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Related Party Transactions - Service Agreements and Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Related Party Transaction
Fees to related parties	$ 5,782	$ 5,205	$ 12,032	$ 11,017
Loans, forgivable loans and other receivables from employees and partners, net	451,190		451,190		$ 454,270
Labor and Related Expense	808,929	241,378	1,112,251	554,549
Employee Loans
Related Party Transaction
Loans, forgivable loans and other receivables from employees and partners, net	451,200		451,200		$ 454,300
Labor and Related Expense	19,500	17,500	36,800	31,900
Cantor Fitzgerald Limited Partnership And B G C Partners Incorporation
Related Party Transaction
Fees to related parties	$ 5,800	$ 5,200	$ 12,000	$ 11,000

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Amounts due from an Entity employee, not to include stockholders or officers, which are usually due after 1 year (or 1 business cycle).

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