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Schedule of Prepayments and Other Current Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Prepaid And Other Current Assets [Line Items] |  |
Contract manufacturer and supplier prepayments | $ 212,286 | $ 143,392
Prepaid taxes | 9,361 | 8,046
Prepaid maintenance and other services | 13,116 | 8,503
Other prepayments | 15,329 | 16,753
Total prepayments | $ 250,092 | $ 176,694

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