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Stock Transactions and Unit Purchases - Schedule of Changes in Shares of Common Stock Outstanding (Details) - Class A Common Stock - shares | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Aug. 31, 2025 | Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Shares outstanding at beginning of period (in shares) |  |  | 154,352,509 |  | 150,384,929 | 149,506,832 | 152,639,359
Share issuances: |  |  |  |  |  |  |
LPU redemption/exchange (in shares) |  |  | 2,675,722 |  | 2,969,977 | 15,726,341 | 8,137,918
Other (in shares) |  |  | 0 |  | (26,879) | 463,207 | 74,513
Treasury stock repurchases (in shares) | 0 | 0 | 0 | (10,839,674) | (6,779,828) | (10,839,674) | (15,745,930)
Shares outstanding at end of period (in shares) | 157,491,836 |  | 157,491,836 | 154,352,509 | 146,962,810 | 157,491,836 | 146,962,810
Restricted Stock Units |  |  |  |  |  |  |
Share issuances: |  |  |  |  |  |  |
Issuance of Class A common stock for Newmark RSUs (in shares) |  |  | 463,605 |  | 414,611 | 2,635,130 | 1,856,950

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