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Compensation - Compensation Expense Related to Issuance of Common Stock and Grants of Exchangeability (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Share-Based Payment Arrangement [Abstract] |  |  |  |
Issuance of common stock and exchangeability expenses | $ 11,852 | $ 5,832 | $ 47,958 | $ 27,705

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

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