CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Class A Common Stock Common Stock	Class B Common Stock Common Stock
Balance at beginning of period at Dec. 31, 2023	$ 1,578,682	$ 657,736	$ (569,235)	$ 1,166,675	$ (4,555)	$ 325,754	$ 2,095	$ 212
Increase (Decrease) in Stockholders' Equity
Consolidated net income (loss)	(2,900)			(1,973)		(927)
Foreign currency translation adjustments	(5,062)				(4,052)	(1,010)
Dividends to common stockholders	(10,422)			(10,422)
Earnings distributions to limited partnership interests and other noncontrolling interests	(2,300)					(2,300)
Grant of exchangeability, redemption and issuance of Class A common stock	54,122	37,843				16,209	70
Contributions of capital to and from Cantor for equity-based compensation	(438)	(353)				(85)
Repurchase of Class A Common Stock	(92,668)		(74,705)			(17,963)
Forfeiture of Class A common stock	(5,549)	410	(4,880)			(1,079)
Restricted stock units compensation	9,498	7,663				1,835
Balance at end of period at Jun. 30, 2024	1,522,963	703,299	(648,820)	1,154,280	(8,607)	320,434	2,165	212
Balance at beginning of period at Mar. 31, 2024	1,551,098	690,342	(599,228)	1,145,189	(6,882)	319,334	2,131	212
Increase (Decrease) in Stockholders' Equity
Consolidated net income (loss)	23,415			14,280		9,135
Foreign currency translation adjustments	(2,151)				(1,725)	(426)
Dividends to common stockholders	(5,189)			(5,189)
Earnings distributions to limited partnership interests and other noncontrolling interests	(1,785)					(1,785)
Grant of exchangeability, redemption and issuance of Class A common stock	16,702	10,993				5,675	34
Contributions of capital to and from Cantor for equity-based compensation	(137)	(110)				(27)
Repurchase of Class A Common Stock	(55,507)		(44,712)			(10,795)
Forfeiture of Class A common stock	(5,549)	410	(4,880)			(1,079)
Restricted stock units compensation	2,066	1,664				402
Balance at end of period at Jun. 30, 2024	1,522,963	703,299	(648,820)	1,154,280	(8,607)	320,434	2,165	212
Balance at beginning of period at Dec. 31, 2024	1,524,169	753,001	(745,931)	1,207,285	(11,287)	318,644	2,245	212
Increase (Decrease) in Stockholders' Equity
Consolidated net income (loss)	13,562			12,053		1,509
Foreign currency translation adjustments	19,147				15,975	3,172
Dividends to common stockholders	(10,965)			(10,965)
Exchange of Cantor Units for Newmark Class A common stock	0	90,030				(90,102)	72
Earnings distributions to limited partnership interests and other noncontrolling interests	(5,881)					(5,881)
Grant of exchangeability, redemption and issuance of Class A common stock	78,245	54,738				23,421	86
Contributions of capital to and from Cantor for equity-based compensation	(1,219)	(1,027)				(192)
Repurchase of Class A Common Stock	(125,523)		(105,039)			(20,484)
Forfeiture of Class A common stock	(1,090)	23	(941)			(172)
Restricted stock units compensation	20,210	17,010				3,200
Other	2,800	2,611	(243)			432
Balance at end of period at Jun. 30, 2025	1,513,455	916,386	(852,154)	1,208,373	4,688	233,547	2,403	212
Balance at beginning of period at Mar. 31, 2025	1,546,991	878,539	(746,579)	1,193,099	(6,314)	225,664	2,370	212
Increase (Decrease) in Stockholders' Equity
Consolidated net income (loss)	29,511			20,819		8,692
Foreign currency translation adjustments	13,219				11,002	2,217
Dividends to common stockholders	(5,545)			(5,545)
Earnings distributions to limited partnership interests and other noncontrolling interests	5,317					5,317
Grant of exchangeability, redemption and issuance of Class A common stock	42,067	31,104				10,930	33
Contributions of capital to and from Cantor for equity-based compensation	(391)	(327)				(64)
Repurchase of Class A Common Stock	(125,523)		(105,039)			(20,484)
Forfeiture of Class A common stock	(350)		(293)			(57)
Restricted stock units compensation	8,449	7,070				1,379
Other	(290)		(243)			(47)
Balance at end of period at Jun. 30, 2025	$ 1,513,455	$ 916,386	$ (852,154)	$ 1,208,373	$ 4,688	$ 233,547	$ 2,403	$ 212