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Related Party Transactions - Cantor Rights to Purchase Cantor Units from Newmark Holdings (Details) | Jun. 30, 2023 USD ($) shares | Apr. 16, 2023 USD ($) shares | Jun. 30, 2024 shares | Nov. 06, 2018 | Dec. 13, 2017
--- | --- | --- | --- | --- | ---
Related Party Transaction |  |  |  |  |
Limited partnership units exchange ratio |  |  | 0.4545 |  |
Related Party | Founding Partner Exchange Units |  |  |  |  |
Related Party Transaction |  |  |  |  |
Warrants and rights outstanding (in shares) |  |  | 297,183 |  |
Founding partner interest | Related Party |  |  |  |  |
Related Party Transaction |  |  |  |  |
Issuance of Class A common stock for Newmark RSUs (in shares) | 74,026 | 309,631 |  |  |
Proceeds from the sale of limited partnership interests | $ | $ 310,976 | $ 1,282,265 |  |  |
Limited partner interest | Related Party |  |  |  |  |
Related Party Transaction |  |  |  |  |
Issuance of Class A common stock for Newmark RSUs (in shares) |  | 38,989 |  |  |
Proceeds from the sale of limited partnership interests | $ |  | $ 166,364 |  |  |
Common Stock |  |  |  |  |
Related Party Transaction |  |  |  |  |
Limited partnership units exchange ratio |  |  |  | 1 |
Class A Common Stock |  |  |  |  |
Related Party Transaction |  |  |  |  |
Limited partnership units exchange ratio |  |  |  |  | 1
Class A Common Stock | NEWMARK Group Inc |  |  |  |  |
Related Party Transaction |  |  |  |  |
Limited partnership units exchange ratio |  |  | 0.9248 |  |

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