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Compensation - Narrative (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 18, 2024 shares | Dec. 31, 2025 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 USD ($) 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 |  |  | 0.9279 | 0.9257 |  | 0.9248 |
Compensation expense (benefit) | $ |  | $ 0 | $ (700) | $ 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) |  | 10,600,000 | 12,300,000 | 24,300,000 |  |  |  |  |
Number of shares vested and converted (in shares) |  | 7,900,000 | 10,400,000 | 11,600,000 |  |  |  |  |
Newmark Holdings, L.P. |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Limited partnership units exchange ratio |  | 0.4545 |  |  |  |  |  |  |
Newmark Holdings Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Compensation expense (benefit) | $ |  | $ 251,188 | $ 163,744 | $ 124,805 |  |  |  |  |
Newmark Holdings Units | Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  | $ 59,700 |  |  |  |  |  |  |
Cost not yet recognized, period for recognition |  | 4 years |  |  |  |  |  |  |
Compensation expense (benefit) | $ |  | $ 7,900 |  |  |  |  |  |  |
Earnings per share, decrease, basic (in dollars per share) | $ / shares |  | $ 0.02 |  |  |  |  |  |  |
Earnings per share, decrease, diluted (in dollars per share) | $ / shares |  | $ 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) |  | 4,600,000 |  |  |  |  |  |  |
Fair value of non-vested | $ |  | $ 22,300 |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  | $ 10,100 |  |  |  |  |  |  |
Cost not yet recognized, period for recognition |  | 2 years 1 month 6 days |  |  |  |  |  |  |
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) |  | 3,000,000.0 |  |  |  |  |  |  |
Maximum | Newmark Holdings, L.P. | Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |  |  |  |
Award vesting period |  | 8 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 |  | 0.9264 |  |  |  |  |  |  |
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) |  |  |  |  |  |  | 500,000,000.0 |  | 400,000,000.0
Additional share authorized (in shares) | 100,000,000.0 |  |  |  |  |  |  |  |
Shares registered to be delivered pursuant to awards granted (in shares) |  | 500,000,000.0 |  |  |  |  |  |  |
Shares purchased for award (in shares) |  | 126,100,000 |  |  |  |  |  |  |
Shares available for future awards (in shares) |  | 373,900,000 |  |  |  |  |  |  |

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