CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Dividends declared per share of common stock (in dollars per share)	$ 0.12	$ 0.12
Dividends declared and paid per share of common stock (in dollars per share)	$ 0.12	$ 0.10
Common Stock
Dividends declared per share of common stock (in dollars per share)			$ 0.04
Dividends declared and paid per share of common stock (in dollars per share)			$ 0.04
Class A Common Stock
Cantor purchase of Cantor units from Newmark Holdings upon redemption/exchange of FPU's (in shares)	2,307,339	0
Treasury stock repurchases (in shares)	5,785,370	24,918,482	20,237,430
Class A Common Stock | Common Stock
Grant of exchangeability, redemption and issuance of limited partnership interests and issuance of common stock (in shares)	8,040,128	7,030,716	27,333,907
Treasury stock repurchases (in shares)	5,785,370	24,918,482	20,237,730
FPU's
Cantor purchase of Cantor units from Newmark Holdings upon redemption/exchange of FPU's (in shares)	422,646	415,432	1,831,824