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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, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Guaranty LIability: |  |  |
Beginning balance | $ 28,551 | $ 27,729 | $ 27,729
Provision for expected credit losses | 1,251 | $ 2,800 | 2,634
Credit loss settlement |  |  | (1,812)
Ending balance | $ 29,802 |  | $ 28,551

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- 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

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- 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

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- 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

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- 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://www.xbrl.org/2009/role/commonPracticeRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482050/460-10-25-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_GuarantyLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant