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Compensation - Activity Associated with Restricted Stock Units (Details) - Restricted Stock Units - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Newmark Holdings, L.P. |  |  |  |
Restricted Stock Units |  |  |  |
Beginning balance (in shares) |  | 11,263,862 | 10,721,457 |
Number of units, Issued (in shares) |  | 720,242 | 3,350,516 |
Number of Settled units (delivered shares) (in shares) |  | (1,227,539) | (2,464,570) |
Number of units, Forfeited units (in shares) |  | (128,004) | (343,541) |
Ending balance (in shares) |  | 10,628,561 | 11,263,862 | 10,721,457
Weighted- Average Grant Date Fair Value Per Share |  |  |  |
Balance at the beginning of period (in dollars per share) |  | $ 9.39 | $ 8.30 |
Granted (in dollars per share) |  | 6.95 | 12.15 |
Settled units (delivered shares) (in dollars per share) |  | 9.65 | 8.33 |
Forfeited units (in dollars per share) |  | 10.53 | 10.11 |
Balance at the end of period (in dollars per share) |  | $ 9.18 | $ 9.39 | $ 8.30
Fair Value Amount |  |  |  |
Balance at beginning of period |  | $ 105,735 | $ 89,025 |
Granted |  | 5,008 | 40,710 |
Settled units (delivered shares) |  | (12,325) | (20,526) |
Forfeited units |  | (1,347) | (3,474) |
Balance at end of period |  | $ 97,071 | $ 105,735 | $ 89,025
Weighted- Average Remaining Contractual Term (Years) |  | 4 years 10 months 2 days | 4 years 9 months | 4 years 11 months 15 days
Newmark Holdings, L.P. | Minimum |  |  |  |
Fair Value Amount |  |  |  |
Award vesting period | 2 years |  |  |
Newmark Holdings, L.P. | Maximum |  |  |  |
Fair Value Amount |  |  |  |
Award vesting period | 9 years |  |  |
BGC Holdings, L.P. |  |  |  |
Restricted Stock Units |  |  |  |
Beginning balance (in shares) |  | 6,928 | 5,375 |
Number of units, Issued (in shares) |  | 0 | 4,191 |
Number of Settled units (delivered shares) (in shares) |  | 0 | (2,638) |
Number of units, Forfeited units (in shares) |  | 0 | 0 |
Ending balance (in shares) |  | 6,928 | 6,928 | 5,375
Weighted- Average Grant Date Fair Value Per Share |  |  |  |
Balance at the beginning of period (in dollars per share) |  | $ 4.17 | $ 3.85 |
Granted (in dollars per share) |  | 0 | 4.28 |
Settled units (delivered shares) (in dollars per share) |  | 0 | 3.69 |
Forfeited units (in dollars per share) |  | 0 | 0 |
Balance at the end of period (in dollars per share) |  | $ 4.17 | $ 4.17 | $ 3.85
Fair Value Amount |  |  |  |
Balance at beginning of period |  | $ 29 | $ 21 |
Granted |  | 0 | 18 |
Settled units (delivered shares) |  | 0 | (10) |
Forfeited units |  | 0 | 0 |
Balance at end of period |  | $ 29 | $ 29 | $ 21
Weighted- Average Remaining Contractual Term (Years) |  | 1 year 7 months 13 days | 1 year 7 months 13 days | 1 year 1 month 28 days
BGC Holdings, L.P. | Minimum |  |  |  |
Fair Value Amount |  |  |  |
Award vesting period |  | 2 years |  |
BGC Holdings, L.P. | Maximum |  |  |  |
Fair Value Amount |  |  |  |
Award vesting period |  | 4 years |  |

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