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Compensation - Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($) shares | Jun. 30, 2024 USD ($) shares | Jun. 30, 2023 USD ($) shares | Dec. 31, 2023 USD ($) shares | Dec. 13, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Limited partnership units exchange ratio | 0.4545 |  | 0.4545 |  |  |
Unrecognized compensation expense | $ | $ 74,500,000 |  | $ 74,500,000 |  |  |
Compensation expense (benefit) | $ | 24,941,000 | $ 19,487,000 | $ 76,153,000 | $ 54,894,000 |  |
Common stock, conversion for each restricted stock unit settled (in shares) |  |  | 1 |  |  |
Limited Partnership Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Compensation expense (benefit) | $ | $ 0 | $ 0 | $ 0 | $ 0 |  |
Non Distribution Earning Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Unit granted during period (in shares) | 800,000 | 1,000,000.0 | 2,000,000 | 2,000,000 |  |
Number of shares vested and converted (in shares) | 2,600,000 | 3,800,000 | 5,100,000 | 6,300,000 |  |
Newmark Holdings, L.P. |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Limited partnership units exchange ratio | 0.4545 |  | 0.4545 |  |  |
NEWMARK Group Inc | Limited Partnership Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Award vesting period |  |  | 7 years |  |  |
Shares purchased for award (in shares) |  |  | 3,200,000 |  |  |
Fair value of non-vested | $ | $ 46,000,000.0 |  | $ 46,000,000.0 |  | $ 46,000,000.0 |
Unrecognized compensation expense | $ | $ 24,400,000 |  | $ 24,400,000 |  |  |
Cost not yet recognized, period for recognition |  |  | 1 year 6 months |  |  |
NEWMARK Group Inc | Non Distribution Earning Units | Limited Partnership Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Shares purchased for award (in shares) |  |  | 2,300,000 |  | 2,300,000 |
Maximum | NEWMARK Group Inc | 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 Group Inc |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Limited partnership units exchange ratio | 0.9248 |  | 0.9248 |  |  |
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) |  |  |  |  |  | 400,000,000
Shares registered to be delivered pursuant to awards granted (in shares) | 400,000,000 |  | 400,000,000 |  |  |
Shares purchased for award (in shares) |  |  | 102,400,000 |  |  |
Shares available for future awards (in shares) | 297,600,000 |  | 297,600,000 |  |  |

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