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Accounts Payable and Accrued and Other Liabilities - Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Payables and Accruals [Abstract] |  |
Accounts payable | $ 38,588 | $ 32,995
Payroll and employee benefits payable | 189,557 | 165,449
Severance and retention bonus payable | 26,476 | 24,281
Bonus payable | 224,763 | 192,100
Commissions payable | 130,306 | 142,499
Income tax payable | 29,550 | 7,878
VAT payable | 58,496 | 31,438
Current portion of operating lease liabilities | 83,995 | 76,516
Current portion of interest rate swap contracts at fair value | 34,886 | 0
Other accrued liabilities | 135,814 | 115,640
Total accounts payable and accrued liabilities | $ 952,431 | $ 788,796
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