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, 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	62,508						48,881		13,627
Foreign currency translation adjustments	(7,591)							(6,385)	(1,206)
Cantor purchase of Cantor units from Newmark Holdings upon redemption/exchange of FPU's	863								863
Dividends to common stockholders	(7,395)						(7,395)
Earnings distributions to limited partnership interests and other noncontrolling interests	(59,906)								(59,906)
Grant of exchangeability, redemption and issuance of Class A common stock	38,301	48			30,994				7,259
Contributions of capital to and from Cantor for equity-based compensation	1,324				1,089				235
Repurchase of Class A common stock	(175,928)					(150,270)			(25,658)
Restricted stock units compensation	4,631				3,974				657
Balance at end of period at Jun. 30, 2022	1,521,000	1,988	212	1,572	523,504	(440,444)	1,121,147	(9,116)	322,137
Balance at beginning 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
Increase (Decrease) in Stockholders' Equity
Consolidated net income	61,792						48,519		13,273
Foreign currency translation adjustments	(7,279)							(6,141)	(1,138)
Cantor purchase of Cantor units from Newmark Holdings upon redemption/exchange of FPU's	863								863
Dividends to common stockholders	(5,502)						(5,502)
Earnings distributions to limited partnership interests and other noncontrolling interests	(33,861)								(33,861)
Grant of exchangeability, redemption and issuance of Class A common stock	28,356	28			22,785				5,543
Contributions of capital to and from Cantor for equity-based compensation	3,154				2,675				479
Repurchase of Class A common stock	(145,035)					(123,736)			(21,299)
Restricted stock units compensation	650				555				95
Balance at end of period at Jun. 30, 2022	1,521,000	1,988	212	1,572	523,504	(440,444)	1,121,147	(9,116)	322,137
Balance at beginning of period at Dec. 31, 2022	1,524,865	2,011	212	0	584,709	(538,612)	1,145,006	(11,989)	343,528
Increase (Decrease) in Stockholders' Equity
Consolidated net income	(5,120)						(3,921)		(1,199)
Foreign currency translation adjustments	7,951							6,546	1,405
Cantor purchase of Cantor units from Newmark Holdings upon redemption/exchange of FPU's	1,760								1,760
Dividends to common stockholders	(10,441)						(10,441)
Purchase of noncontrolling interests	(21,946)				(3,462)				(18,484)
Earnings distributions to limited partnership interests and other noncontrolling interests	(31,739)								(31,739)
Grant of exchangeability, redemption and issuance of Class A common stock	34,206	42			25,169				8,995
Contributions of capital to and from Cantor for equity-based compensation	(506)				(457)				(49)
Repurchase of Class A common stock	(13,361)					(11,005)			(2,356)
Restricted stock units compensation	9,541				7,888				1,653
Balance at end of period at Jun. 30, 2023	1,495,210	2,053	212	0	613,847	(549,617)	1,130,644	(5,443)	303,514
Balance at beginning of period at Mar. 31, 2023	1,502,841	2,039	212	0	601,150	(538,612)	1,129,441	(8,481)	317,092
Increase (Decrease) in Stockholders' Equity
Consolidated net income	11,229						6,429		4,800
Foreign currency translation adjustments	3,693							3,038	655
Cantor purchase of Cantor units from Newmark Holdings upon redemption/exchange of FPU's	1,760								1,760
Dividends to common stockholders	(5,226)						(5,226)
Earnings distributions to limited partnership interests and other noncontrolling interests	(22,422)								(22,422)
Grant of exchangeability, redemption and issuance of Class A common stock	13,280	14			9,913				3,353
Contributions of capital to and from Cantor for equity-based compensation	(151)				(154)				3
Repurchase of Class A common stock	(13,361)					(11,005)			(2,356)
Restricted stock units compensation	3,567				2,938				629
Balance at end of period at Jun. 30, 2023	$ 1,495,210	$ 2,053	$ 212	$ 0	$ 613,847	$ (549,617)	$ 1,130,644	$ (5,443)	$ 303,514