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Compensation - Schedule of Grant of Conversion Rights to Newmark Employees (Details) - Limited Partnership Units - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award |  |
Notional Value | $ 512 | $ 512
Estimated fair value of limited partnership units | $ 261 | $ 261

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