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Compensation - Compensation Expense Related to Issuance of Common Stock and Grants of Exchangeability (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Share-Based Payment Arrangement [Abstract] |  |
Issuance of common stock and exchangeability expenses | $ 36,106 | $ 24,583

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- Definition Common Stock, Exchangeability Granted, Issued, Expense + References No definition available. + Details
Name: | nmrk_CommonStockExchangeabilityGrantedIssuedExpense
Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration