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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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