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Compensation - Narrative (Details) |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 18, 2024 shares | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) shares | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) shares | Feb. 18, 2025 | Oct. 23, 2024 | Oct. 17, 2024 shares | Sep. 23, 2024 | Dec. 13, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |
Limited partnership units exchange ratio |  | 0.4545 |  | 0.4545 |  | 0.9279 | 0.9257 |  | 0.9248 |
Compensation expense (benefit) | $ |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |
Common stock, conversion for each restricted stock unit settled (in shares) |  |  |  | 1 |  |  |  |  |  |
Non Distribution Earning Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |
Unit granted during period (in shares) |  | 3,100,000 | 2,600,000 | 8,700,000 | 8,600,000 |  |  |  |  |
Number of shares vested and converted (in shares) |  | 2,000,000.0 | 2,700,000 | 6,000,000.0 | 7,800,000 |  |  |  |  |
Newmark Holdings, L.P. |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |
Limited partnership units exchange ratio |  | 0.4545 |  | 0.4545 |  |  |  |  |  |
Newmark Holdings Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |
Compensation expense (benefit) | $ |  | $ 68,838,000 | $ 43,523,000 | $ 200,755,000 | $ 119,675,000 |  |  |  |  |
Newmark Holdings Units | Restricted Stock Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  | 62,700,000 |  | $ 62,700,000 |  |  |  |  |  |
Cost not yet recognized, period for recognition |  |  |  | 4 years |  |  |  |  |  |
Compensation expense (benefit) | $ |  | $ 7,900,000 |  | $ 7,900,000 |  |  |  |  |  |
Earnings per share, decrease, basic (in dollars per share) | $ / shares |  | $ 0.02 |  | $ 0.02 |  |  |  |  |  |
Earnings per share, decrease, diluted (in dollars per share) | $ / shares |  | $ 0.02 |  | $ 0.02 |  |  |  |  |  |
Newmark Holdings Units | Limited Partnership Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  | 7 years |  |  |  |  |  |
Shares purchased for award (in shares) |  |  |  | 4,400,000 |  |  |  |  |  |
Fair value of non-vested | $ |  | $ 66,000,000.0 |  | $ 66,000,000.0 |  |  |  |  |  |
Unrecognized compensation expense | $ |  | $ 14,400,000 |  | $ 14,400,000 |  |  |  |  |  |
Cost not yet recognized, period for recognition |  |  |  | 1 year 3 months |  |  |  |  |  |
Newmark Holdings Units | Non Distribution Earning Units | Limited Partnership Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |
Shares purchased for award (in shares) |  |  |  | 2,800,000 |  |  |  |  |  |
Maximum | Newmark Holdings, L.P. | Restricted Stock Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  | 9 years |  |  |  |  |  |
Maximum | Newmark Holdings Units | Limited Partnership Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  | 7 years |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |
Limited partnership units exchange ratio |  |  |  |  |  |  |  |  |  | 1
Class A Common Stock | Newmark Holdings Units |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |
Limited partnership units exchange ratio |  | 0.9258 |  | 0.9258 |  |  |  |  |  |
Newmark Equity Plan | Class A Common Stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |  |
Shares authorized to be delivered pursuant to awards granted (in shares) |  |  |  |  |  |  |  | 500,000,000 |  | 400,000,000
Additional share authorized (in shares) | 100,000,000 |  |  |  |  |  |  |  |  |
Shares registered to be delivered pursuant to awards granted (in shares) |  | 500,000,000 |  | 500,000,000 |  |  |  |  |  |
Shares purchased for award (in shares) |  |  |  | 123,200,000 |  |  |  |  |  |
Shares available for future awards (in shares) |  | 376,800,000 |  | 376,800,000 |  |  |  |  |  |

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