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Compensation - Compensation Expense Related to Limited Partnership Units and Restricted Stock Units (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Issuance of common stock and exchangeability expenses	$ 24,583,000	$ 8,983,000
Equity-based compensation and allocations of net income to limited partnership units and FPUs	35,648,000	16,899,000
Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Issuance of common stock and exchangeability expenses	0	0
NEWMARK Group Inc Parent
Share-based Compensation Arrangement by Share-based Payment Award
Equity-based compensation and allocations of net income to limited partnership units and FPUs	35,648,000	16,899,000
NEWMARK Group Inc Parent | Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units amortization	5,963,000	4,495,000
NEWMARK Group Inc Parent | Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Issuance of common stock and exchangeability expenses	24,583,000	8,983,000
Allocations of net income to limited partnership units and FPUs	241,000	147,000
Limited partnership units amortization	$ 4,861,000	$ 3,274,000

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Common Stock, Exchangeability Granted, Issued, Expense

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- Definition

Equity Based Compensation And Allocation Of Net Income To Limited Partnership Units And FPUs

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- Definition

Amount of equity impact of cash distribution declared to unit-holder of limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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

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