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Compensation - Limited Partnership Units with a Post-Termination Payout (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Liability balance acquisition related post-termination units	$ 6,800
BGC Holdings, L.P.
Share-based Compensation Arrangement by Share-based Payment Award
Notional value	255,356	$ 257,771
Estimated fair value of the post-termination payout	$ 67,839	$ 68,682
Outstanding limited partnership units (in shares)	4,754,973	4,873,040
Outstanding limited partnership units - unvested (in dollars per share)	734,957	873,822
NEWMARK Group Inc Parent
Share-based Compensation Arrangement by Share-based Payment Award
Outstanding limited partnership units (in shares)	20,375,058	20,184,716
Outstanding limited partnership units - unvested (in dollars per share)	9,994,672	9,778,078

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

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- Definition

The number of limited partner units outstanding.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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