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)	(26,316)			(16,254)		(10,062)
Foreign currency translation adjustments	(2,911)				(2,327)	(584)
Dividends to common stockholders	(5,232)			(5,232)
Earnings distributions to limited partnership interests and other noncontrolling interests	(515)					(515)
Grant of exchangeability, redemption and issuance of Class A common stock	37,420	26,850				10,534	36
Contributions of capital to and from Cantor for equity-based compensation	(301)	(243)				(58)
Repurchase of Class A common stock	(37,161)		(29,993)			(7,168)
Restricted stock units compensation	7,432	5,999				1,433
Balance at end of period at Mar. 31, 2024	1,551,098	690,342	(599,228)	1,145,189	(6,882)	319,334	2,131	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)	(15,949)			(8,766)		(7,183)
Foreign currency translation adjustments	5,927				4,973	954
Dividends to common stockholders	(5,420)			(5,420)
Exchange of Cantor Units for Newmark Class A common stock, 7,221,277 shares	0	90,030		0		(90,102)	72
Earnings distributions to limited partnership interests and other noncontrolling interests	(11,198)					(11,198)
Grant of exchangeability, redemption and issuance of Class A common stock	36,179	23,634				12,492	53
Contributions of capital to and from Cantor for equity-based compensation	(828)	(700)				(128)
Forfeiture of Class A common stock	(740)	23	(648)			(115)
Restricted stock units compensation	11,761	9,940				1,821
Other	3,090	2,611				479
Balance at end of period at Mar. 31, 2025	$ 1,546,991	$ 878,539	$ (746,579)	$ 1,193,099	$ (6,314)	$ 225,664	$ 2,370	$ 212