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Related Party Transactions - Transactions with Executive Officers and Directors (Barry Gosin) (Details) | Dec. 31, 2023 shares | Apr. 01, 2023 shares | Mar. 30, 2023 USD ($) shares | Feb. 10, 2023 USD ($) tranche installment $ / shares shares
--- | --- | --- | --- | ---
Related Party Transaction |  |  |  |
Class of warrant or right, exchange rate | 14.29% |  |  |
Mr. Gosin |  |  |  |
Related Party Transaction |  |  |  |
Class of warrant or right, conversion ratio |  | 0.9252 |  |
Annual cash bonus | $ |  |  |  | $ 1,500,000
Mr. Gosin | Class A Common Stock |  |  |  |
Related Party Transaction |  |  |  |
Issuance of Class A common stock for Newmark RSUs (in shares) |  |  | 189,024 |
Class of warrant or right, redeemed | $ |  |  | $ 3,125,001 |
Newmark Holdings NPSUs | Mr. Gosin |  |  |  |
Related Party Transaction |  |  |  |
Class of warrant or right, rights converted (in shares) | 1,145,494 | 1,145,494 |  |
Number of tranches | tranche |  |  |  | 4
Class of warrant or right, advance award (in shares) |  |  |  | 1,145,475
Related party transaction, upfront advance award, base for calculating number of grants in period | $ |  |  |  | $ 10,000,000
Share price (in dollars per share) | $ / shares |  |  |  | $ 8.73
Conversion percentage |  |  |  | 25.00%
Number of installments | installment |  |  |  | 3
Conversion percentage, tranche one |  |  |  | 25.00%
Conversion percentage, tranche two |  |  |  | 25.00%
Conversion percentage, tranche three |  |  |  | 25.00%
Conversion percentage, tranche four |  |  |  | 25.00%
Minimum gross revenue threshold | $ |  |  |  | $ 10,000,000
Newmark Holdings PSU | Mr. Gosin |  |  |  |
Related Party Transaction |  |  |  |
Class of warrant or right, issued upon conversion (in shares) | 1,240,901 | 1,237,644 |  |
PSU conversion ratio | 0.9231 |  |  |
Exchangeable Newmark Holdings PSUs | Mr. Gosin |  |  |  |
Related Party Transaction |  |  |  |
Warrants and rights outstanding (in shares) |  | 176,804 |  |
Non-Exchangeable Newmark Holdings PSUs | Mr. Gosin |  |  |  |
Related Party Transaction |  |  |  |
Class of warrant or right, conversion ratio |  |  | 0.9303 |
Class of warrant or right, rights exercised (in shares) |  |  | 203,186 |

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