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Related Party Transactions - Transactions with Executive Officers and Directors (Details) - USD ($)									1 Months Ended						3 Months Ended						9 Months Ended
	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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