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Income Tax Expense - Major Components of Income Tax Expense (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Current income tax:        
Current income tax on profits for the period $ 273,836   $ 426,878 $ 771,378
Income tax on unappropriated retained earnings 66,066   85,607 159,744
Prior year income tax overestimation (127,768)   (182,778) (255,935)
Total current income tax 212,134   329,707 675,187
Deferred income tax:        
Relating to origination and reversal of temporary differences (4,617)   (29,046) (87,012)
Income tax expense $ 207,517 $ 6,328 $ 300,661 $ 588,175