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Profit Before Income Tax - Summary of Other Operating Income and Expenses, Net (Detail) $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($) | Dec. 31, 2015 TWD ($)
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)

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