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Compensation - Summary of Compensation Expense Related to Amortization of LPUs Held by BGC Employees (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
LPU amortization $ 0 $ 21,431
Stated vesting schedule    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
LPU amortization 0 21,407
Post-termination payout    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
LPU amortization $ 0 $ 24