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Financial Guarantee Liability - Summary of Changes on Estimated Liability Under Guarantee Liability (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Guaranty LIability:
Beginning balance	$ 27,729	$ 25,989	$ 25,989
Provision for expected credit losses	2,803	$ 200	1,740
Credit loss settlement	(1,248)
Ending balance	$ 29,284		$ 27,729

X

- Definition

Guaranty Liabilities, Credit Loss Settlement

+ References

No definition available.

+ Details

Name:	nmrk_GuarantyLiabilitiesCreditLossSettlement
Namespace Prefix:	nmrk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Guaranty Liabilities [Roll Forward]

+ References

No definition available.

+ Details

Name:	nmrk_GuarantyLiabilitiesRollForward
Namespace Prefix:	nmrk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Provision for risk-sharing obligations.

+ References

No definition available.

+ Details

Name:	nmrk_ProvisionReversalForRiskSharingObligations
Namespace Prefix:	nmrk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15)
-URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15)
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 25
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=123422226&loc=d3e11019-110243

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 25
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=123422226&loc=d3e11049-110243

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant