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Other Liabilities - Schedule of other liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Accrued employee cost	$ 22,154	$ 19,797
Earn-out consideration	3,105	5,621
Retirement benefits	13,123	11,947
Compensated absences	52,774	47,656
Derivative instruments	7,514	20,809
Contract liabilities (Note 20)	84,170	68,760
Finance lease liability	20,407	30,958
Others	44,495	32,850
Other Liabilities	$ 247,742	$ 238,398
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities	Other Liabilities

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This element represents the noncurrent portion of the fair value as at the end of the reporting period of potential payments under the contingent consideration arrangement, including cash and shares as applicable.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amounts due to Employee, not to include stockholders or officers, which are due after one year (or one business cycle).

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

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Indicates line item in statement of financial position that includes noncurrent finance lease liability.

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Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the noncurrent portion of the liabilities (due beyond one year; or beyond one operating cycle if longer).

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