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Schedule of Prepayments and Other Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Prepaid And Other Current Assets [Line Items]    
Contract manufacturer and supplier prepayments $ 139,232 $ 131,642
Prepaid taxes 10,810 9,646
Prepaid maintenance and other services 9,935 8,487
Other prepayments 16,086 12,744
Total prepayments $ 176,063 $ 162,519