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Related Party Transactions - Service Agreements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Related Party Transaction [Line Items] |  |  |  |
Total revenues | $ 784,004 | $ 550,761 | $ 1,448,244 | $ 1,129,375
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 | $ 1,100 | 500 | $ 1,600 | 700
Compensation to leased employees | 24,900 | 17,700 | 52,900 | 37,100
Related Party | Service Agreement with Cantor |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Total revenues | 5,200 | 4,600 | 9,700 | 9,100
Service charges | $ 35,300 | $ 25,700 | $ 71,700 | $ 52,300

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