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Inventories - Additional Information (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
Classes of current inventories [abstract] |  |  |  |
Cost of inventories recognized as operating costs | $ 237,193,286 | $ 8,002,473 | $ 219,630,270 | $ 233,165,722
Write-downs of inventories | $ 398,824 | $ 13,456 | $ 451,780 | $ 352,011

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