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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
	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

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No definition available.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options outstanding grant date fair value.

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No definition available.

+ Details

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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.

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No definition available.

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- Details

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