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Related Party Transactions - Transactions with Executive Officers and Directors (Barry Gosin) (Details) |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 05, 2025 $ / shares shares | Jan. 13, 2025 $ / shares shares | Sep. 23, 2024 $ / shares shares | Aug. 07, 2024 USD ($) shares | Feb. 10, 2023 USD ($) installment tranche $ / shares shares | Dec. 31, 2025 USD ($) shares | Dec. 31, 2024 $ / shares shares | Dec. 31, 2023 shares | Feb. 18, 2025 | Oct. 23, 2024 | Dec. 13, 2017
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) | shares |  |  | 795,376 |  |  |  | 68,346 | 0 |  |  |
Preferred stock, redemption price per share (in dollars per share) | $ / shares |  |  | $ 14.19 |  |  |  | $ 14.96 |  |  |  |
Share price (in dollars per share) | $ / shares | $ 14.14 | $ 11.93 | $ 15.34 |  |  |  |  |  |  |  |
Limited partnership units exchange ratio |  |  | 0.9248 |  |  | 0.4545 |  |  | 0.9279 | 0.9257 |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) | shares | 1,309,367 | 186,732 |  |  |  |  |  |  |  |  |
Limited partnership units exchange ratio |  |  |  |  |  |  |  |  |  |  | 1
APSUs |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) | shares |  |  | 123,336 |  |  |  |  |  |  |  |
PSUs |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) | shares |  |  | 611,167 |  |  |  |  |  |  |  |
SPUSs |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) | shares |  |  | 60,873 |  |  |  |  |  |  |  |
Mr. Gosin |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Related party transaction, termination notice, period |  |  |  | 6 months |  |  |  |  |  |  |
Related party transaction, one time cash payment |  |  |  | $ 5,000,000 |  |  |  |  |  |  |
Related party transaction, annual compensation |  |  |  | 17,500,000 |  |  |  |  |  |  |
Related party transaction, annual compensation, salary |  |  |  | 1,000,000 |  |  |  |  |  |  |
Related party transaction, annual compensation, cash-based and share-based awards |  |  |  | $ 16,500,000 |  |  |  |  |  |  |
Annual cash bonus |  |  |  |  | $ 1,500,000 |  |  |  |  |  |
Exchangeable Newmark Holdings PSUs | Mr. Gosin |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding (in shares) | shares |  |  |  |  |  |  | 354,076 |  |  |  |
Newmark Holdings NPSUs | Mr. Gosin |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  |  |  | $ 8.73 |  |  |  |  |  |
Number of conversion rights granted (in shares) | shares |  |  |  | 1,694,915 |  | 1,145,476 |  |  |  |  |
Conversion percentage |  |  |  |  | 25.00% | 25.00% |  |  |  |  |
Class of warrant or right percentage |  |  |  |  |  | 75.00% |  |  |  |  |
Minimum gross revenue threshold |  |  |  |  | $ 10,000,000 | $ 10,000,000 |  |  |  |  |
Class of warrant or right, rights exchanged (in shares) | shares |  |  |  |  |  | 1,238,620 |  |  |  |  |
Number of tranches | tranche |  |  |  |  | 4 |  |  |  |  |  |
Class of warrant or right, advance award (in shares) | shares |  |  |  |  | 1,145,476 |  |  |  |  |  |
Related party transaction, upfront advance award, base for calculating number of grants in period |  |  |  |  | $ 10,000,000 |  |  |  |  |  |
Conversion percentage, tranche one |  |  |  |  | 25.00% |  |  |  |  |  |
Number of installments | installment |  |  |  |  | 3 |  |  |  |  |  |
Conversion percentage, tranche four |  |  |  |  | 25.00% |  |  |  |  |  |
Conversion percentage, tranche three |  |  |  |  | 25.00% |  |  |  |  |  |
Conversion percentage, tranche two |  |  |  |  | 25.00% |  |  |  |  |  |
Newmark Holdings NPSUs | Mr. Gosin | Award Period One |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Share-based liabilities paid |  |  |  | $ 5,000,000 |  |  |  |  |  |  |
Newmark Holdings NPSUs | Mr. Gosin | Award Period Two |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Share-based liabilities paid |  |  |  | 15,000,000 |  |  |  |  |  |  |
Newmark Holdings NPSUs | Mr. Gosin | Award Period Three |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Share-based liabilities paid |  |  |  | $ 1,500,000 |  |  |  |  |  |  |

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