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Compensation - Schedule of Compensation Expense Related to Limited Partnership Units and Restricted Stock Units (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award
Issuance of common stock and exchangeability expenses	$ 165,797	$ 110,973	$ 85,918
Total compensation expense	0	(700)	0
Equity-based compensation and allocations of net income to limited partnership units and FPUs	282,045	185,398	139,747
Newmark Holdings Units
Share-based Compensation Arrangement by Share-based Payment Award
Total compensation expense	251,188	163,744	124,805
Equity-based compensation and allocations of net income to limited partnership units and FPUs	282,045	185,398	139,747
Newmark Holdings Units | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units amortization	51,084	29,568	24,620
Total compensation expense	7,900
Newmark Holdings Units | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Issuance of common stock and exchangeability expenses	165,797	110,973	85,918
Limited partnership units amortization	34,307	23,203	14,267
Allocations of net income to limited partnership units and FPUs	$ 30,857	$ 21,654	$ 14,942

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Amount of expense for employee benefit and equity-based compensation.

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