units, Balance outstanding at beginning of period (in shares) 11,051,000 13,202,000 14,607,000
Number of Units, Granted (in shares) 0 0 0
Number of Units, Redeemed/exchanged units (in shares) (1,636,000) (1,881,000) (1,300,000)
Number of Units, Forfeited units (in shares) (64,000) (270,000) (105,000)
Number of Units, Balance outstanding at end of period (in shares) 9,351,000 11,051,000 13,202,000