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Other Operating Income (Expenses), Net - Summary of Other Operating Income (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]        
Gain on disposal of property, plant and equipment, net $ 20,271   $ 14,274 $ 132,777
Impairment loss on property, plant and equipment (9,938)     (956)
Gain on disposal of scrapped materials 43,652   59,380 27,940
Gain on disposal of items purchased on behalf of others 15,080   31,268 26,417
Royalty income 12,336   43,224 11,998
Insurance compensation income 10,435   147 486,858
Others 1,092   (779) 7,800
Other operating income (expenses), net $ 92,928 $ 3,107 $ 147,514 $ 692,834