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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, 2018 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2016 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Rental income | $ 5,959 | $ 182,411 | $ 131,570 | $ 51,607
Gains (losses) on disposal of property, plant and equipment and other assets | (479) | (14,644) | 367,110 | (127,159)
Impairment losses on property, plant and equipment and goodwill | (4,347) | (133,071) | (714,675) | (888,231)
Loss on damages and claims | (788) | (24,114) | (85,585) | (12,778)
Others | 11,794 | 361,001 | 410,136 | 176,281
Other operating income and expenses, net | $ 12,139 | $ 371,583 | $ 108,556 | $ (800,280)

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