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Accrued Expenses and Other Current Liabilities - Schedule of accrued expenses and other current liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Payables and Accruals [Abstract] |  |
Accrued expenses | $ 153,186 | $ 150,390
Accrued employee cost | 250,136 | 286,399
Earn-out consideration | 3,051 | 2,651
Statutory liabilities | 68,203 | 104,768
Retirement benefits | 1,301 | 1,967
Compensated absences | 27,972 | 28,635
Derivative instruments | 15,314 | 20,172
Contract liabilities | 150,322 | 154,717
Finance lease liability | 21,348 | 18,066
Other liabilities | 45,147 | 39,004
Accrued expenses and other current liabilities, net | $ 735,980 | $ 806,769
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Accrued expenses and other current liabilities, net | Accrued expenses and other current liabilities, net

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