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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, 2023	Dec. 31, 2022
BGC Holdings, L.P.
Share-based Compensation Arrangement by Share-based Payment Award
Notional value	$ 151,951	$ 144,045
Estimated fair value of the post-termination payout	$ 46,657	$ 42,706
Outstanding limited partnership units (in shares)	44,928	44,928
NEWMARK Group Inc Parent
Share-based Compensation Arrangement by Share-based Payment Award
Outstanding limited partnership units (in shares)	15,284,618	14,277,213
Outstanding limited partnership units - unvested (in dollars per share)	1,477,145	2,155,668

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- Definition

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

+ References

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options outstanding grant date fair value.

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- Definition

The number of limited partner units outstanding.

+ References

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 https://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
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-Paragraph 2
-Subparagraph (c)(2)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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