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Schedule of Prepayments and Other Current Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Prepaid And Other Current Assets [Line Items]    
Contract manufacturer and supplier prepayments $ 131,642 $ 82,503
Prepaid taxes 9,646 5,039
Prepaid maintenance and other services 8,487 8,189
Other prepayments 12,744 12,386
Total prepayments $ 162,519 $ 108,117