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Schedule of Prepayments and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Prepaid And Other Current Assets [Line Items]
Contract manufacturer and supplier prepayments	$ 82,503	$ 84,473
Prepaid maintenance and other services	8,189	7,676
Prepaid taxes	5,039	4,664
Other prepayments	12,386	11,641
Total prepayments	$ 108,117	$ 108,454

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