Accounts Payable, Accrued Expenses and Other Liabilities - Components of Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Payables and Accruals [Abstract]
Accrued compensation	$ 99,102	$ 96,839
Payroll and other taxes payable	70,753	70,677
Financial guarantee liability	26,184	25,989	$ 29,581
Deferred rent	11,433	9,872
Contingent consideration	3,635	3,635
Total	$ 211,107	$ 207,012