CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
FPU's
Issuance of Class A common stock for Newmark RSUs (in shares)	415,432	1,831,924
Common Stock
Dividends declared per share of common stock (in dollars per share)	$ 0.12	$ 0.04	$ 0.13
Dividends declared and paid per share of common stock (in dollars per share)	$ 0.10	$ 0.04	$ 0.13
Class A Common Stock
Treasury stock repurchases (in shares)	24,918,482	20,237,430	930,226
Class A Common Stock | Common Stock
Grant of exchangeability, redemption and issuance of limited partnership interests and issuance of common stock (in shares)	7,030,716	27,333,907	5,840,659
Treasury stock repurchases (in shares)	24,918,482	20,237,430	930,226