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Profit Before Income Tax - Summary of Other Income (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Analysis of income and expense [abstract]        
Bank deposits $ 646,407 $ 21,035 $ 529,132 $ 520,783
Contracts with customers 8,340 271 13,197  
Government subsidies 797,612 25,956 767,918 803,049
Dividends income 278,381 9,059 289,852 150,715
Other income $ 1,730,740 $ 56,321 $ 1,600,099 $ 1,474,547