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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, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Analysis of income and expense [abstract]        
Rental income $ 153,682 $ 5,473 $ 136,301 $ 182,411
Gains (losses) on disposal of property, plant and equipment and other assets 732,796 26,097 (164,187) (14,644)
Impairment losses on property, plant and equipment (992,273) (35,337) (201,006) (133,071)
Loss on damages and claims (176,888) (6,299) (459,544) (24,114)
Others 785,175 27,961 419,881 361,001
Other operating income and expenses, net $ 502,492 $ 17,895 $ (268,555) $ 371,583