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, 2023	May 31, 2023	Apr. 30, 2023	Jan. 31, 2023	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Share issuances:
Other (in shares)					1,051	51,314
Class A Common Stock
Increase (Decrease) in Stockholders' Equity
Shares outstanding at beginning of period (in shares)			153,142,810	150,384,605	153,142,810	168,557,363	150,384,605	168,272,371
Share issuances:
LPU redemption/exchange (in shares)					1,158,346	2,395,043	3,086,251	3,329,911
Other (in shares)							(154,189)	64,835
Treasury stock repurchases (in shares)	(38,330)	(2,315,213)	(674)	0	(2,354,217)	(11,370,647)	(2,354,217)	(13,053,518)
Shares outstanding at end of period (in shares)	152,234,598				152,234,598	160,002,640	152,234,598	160,002,640
Class A Common Stock | Restricted Stock Units
Share issuances:
Issuance of Class A common stock for Newmark RSUs (in shares)					286,608	369,567	1,272,148	1,389,041