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Compensation - Grant of Conversion Rights to Newmark Employees (Details) - Limited Partnership Units - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award |  |
Notional value | $ 209,528 | $ 218,520
Estimated fair value of limited partnership units | $ 192,539 | $ 208,029

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- Definition Notional Value Of Limited Partnership Units Eligible For Conversion + References No definition available. + Details
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Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options outstanding grant date fair value. + References No definition available. + Details
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Namespace Prefix: | nmrk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
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