Stock Transactions and Unit Redemptions - Schedule of Changes in Shares of Common Stock Outstanding (Details) - shares	1 Months Ended			3 Months Ended			6 Months Ended
	Jun. 30, 2022	May 31, 2022	Apr. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Share issuances:
Other (in shares)				51,314
Class A Common Stock
Increase (Decrease) in Stockholders' Equity
Shares outstanding at beginning of period (in shares)			168,557,363	168,557,363	168,272,371	163,113,922	168,272,371	161,175,894
Share issuances:
LPU redemption/exchange (in shares)				2,395,043		1,140,363	3,329,911	2,992,165
Other (in shares)						18,817,132	64,835	18,817,132
Treasury stock repurchases (in shares)	(800,661)	(4,544,224)	(6,025,762)	(11,370,647)	(1,682,871)	(3,613,098)	(13,053,518)	(4,492,341)
Shares outstanding at end of period (in shares)	160,002,640			160,002,640	168,557,363	179,736,458	160,002,640	179,736,458
Class A Common Stock | Restricted Stock Units (RSUs)
Share issuances:
Issuance of Class A common stock for Newmark RSUs (in shares)				369,567		278,139	1,389,041	1,243,608