Stock Transactions and Unit Purchases - Schedule of Changes in Shares of Common Stock Outstanding (Details) - Class A Common Stock - shares	1 Months Ended				3 Months Ended			9 Months Ended
	Sep. 30, 2024	Aug. 31, 2024	Jul. 31, 2024	Apr. 30, 2024	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Increase (Decrease) in Stockholders' Equity
Shares outstanding at beginning of period (in shares)			150,384,929		150,384,929	152,639,359	152,234,598	152,639,359	150,384,605
Share issuances:
LPU redemption/exchange (in shares)					2,969,977		1,633,627	8,137,918	4,719,878
Other (in shares)					(26,879)		0	74,513	(154,189)
Treasury stock repurchases (in shares)	(2,266,898)	(4,512,930)	0	(5,502,703)	(6,779,828)	(3,463,399)	(2,787,291)	(15,745,930)	(5,141,508)
Shares outstanding at end of period (in shares)	146,962,810				146,962,810		151,461,689	146,962,810	151,461,689
Restricted Stock Units
Share issuances:
Issuance of Class A common stock for Newmark RSUs (in shares)					414,611		380,755	1,856,950	1,652,903