Compensation - Units Redeemed in Connection with Issuance of Class A Common Stock (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Number of units redeemed (in shares)	9,376,796	50,181,129	4,977,354
BGC Units
Share-based Compensation Arrangement by Share-based Payment Award
Number of units redeemed (in shares)	142,194	13,803,080	315,685
Newmark Units
Share-based Compensation Arrangement by Share-based Payment Award
Number of units redeemed (in shares)	9,234,602	36,378,049	4,661,669