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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, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Reconciliation of income tax expense and accounting profit before income tax [abstract]        
Tax calculated based on profit before tax and statutory tax rate $ 451,676   $ 804,086 $ 1,207,605
Effects from adjustments based on regulation (74,094)   (131,873) (152,618)
Gain on investment in associates 19,228   11,923  
Prior year income tax overestimation (182,778)   (255,935) (184,284)
Income tax on unappropriated retained earnings 85,607   159,744 227,467
Effect of different tax rates in countries in which the Group operates 1,022   230 148
Income tax expense $ 300,661 $ 9,819 $ 588,175 $ 1,098,318