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Compensation - Summary of Activity of Number of Share Equivalent Limited Partnership Units and Post IPO Grants (Detail) - Newmark Holdings, L.P. [Member] - Share Equivalent Limited Partnership Units [Member] - shares	6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Units, Balance outstanding at beginning of period	44,733,487	29,413,143	29,413,143
Number of Units, Granted	10,746,929		19,141,943
Number of Units, Redeemed/exchanged units	(880,960)		(3,793,351)
Number of Units, Forfeited units			(28,248)
Number of Units, Forfeited units/Other units	4,846,170
Number of Units, Balance outstanding at end of period	59,445,626	44,700,000	44,733,487

X

- 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.

+ Details

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- Definition

Share-based compensation arrangement by share-based payment award non option equity instruments forfeitures and other.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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=109197908&loc=d3e5070-113901

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(1)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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

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-Publisher FASB
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-Paragraph 2
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