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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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