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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, 2025	Aug. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Increase (Decrease) in Stockholders' Equity
Shares outstanding at beginning of period (in shares)			154,352,509		150,384,929	149,506,832	152,639,359
Share issuances:
LPU redemption/exchange (in shares)			2,675,722		2,969,977	15,726,341	8,137,918
Other (in shares)			0		(26,879)	463,207	74,513
Treasury stock repurchases (in shares)	0	0	0	(10,839,674)	(6,779,828)	(10,839,674)	(15,745,930)
Shares outstanding at end of period (in shares)	157,491,836		157,491,836	154,352,509	146,962,810	157,491,836	146,962,810
Restricted Stock Units
Share issuances:
Issuance of Class A common stock for Newmark RSUs (in shares)			463,605		414,611	2,635,130	1,856,950

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