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Related Party Transactions - Transactions with Executive Officers and Directors (Details) - USD ($) |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Jul. 30, 2025 | Jun. 10, 2025 | Mar. 04, 2025 | Feb. 05, 2025 | Oct. 08, 2024 | Oct. 07, 2024 | Aug. 08, 2024 | Jan. 02, 2024 | Sep. 30, 2025 | Aug. 31, 2025 | Jul. 31, 2025 | Sep. 30, 2024 | Aug. 31, 2024 | Jul. 31, 2024 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated vesting of restricted stock (in shares) |  |  |  | 1,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld to satisfy tax liabilities (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 |  |  | 1,800,000 | 3,600,000
Tax withholding (in dollars per share) |  |  |  | $ 9.38 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  |  | 2,225,000 | 2,014,000 | 0 | 1,046,000 | 4,807,000 | 2,040,000 | 4,239,000 | 17,224,000 | 3,184,000 | 7,893,000 | 10,688,000 | 11,250,000 | 24,647,000 | 29,831,000
Related Party | Mr. Hauf |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated vesting of restricted stock (in shares) | 37,092 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax withholding (in dollars per share) | $ 9.72 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party | Mr. Windeatt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated vesting of restricted stock (in shares) |  |  |  | 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion right (in shares) |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld to satisfy tax liabilities (in shares) |  |  |  | 700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,236,069 |  |  | 7,013,116 |  |  | 22,808,205 | 26,264,523
Stock repurchased, weighted average price (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9.88 |  |  | $ 9.05 |  |  | $ 9.34 | $ 8.06
Class A Common Stock | Related Party | Mr. Hauf |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated vesting of restricted stock (in shares) | 24,243 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion right (in shares) | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld to satisfy tax liabilities (in shares) | 12,849 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Related Party | Mr. Arthur Mbanefo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  | 12,205 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) |  | $ 9.75 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Related Party | Dr. Bell |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  | 12,727 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) |  |  | $ 9.35 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock | Related Party | Reporting Person |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of class A common stock (in shares) |  |  |  |  |  |  | 13,063 | 136,891 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchased, weighted average price (in dollars per share) |  |  |  |  |  |  | $ 9.11 | $ 6.98 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units, Tax Account | Related Party | Mr. Hauf |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated vesting of restricted stock (in shares) | 125,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newmark Holdings LPU | Related Party | Mr. Windeatt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  | 31,700 | 327,127 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount |  |  |  |  | $ 27,130 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newmark Holdings LPU | Class A Common Stock | Related Party | Mr. Windeatt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  | 239,428 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newmark Holdings PLPU | Related Party | Mr. Windeatt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  | 2,953 | 30,285 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Determination amount |  |  |  |  |  | $ 278,258 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period |  |  |  |  |  | $ 251,128 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted in period (in shares) |  |  |  |  |  | 27,332 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Newmark Holdings LPUs | Class A Common Stock | Related Party | Mr. Windeatt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  |  |  |  |  | 271,362 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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