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Compensation - Narrative (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) shares | Mar. 31, 2023 USD ($) shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 shares | Dec. 13, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Limited partnership units exchange ratio | 0.4545 |  |  |  |
Unrecognized compensation expense | $ | $ 68,700,000 |  |  |  |
Compensation expense (benefit) | $ | $ 51,212,000 | $ 35,407,000 |  |  |
Common stock, conversion for each restricted stock unit settled | 1 |  |  |  |
Limited Partnership Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Compensation expense (benefit) | $ | $ 0 | $ 0 |  |  |
Non Distribution Earning Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Award vesting period | 7 years |  |  |  |
Unit granted during period (in shares) | 1,200,000 | 1,100,000 |  |  |
Number of shares vested and converted (in shares) | 2,500,000 | 2,500,000 |  |  |
Newmark Holdings, L.P. |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Limited partnership units exchange ratio | 0.4545 |  |  |  |
NEWMARK Group Inc |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Limited partnership units outstanding (in shares) | 46,233,230 |  | 42,376,966 | 30,687,954 |
NEWMARK Group Inc | Limited Partnership Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Limited partnership units outstanding (in shares) | 3,000,000 |  | 3,100,000 |  |
Exchangeable partnership units (in shares) | 1,400,000 |  | 1,500,000 |  |
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 |  | $ 46,000,000 |  |
Unrecognized compensation expense | $ | $ 28,500,000 |  |  |  |
Cost not yet recognized, period for recognition | 1 year 9 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 |  |
BGC Holdings, L.P. |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Limited partnership units outstanding (in shares) | 0 |  | 0 | 5,459,388 |
BGC Holdings, L.P. | Limited Partnership Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Limited partnership units outstanding (in shares) | 0 |  |  |  |
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 | 0.9255 |  |  |  |
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 |  |  |  |
Shares purchased for award (in shares) | 100,100,000 |  |  |  |
Shares available for future awards (in shares) | 299,900,000 |  |  |  |

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