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Compensation - Compensation Expense Related to Limited Partnership Units and Restricted Stock Units (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award
Issuance of common stock and exchangeability expenses	$ 45,970,000	$ 30,059,000	$ 135,202,000	$ 78,017,000
Total compensation expense	0	0	0	0
Equity-based compensation and allocations of net income to limited partnership units and FPUs			215,610,000	125,678,000
Newmark Holdings Units
Share-based Compensation Arrangement by Share-based Payment Award
Total compensation expense	68,838,000	43,523,000	200,755,000	119,675,000
Equity-based compensation and allocations of net income to limited partnership units and FPUs	81,124,000	48,749,000	215,610,000	125,678,000
Newmark Holdings Units | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units amortization	15,326,000	4,994,000	41,691,000	18,672,000
Total compensation expense	7,900,000		7,900,000
Newmark Holdings Units | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Issuance of common stock and exchangeability expenses	45,970,000	30,059,000	135,202,000	78,017,000
Limited partnership units amortization	7,542,000	8,470,000	23,862,000	22,986,000
Allocations of net income to limited partnership units and FPUs	$ 12,286,000	$ 5,226,000	$ 14,855,000	$ 6,003,000

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

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