Compensation - Schedule of Expense Related to Newmark and BGC RSUs (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Newmark Holdings Units \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
RSU amortization	$ 7,742	$ 14,017	$ 17,296	$ 26,365

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