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Compensation - Additional Information (Detail) |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Mar. 31, 2021 USD ($) shares | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 shares | Dec. 13, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Shares available for future awards (in shares) |  | 364,400,000 |  |  |  |
Number of shares vested and converted (in shares) |  | 600,000 |  |  |  |
Unrecognized compensation expense related to unvested RSUs | $ |  | $ 78,000,000.0 |  |  |  |
Deferred cash compensation expense recognized | $ |  | 35,000 | $ 131,000 |  |  |
Liability for deferred cash compensation awards | $ |  | $ 0 |  | $ 900,000 |  |
Executives And Non Executives Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Limited partners capital account units held by BGC (in shares) |  | 35,600,000 |  |  |  |
Newmark Holdings, L.P. |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Limited partnership units exchange ratio (in percentage) |  | 0.4545 |  |  |  |
Newmark Holdings, L.P. | Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Limited partnership units outstanding (in shares) |  | 10,032,936 |  | 10,646,797 | 4,683,571 |
BGC Holdings, L.P. |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Limited partnership units outstanding (in shares) |  | 51,743,305 |  | 54,422,002 | 56,053,701 |
BGC Holdings, L.P. | Limited Partnership Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Limited partnership units outstanding (in shares) |  | 8,400,000 |  | 9,100,000 |  |
Exchangeable partnership units (in shares) |  | 3,700,000 |  | 4,500,000 |  |
NEWMARK Group Inc Parent |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Limited partners capital account units held by BGC (in shares) |  | 20,375,058 |  | 20,184,716 |  |
Limited partnership units outstanding (in shares) |  | 64,132,911 |  | 66,626,185 | 60,800,852 |
NEWMARK Group Inc Parent | Limited Partnership Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Limited partnership units outstanding (in shares) |  | 4,800,000 |  | 5,300,000 |  |
Exchangeable partnership units (in shares) |  | 1,600,000 |  | 2,000,000.0 |  |
Maximum | Newmark Holdings, L.P. | Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Award vesting period (in years) | 8 years |  |  |  |  |
Maximum | NEWMARK Group Inc Parent | Limited Partnership Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Award vesting period (in years) |  | 7 years |  |  |  |
Minimum | Newmark Holdings, L.P. | Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Award vesting period (in years) | 2 years |  |  |  |  |
Minimum | NEWMARK Group Inc Parent | Limited Partnership Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Award vesting period (in years) |  | 3 years |  |  |  |
Common Class A |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Limited partnership units exchange ratio (in percentage) |  |  |  |  |  | 1
Common Class A | NEWMARK Group Inc Parent |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Limited partnership units exchange ratio (in percentage) |  | 0.9365 |  |  |  |
Newmark Equity Plan | Common Class A | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Shares authorized to be delivered pursuant to awards granted (in shares) |  |  |  |  |  | 400,000,000.0
Shares registered to be delivered pursuant to awards granted (in shares) |  |  |  |  |  | 65,000,000.0
Non Distribution Earning Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |  |
Award vesting period (in years) |  | 4 years |  |  |  |
Unit granted during period (in shares) |  | 1,300,000 |  |  |  |

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