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Related Party Transactions - Newmark Spin-Off (Details) - shares |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2018 | Dec. 31, 2024 | Dec. 31, 2023
Class B Common Stock |  |  |
Related Party Transaction [Line Items] |  |  |
Common stock, shares issued (in shares) |  | 109,452,953 | 109,452,953
Class A Common Stock |  |  |
Related Party Transaction [Line Items] |  |  |
Common stock, shares issued (in shares) |  | 424,361,066 | 403,574,835
Class A Common Stock | Newmark |  |  |
Related Party Transaction [Line Items] |  |  |
Limited partnership interests exchange ratio |  | 92.79% |
Newmark | Related Party | Class B Common Stock |  |  |
Related Party Transaction [Line Items] |  |  |
Common stock, shares issued (in shares) | 400,000 |  |
LPUs | Newmark |  |  |
Related Party Transaction [Line Items] |  |  |
Aggregate exchangeable limited partnership units purchased (in shares) | 1,500,000 |  |

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