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Related Party Transactions - Newmark Spin-off (Details) - shares |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2018 | Dec. 31, 2022 | Dec. 31, 2021
Class B Common Stock |  |  |
Related Party Transaction [Line Items] |  |  |
Common stock, shares issued (in shares) |  | 45,884,000 | 45,884,000
Class A Common Stock |  |  |
Related Party Transaction [Line Items] |  |  |
Common stock, shares issued (in shares) |  | 471,934,000 | 435,944,000
Class A Common Stock | Newmark |  |  |
Related Party Transaction [Line Items] |  |  |
Limited partnership interests exchange ratio |  | 93.03% |
Newmark | Cantor | 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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