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Profit Before Income Tax - Summary of Other Income (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]        
Bank deposits $ 529,132 $ 19,074 $ 520,783 $ 549,681
Contracts with customers 13,197 476    
Government subsidies 767,918 27,683 803,049 624,351
Dividends income 289,852 10,449 150,715 185,061
Other income $ 1,600,099 $ 57,682 $ 1,474,547 $ 1,359,093