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Financial Guarantee Liability - Schedule of Changes on Estimated Liability Under Guarantee Liability (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Guaranty Liability: |  |  |
Beginning balance | $ 30,610 | $ 26,315 | $ 26,315
Provision for expected credit losses | 1,460 | $ 1,500 | 4,295
Ending balance | $ 32,070 |  | $ 30,610

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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 -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: 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 + Details
Name: | us-gaap_GuarantyLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant