Compensation - Schedule of Compensation Expense Related to Limited Partnership Units that were Not Redeemed (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Limited Partnership Units \| Newmark Holdings Units
Share-based Compensation Arrangement by Share-based Payment Award
Limited partnership units amortization	$ 5,679	$ 6,782	$ 3,356	$ 16,321

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