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Profit Before Income Tax - Summary of Other Gains and Losses (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Analysis of income and expense [abstract]        
Net gain on financial assets mandatorily at FVTPL $ 11,726,761 $ 357,632 $ 6,155,995 $ 10,244,928
Net loss arising on financial instruments held for trading (1,908,202) (58,195) (4,295,484) (6,137,183)
Gain on disposal of subsidiaries (Note 30) 0 0 529,721 0
Foreign exchange gains (losses), net (5,538,433) (168,907) 998,111 (2,459,474)
Gain on bargain purchase (Note 29) 76,715 2,340 0 0
Impairment loss on investments accounted for using the equity method (Note 14) (42,143) (1,285) 0 (61,206)
Gain on disposal of investments accounted for using the equity method 20,952 639 55,795 80,317
Others 14,342 438 0 0
Other gains and losses $ 4,349,992 $ 132,662 $ 3,444,138 $ 1,667,382