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Inventories - Additional Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Classes of current inventories [abstract] |  |  |  |
Cost of inventories recognized as operating costs | $ 347,877,603 | $ 11,630,813 | $ 309,020,850 | $ 237,193,286
Write-downs of inventories | $ 452,134 | $ 15,117 | $ 980,927 | $ 398,824

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