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Schedule of Prepayments and Other Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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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

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