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Income Tax - Summary of Income Tax Recognized in Other Comprehensive Income (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Income tax relating to components of other comprehensive income [abstract]        
Deferred income tax Related to remeasurement of defined benefit plans $ (62,184) $ (1,896) $ (2,214) $ (208,482)
Unrealized gain (loss) on equity instruments at fair value through other comprehensive income (22,288) (680) (262,404) 370,091
Unrealized loss on debt instruments at fair value through other comprehensive income 2,315 71 (5,792) 0
Income tax recognized in other comprehensive income $ (82,157) $ (2,505) $ (270,410) $ 161,609