Stock Transactions and Unit Redemptions - Schedule of Changes in Shares of Common Stock Outstanding (Details) - Class A Common Stock - shares	1 Months Ended			3 Months Ended
	Mar. 31, 2022	Feb. 28, 2022	Jan. 31, 2022	Mar. 31, 2022	Mar. 31, 2021
Increase (Decrease) in Stockholders' Equity
Shares outstanding at beginning of period (in shares)			168,272,371	168,272,371	161,175,894
Share issuances:
LPU redemption/exchange (in shares)				934,868	1,851,802
Other (in shares)				13,521	0
Treasury stock repurchases (in shares)	0	(166,265)	(1,516,606)	(1,682,871)	(879,243)
Shares outstanding at end of period (in shares)	168,557,363			168,557,363	163,113,922
Restricted Stock Units (RSUs)
Share issuances:
Issuance of Class A common stock for Newmark RSUs (in shares)				1,019,474	965,469