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Accrued Expenses Payable - Summary of Accrued Expenses Payable (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Accrued expenses [abstract]    
Accruals and estimations $ 9,059 $ 5,849
Labor related provisions 44,188 31,785
Liability for social security contributions 6,432 5,700
Other 642 1,028
Accrued expenses payable $ 60,321 $ 44,362