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Other Income (Expenses), Net - Summary of Other Income (Expenses), Net (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Analysis of income and expense [abstract]        
Gain on disposal of scrapped materials $ 52,254   $ 51,077 $ 43,652
Royalty income 907   2,962 12,336
Gain on disposal of items purchased on behalf of others 21,945   30,140 15,080
Gain on disposal of property, plant and equipment, net 33,935   48,070 20,271
Insurance compensation income       10,435
Impairment loss on property, plant and equipment (4,843)     (9,938)
Gains from lease modifications 891      
Others 20,498   3,329 1,092
Other income (expenses), net $ 125,587 $ 4,527 $ 135,578 $ 92,928