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Profit Before Income Tax - Summary of Other Operating Income and Expenses, Net (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Analysis of income and expense [abstract]        
Rental income $ 131,570 $ 4,439 $ 51,607 $ 60,230
Gain (loss) on disposal of property, plant and equipment and other assets 367,110 12,386 (127,159) (127,111)
Impairment loss on property, plant and equipment and goodwill (714,675) (24,112) (888,231) (258,129)
Loss on damages and claims (85,585) (2,888) (12,778) (116,445)
Others 410,136 13,837 176,281 189,926
Other operating income and expenses, net $ 108,556 $ 3,662 $ (800,280) $ (251,529)