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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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Notional value of limited partnership units with post termination pay out amount.

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