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Compensation - Activity Associated with Restricted Stock Units (Details) - Restricted Stock Units (RSUs) - USD ($) $ / shares in Units, $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Newmark Holdings, L.P. |  |  |  |
Restricted Stock Units |  |  |  |
Beginning balance (in shares) |  | 10,646,797 | 4,683,571 |
Number of units, Issued (in shares) |  | 2,131,653 | 7,337,460 |
Number of Settled units (delivered shares) (in shares) |  | (1,506,037) | (1,151,507) |
Number of units, Forfeited units (in shares) |  | (245,114) | (222,727) |
Ending balance (in shares) |  | 11,027,299 | 10,646,797 | 4,683,571
Weighted- Average Grant Date Fair Value Per Share |  |  |  |
Balance at the beginning of period (in dollars per share) |  | $ 7.75 | $ 7.55 |
Granted (in dollars per share) |  | 8.70 | 7.96 |
Settled units (delivered shares) (in dollars per share) |  | 7.69 | 8.29 |
Forfeited units (in dollars per share) |  | 5.92 | 7.78 |
Balance at the end of period (in dollars per share) |  | $ 7.98 | $ 7.75 | $ 7.55
Fair Value Amount |  |  |  |
Balance at beginning of period |  | $ 82,494 | $ 35,361 |
Granted |  | 18,549 | 58,415 |
Settled units (delivered shares) |  | (11,584) | (9,549) |
Forfeited units |  | (1,451) | (1,733) |
Balance at end of period |  | $ 88,008 | $ 82,494 | $ 35,361
Weighted- Average Remaining Contractual Term (Years) |  | 5 years 5 months 15 days | 5 years 8 months 8 days | 5 years 8 months 8 days
Newmark Holdings, L.P. | Minimum |  |  |  |
Fair Value Amount |  |  |  |
Award vesting period (in years) | 2 years |  |  |
Newmark Holdings, L.P. | Maximum |  |  |  |
Fair Value Amount |  |  |  |
Award vesting period (in years) | 8 years |  |  |
BGC Holdings, L.P. |  |  |  |
Restricted Stock Units |  |  |  |
Beginning balance (in shares) |  | 8,013 | 46,807 |
Number of units, Issued (in shares) |  | 0 | 7,912 |
Number of Settled units (delivered shares) (in shares) |  | (2,638) | (45,544) |
Number of units, Forfeited units (in shares) |  | 0 | (1,162) |
Ending balance (in shares) |  | 5,375 | 8,013 | 46,807
Weighted- Average Grant Date Fair Value Per Share |  |  |  |
Balance at the beginning of period (in dollars per share) |  | $ 3.80 | $ 9.97 |
Granted (in dollars per share) |  | 0 | 3.69 |
Settled units (delivered shares) (in dollars per share) |  | 3.69 | 9.95 |
Forfeited units (in dollars per share) |  | 0 | 10.64 |
Balance at the end of period (in dollars per share) |  | $ 3.85 | $ 3.80 | $ 9.97
Fair Value Amount |  |  |  |
Balance at beginning of period |  | $ 31 | $ 467 |
Granted |  | 0 | 29 |
Settled units (delivered shares) |  | (10) | (453) |
Forfeited units |  | 0 | (12) |
Balance at end of period |  | $ 21 | $ 31 | $ 467
Weighted- Average Remaining Contractual Term (Years) |  | 1 year 7 months 28 days | 2 years 2 months 1 day | 3 months
BGC Holdings, L.P. | Minimum |  |  |  |
Fair Value Amount |  |  |  |
Award vesting period (in years) |  | 2 years |  |
BGC Holdings, L.P. | Maximum |  |  |  |
Fair Value Amount |  |  |  |
Award vesting period (in years) |  | 4 years |  |

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