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Income Tax Expense - Major Components of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Current income tax:        
Current income tax on profits for the period $ 1,109,752   $ 636,876 $ 408,788
Income tax on unappropriated retained earnings 227,467   105,665 74,540
Prior year income tax overestimation (184,284)   (133,923) (5,016)
Total current income tax 1,152,935   608,618 478,312
Deferred income tax:        
Relating to origination and reversal of temporary differences (54,617)   (14,237) 35,367
Income tax expense $ 1,098,318 $ 39,593 $ 594,381 $ 513,679