Related Party Transactions - Service Agreements and Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction
Fees to related parties	$ 27,204	$ 28,502	$ 23,789
Loans, forgivable loans and other receivables from employees and partners, net	651,197	500,833
Labor and related expense	1,628,885	1,693,096	2,185,232
Cantor Fitzgerald Limited Partnership and B G C Partners Incorporation | Related Party
Related Party Transaction
Fees to related parties	27,200	28,500	23,800
Employee Loans
Related Party Transaction
Labor and related expense	$ 92,900	$ 84,100	$ 79,400