Compensation - Compensation Expense Related to Limited Partnership Units that were Not Redeemed (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Newmark Holdings Units \| Limited Partnership Units
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units amortization	$ 23,203	$ 14,267	$ 8,322

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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+ Details