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v3.23.1

Financial Guarantee Liability - Summary of Changes on Estimated Liability Under Guarantee Liability (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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

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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://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
Name: | us-gaap_GuarantyLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant