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Inventories - Additional Information (Detail)
$ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Classes of current inventories [abstract]        
Cost of inventories recognized as operating costs $ 10,095,421 $ 309,020,850 $ 237,193,286 $ 219,630,270
Write-downs of inventories $ 32,046 $ 980,927 $ 398,824 $ 451,780