CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Common Stock Contingent Class A Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Balance at beginning of period at Dec. 31, 2020	$ 921,147	$ 1,676	$ 212	$ 1,572	$ 351,450	$ (40,531)	$ 342,764	$ (2,094)	$ 266,098
Increase (Decrease) in Stockholders' Equity
Consolidated net income	44,578						33,105		11,473
Foreign currency translation adjustments	(625)							(518)	(107)
Cantor purchase of Cantor units from Newmark Holdings upon redemption/ exchange of FPU's	4,025								4,025
Dividends to common stockholders	(1,841)						(1,841)
Preferred dividend on exchangeable preferred partnership units	0						(1,641)		1,641
Earnings distributions to limited partnership interests and other noncontrolling interests	(4,013)								(4,013)
Grant of exchangeability, redemption and issuance of Class A common stock	13,689	19			10,706				2,964
Repurchase of Class A common stock	(9,283)					(7,690)			(1,593)
Restricted stock units compensation	2,996				2,057				939
Balance at end of period at Mar. 31, 2021	970,673	1,695	212	1,572	364,213	(48,221)	372,387	(2,612)	281,427
Balance at beginning of period at Dec. 31, 2021	1,664,193	1,940	212	1,572	487,447	(290,174)	1,079,661	(2,731)	386,266
Increase (Decrease) in Stockholders' Equity
Consolidated net income	714						362		352
Foreign currency translation adjustments	(312)							(244)	(68)
Dividends to common stockholders	(1,893)						(1,893)
Earnings distributions to limited partnership interests and other noncontrolling interests	(26,045)								(26,045)
Grant of exchangeability, redemption and issuance of Class A common stock	9,947	20			8,209				1,718
Contributions of capital to and from Cantor for equity-based compensation	(1,830)				(1,586)				(244)
Repurchase of Class A common stock	(30,893)					(26,534)			(4,359)
Restricted stock units compensation	3,981				3,419				562
Balance at end of period at Mar. 31, 2022	$ 1,617,862	$ 1,960	$ 212	$ 1,572	$ 497,489	$ (316,708)	$ 1,078,130	$ (2,975)	$ 358,182