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Other Income (Expenses), Net - Summary of Other Income (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]        
Gain on disposal of scrapped materials $ 51,077   $ 43,652 $ 59,380
Royalty income 2,962   12,336 43,224
Gain on disposal of items purchased on behalf of others 30,140   15,080 31,268
Gain on disposal of property, plant and equipment, net 48,070   20,271 14,274
Insurance compensation income     10,435 147
Impairment loss on property, plant and equipment     (9,938)  
Others 3,329   1,092 (779)
Other income (expenses), net $ 135,578 $ 4,828 $ 92,928 $ 147,514