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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, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 TWD ($)
Analysis of income and expense [abstract] |  |  |  |
Rental income | $ 136,301 | $ 4,557 | $ 182,411 | $ 131,570
Gains (losses) on disposal of property, plant and equipment and other assets | (164,187) | (5,490) | (14,644) | 367,110
Impairment losses on property, plant and equipment and goodwill | (201,006) | (6,720) | (133,071) | (714,675)
Loss on damages and claims | (459,544) | (15,364) | (24,114) | (85,585)
Others | 419,881 | 14,038 | 361,001 | 410,136
Other operating income and expenses, net | $ (268,555) | $ (8,979) | $ 371,583 | $ 108,556

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