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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, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Reconciliation of income tax expense and accounting profit before income tax [abstract]        
Tax calculated based on profit before tax and statutory tax rate $ 1,207,605   $ 595,258 $ 606,917
Effects from adjustments based on regulation (152,618)   26,974 (162,924)
Temporary difference not recognized as deferred tax assets     (4) (608)
Prior year income tax overestimation (184,284)   (133,923) (5,016)
Income tax on unappropriated retained earnings 227,467   105,665 74,540
Effect of different tax rates in countries in which the Group operates 148   411 770
Income tax expense $ 1,098,318 $ 39,593 $ 594,381 $ 513,679