v3.26.1
Related Party Transactions - Service Agreements (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Related Party Transaction [Line Items]        
Total revenues $ 845,545 $ 784,004 $ 1,801,026 $ 1,448,244
Tower Bridge International Services LP | BGC Partners, Inc.        
Related Party Transaction [Line Items]        
Company ownership of Tower Bridge (as a percent)     52.00%  
Tower Bridge International Services LP | Cantor        
Related Party Transaction [Line Items]        
Ownership percentage by noncontrolling owners (as a percent) 48.00%   48.00%  
Related Party        
Related Party Transaction [Line Items]        
Mark-up cost of services (as a percent)     7.50%  
Share of net profit (loss) from noncontrolling interest $ 600 1,100 $ 1,700 1,600
Compensation to leased employees 25,700 24,900 53,500 52,900
Related Party | Service Agreement with Cantor        
Related Party Transaction [Line Items]        
Total revenues 5,500 5,200 9,800 9,700
Service charges $ 35,400 $ 35,300 $ 71,300 $ 71,700