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Related Party Transactions - Transactions with Executive Officers and Directors (Howard & Brandon Lutnick) (Details) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
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May 19, 2025 shares | May 16, 2025 $ / shares shares | Feb. 05, 2025 $ / shares shares | Jan. 13, 2025 $ / shares shares | Sep. 23, 2024 $ / shares shares | Jan. 02, 2024 USD ($) shares | Dec. 27, 2021 USD ($) | Sep. 30, 2025 $ / shares shares | Aug. 31, 2025 $ / shares shares | Sep. 30, 2025 shares | Jun. 30, 2025 $ / shares shares | Sep. 30, 2024 $ / shares shares | Sep. 30, 2025 $ / shares shares | Sep. 30, 2024 $ / shares shares | Jan. 02, 2025 shares | Oct. 23, 2024 USD ($) shares
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares |  |  | $ 14.14 | $ 11.93 | $ 15.34 |  |  |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) |  |  |  |  | 795,376 |  |  |  |  |  |  |  |  |  |  |
Related party transaction, award payment term |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock repurchases (in shares) |  |  |  |  |  |  |  | 0 | 0 | 0 | 10,839,674 | 6,779,828 | 10,839,674 | 15,745,930 |  |
Shares repurchased price (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 0 | $ 0 |  | $ 11.58 | $ 13.21 | $ 11.58 | $ 11.56 |  |
Stock repurchased, gross (in shares) |  |  | 2,653,272 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld for tax withholding obligation (in shares) |  |  |  | 232,380 |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased (in shares) |  |  | 1,309,367 | 186,732 |  |  |  |  |  |  |  |  |  |  |  |
Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased price (in dollars per share) | $ / shares |  | $ 11.58 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment | $ |  |  |  |  |  | $ 1,250,000 |  |  |  |  |  |  |  |  |  |
Mr. Lutnick | Rights for Previously Non-Exchangeable PSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding (in shares) |  |  | 1,148,970 |  |  | 617,262 |  |  |  |  |  |  |  |  | 101,133 | 712,347
Class of warrant or right, number of securities called by warrants or rights (in shares) |  |  | 1,148,970 |  |  | 617,262 |  |  |  |  |  |  |  |  | 101,133 | 712,347
Class of warrant or right, issued upon conversion (in shares) |  |  | 2,859,437 |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, conversion ratio |  |  | 0.9279 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, gross (in shares) |  |  |  | 419,112 |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld for tax withholding obligation (in shares) |  |  | 1,343,905 |  |  |  |  |  |  |  |  |  |  |  |  |
Mr. Lutnick | Rights for Monetization of Previously Awarded Nonexchangeable PPSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants and rights outstanding (in shares) |  |  |  |  |  | 81,275 |  |  |  |  |  |  |  |  |  | 81,275
Class of warrant or right, cash payment called by warrants or rights | $ |  |  |  |  |  | $ 1,250,000 |  |  |  |  |  |  |  |  |  | $ 1,250,000
Mr. Lutnick | Non-Exchangeable Rights for Newmark Holdings PSUs/NPSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, waived (in shares) |  |  |  |  |  | 617,262 |  |  |  |  |  |  |  |  |  |
Mr. Lutnick | Non-Exchangeable Rights for Newmark Holdings PPSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, waived (in shares) |  |  |  |  |  | 81,275 |  |  |  |  |  |  |  |  |  |
Mr. Lutnick | Sale of Class A Common Stock to Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock repurchases (in shares) |  | 10,969,533 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased price (in dollars per share) | $ / shares |  | $ 11.58 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mr. Lutnick | Sale of Class A Common Stock to Company | Howard W. Lutnick, Spouse and Trusts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock repurchases (in shares) | 10,839,674 | 129,859 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mr. Lutnick | Sale of Class A Common Stock to Company | Mr. Lutnick |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock repurchases (in shares) |  | 7,989,936 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mr. Lutnick | Sale of Class A Common Stock to Company | Personal Asset Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock repurchases (in shares) |  | 2,843,781 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mr. Lutnick | Sale of Class A Common Stock to Company | Family Trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock repurchases (in shares) |  | 3,384 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mr. Lutnick | Sale of Class A Common Stock to Company | Spouse |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock repurchases (in shares) |  | 2,573 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mr. Lutnick | Retention Bonus Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash payments | $ |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Mr. Lutnick | Retention Bonus Agreement, Payment Within Three Days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash payments | $ |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |  |
Mr. Lutnick | Retention Bonus Agreement, Payment Within Thirty Days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate cash payments | $ |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |

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