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Compensation - Limited Partnership Units with a Post-Termination Payout (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
BGC Holdings, L.P. |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Notional Value | $ 152,523 | $ 161,861
Estimated fair value of the post-termination payout | $ 58,100 | $ 56,210
Newmark Holdings Units |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Outstanding limited partnership units (in shares) | 15,312,960 | 17,249,585
Outstanding limited partnership units - unvested (in dollars per share) | 4,199,595 | 5,570,815

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