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Profit Before Income Tax - Summary of Other Gains and Losses (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Analysis of income and expense [abstract]        
Net gain on financial assets mandatorily at FVTPL $ 10,244,928 $ 333,385 $ 1,199,065 $ 3,211,125
Net loss arising on financial instruments held for trading (6,137,183) (199,713) (2,689,070) (3,282,973)
Gain on disposal of subsidiaries (Note 30)     17,340,418 802,753
Foreign exchange gains (losses), net (2,459,474) (80,035) 1,395,054 1,005,374
Gain recognized in bargain purchase transaction (Note 29)     33,114  
Impairment loss on investments accounted for using the equity method (Note 14) (61,206) (1,992)    
Gain (loss) on disposal of investments accounted for using the equity method 80,317 2,614 (67,482) 91,297
Other gains and losses $ 1,667,382 $ 54,259 $ 17,211,099 $ 1,827,576