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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, 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