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Income Tax Expense - Reconciliation of Income Tax Expense and Accounting Profit Before Income Tax (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Reconciliation of income tax expense and accounting profit before income tax [abstract]        
Tax calculated based on profit before tax and statutory tax rate $ 804,086   $ 1,207,605 $ 595,258
Effects from adjustments based on regulation (131,873)   (152,618) 26,974
Gain on investment in associates 11,923      
Temporary difference not recognized as deferred tax assets       (4)
Prior year income tax overestimation (255,935)   (184,284) (133,923)
Income tax on unappropriated retained earnings 159,744   227,467 105,665
Effect of different tax rates in countries in which the Group operates 230   148 411
Income tax expense $ 588,175 $ 19,140 $ 1,098,318 $ 594,381