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Related Party Transactions - Transactions with Executive Officers and Directors (Howard Lutnick) (Details) - USD ($) |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 02, 2024 | May 18, 2023 | Apr. 01, 2023 | Dec. 28, 2021 | Dec. 21, 2021 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Apr. 19, 2019 | Apr. 01, 2019
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Number of units redeemed (in shares) |  |  |  |  |  | 1,274,736 | 1,072,619 | 4,922,350 | 3,817,173 |  |
Issuance of common stock and exchangeability expenses |  |  |  |  |  | $ 11,852,000 | $ 5,832,000 | $ 47,958,000 | $ 27,705,000 |  |
Related party transaction, award payment term |  |  |  | 3 years |  |  |  |  |  |  |
BGC Holdings, L.P. |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Number of units redeemed (in shares) |  |  |  |  |  | 0 | 100,280 | 0 | 116,556 |  |
NEWMARK Group Inc |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Number of units redeemed (in shares) |  |  |  |  |  | 1,274,736 | 972,339 | 4,922,350 | 3,700,617 |  |
Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Cash payment | $ 1,250,000 |  |  |  |  |  |  |  |  |  |
Contingent gross revenue minimum |  |  |  |  |  |  |  |  |  | $ 5,000,000 |
Class of warrant or right, rights exercised (in shares) |  |  |  |  | 250,000 |  |  |  |  |  |
Howard W. Lutnick | Retention Bonus Agreement |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Aggregate cash payments |  |  |  | $ 50,000,000 |  |  |  |  |  |  |
Howard W. Lutnick | Retention Bonus Agreement, Payment Within Three Days |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Aggregate cash payments |  |  |  | 20,000,000 |  |  |  |  |  |  |
Howard W. Lutnick | Retention Bonus Agreement, Payment Within Thirty Days |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Aggregate cash payments |  |  |  | $ 10,000,000 |  |  |  |  |  |  |
Howard W. Lutnick | BGC Holdings, L.P. |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Number of units redeemed (in shares) |  | 1,474,930 |  |  |  |  |  |  |  |  |
Issuance of common stock and exchangeability expenses |  | $ 9,100,000 |  |  |  |  |  |  |  |  |
Howard W. Lutnick | NEWMARK Group Inc |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock and exchangeability expenses |  | $ 7,000,000 |  |  |  |  |  |  |  |  |
Rights for Previously Non-Exchangeable PSUs | Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding (in shares) | 617,262 |  |  |  |  |  |  |  |  |  |
Class of warrant or right, number of securities called by warrants or rights (in shares) | 617,262 |  |  |  |  |  |  |  |  |  |
Rights for Monetization of Previously Awarded Nonexchangeable PPSUs | Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding (in shares) | 81,275 |  |  |  |  |  |  |  |  |  |
Class of warrant or right, cash payment called by warrants or rights | $ 1,250,000 |  |  |  |  |  |  |  |  |  |
Non-Exchangeable Rights for Newmark Holdings PSUs/NPSUs | Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, waived (in shares) | 617,262 |  |  |  |  |  |  |  |  |  |
Non-Exchangeable Rights for Newmark Holdings PPSUs | Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, waived (in shares) | 81,274 |  |  |  |  |  |  |  |  |  |
Newmark Holdings NPSUs and NNPSUs | Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, exercise price of warrants or rights (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 10.05
Newmark Holdings NPSUs | Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 500,000
Class of warrant or right, number of securities called annually by warrants or rights (in shares) |  |  |  |  |  |  |  |  |  | 125,000 |
Class of warrant or right, rights exchanged (in shares) |  |  | 125,000 |  |  |  |  |  |  |  |
Newmark Holdings NPPSUs | Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 500,000
Class of warrant or right, number of securities called annually by warrants or rights (in shares) |  |  |  |  |  |  |  |  |  | 125,000 |
Non-Exchangeable Newmark Holdings PSUs | Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, number of securities called annually by warrants or rights (in shares) |  |  |  |  |  |  |  |  |  | 125,000 |
Class of warrant or right, rights exchanged (in shares) |  |  | 125,000 |  |  |  |  |  |  |  |
Non-Exchangeable Newmark Holdings PPSUs | Howard W. Lutnick |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, number of securities called annually by warrants or rights (in shares) |  |  |  |  |  |  |  |  |  | 125,000 |

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