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Stock Transactions and Unit Redemptions - Schedule of Changes in Shares of Common Stock Outstanding (Details) - shares | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Share issuances: |  |
Other (in shares) | (155,240) | 13,521
Class A Common Stock |  |
Increase (Decrease) in Stockholders' Equity |  |
Shares outstanding at beginning of period (in shares) | 150,384,605 | 168,272,371
Share issuances: |  |
LPU redemption/exchange (in shares) | 1,927,905 | 934,868
Treasury stock repurchases (in shares) | 0 | (1,682,871)
Shares outstanding at end of period (in shares) | 153,142,810 | 168,557,363
Class A Common Stock | Restricted Stock Units |  |
Share issuances: |  |
Issuance of Class A common stock for Newmark RSUs (in shares) | 985,540 | 1,019,474

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