Accounts Payable and Accrued and Other Liabilities - Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Accounts payable	$ 49,277	$ 38,588
Payroll and employee benefits payable	233,704	216,033
Bonus payable	243,459	224,763
Commissions payable	201,397	130,306
Income tax payable	18,717	29,550
VAT payable	48,834	58,496
Current portion of operating lease liabilities	89,754	83,995
Other accrued liabilities, including the short-term portion of fair value of interest rate swap contracts	249,672	170,700
Total accounts payable and accrued liabilities	$ 1,134,814	$ 952,431
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Total accounts payable and accrued liabilities	Total accounts payable and accrued liabilities