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Compensation - Activity Associated with Limited Partnership Units (Detail) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
NEWMARK Group Inc Parent
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding
Beginning balance (in shares)	66,626,185	60,800,852
Number of Units, Issued (in shares)	1,115,181	12,569,298
Number of units, Redeemed/exchanged units (in shares)	(3,450,288)	(6,660,984)
Number of Units, Forfeited units (in shares)	(158,167)	(82,981)
Ending balance (in shares)	64,132,911	66,626,185
Exchangeable Units (units)	9,464,391	9,906,763
BGC Holdings, L.P.
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding
Beginning balance (in shares)	54,422,002	56,053,701
Number of Units, Issued (in shares)	159,057	1,071,612
Number of units, Redeemed/exchanged units (in shares)	(1,989,419)	(2,657,901)
Number of Units, Forfeited units (in shares)	(848,335)	(45,410)
Ending balance (in shares)	51,743,305	54,422,002
Exchangeable Units (units)	23,387,428	24,863,107
Regular units | NEWMARK Group Inc Parent
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding
Ending balance (in shares)	59,897,905
Regular units | BGC Holdings, L.P.
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding
Ending balance (in shares)	50,291,393
Preferred Units | NEWMARK Group Inc Parent
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding
Ending balance (in shares)	4,235,006
Preferred Units | BGC Holdings, L.P.
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding
Ending balance (in shares)	1,451,912

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- Definition

Exchangeable Units

+ References

No definition available.

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- Definition

Number of exchangeable limited partnership units redeemed or exchanged into the Company's class A common stock during the period.

+ References

No definition available.

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- Definition

Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

+ References

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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Net number of non-option equity instruments granted to participants.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

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)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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