CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Dividends declared per share of common stock (in dollars per share)	$ 0.03	$ 0.03	$ 0.09	$ 0.09
Dividends declared and paid per share of common stock (in dollars per share)	$ 0.03	$ 0.03	$ 0.09	$ 0.09
FPU's
Issuance of Class A common stock for Newmark RSUs (in shares)				422,646
Class A Common Stock
Treasury stock repurchases (in shares)	6,779,828	2,787,291	15,745,930	5,141,508
Forfeited of shares (in shares)	26,879		263,268
Class A Common Stock | Common Stock
Grant of exchangeability, redemption and issuance of limited partnership interests and issuance of common stock (in shares)	3,384,588	2,014,382	9,994,868	6,218,592
Treasury stock repurchases (in shares)	6,779,828	2,787,291	15,745,930	5,141,508