Compensation - Compensation Expense Related to Restricted Stock Unit Held by BGC Employees (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Share-Based Payment Arrangement [Abstract] | ||||
| RSU amortization | $ 41,112 | $ 42,189 | $ 88,149 | $ 81,846 |