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Compensation - Schedule of Expense Related to Newmark and BGC RSUs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Newmark Holdings Units | Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award      
RSU amortization $ 51,084 $ 29,568 $ 24,620