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Profit Before Income Tax - Summary of Other Gains and Losses (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Analysis of income and expense [abstract]        
Remeasurement gain on investments accounted for using the equity method due to step acquisition       $ 319,712
Net gain on financial assets mandatorily at FVTPL $ 1,199,065 $ 43,225 $ 3,211,125 3,631,763
Net loss arising on financial instruments held for trading (2,689,070) (96,938) (3,282,973) (1,984,941)
Gain on disposal of subsidiaries (Note 30) 17,340,418 625,105 802,753  
Foreign exchange gain, net 1,395,054 50,290 1,005,374 1,125,681
Gain recognized in bargain purchase transaction (Note 29) 33,114 1,194   0
Gain (loss) on disposal of investments accounted for using the equity method (67,482) (2,433) 91,297  
Impairment loss on financial assets       (400,201)
Others       (8,025)
Other gains and losses $ 17,211,099 $ 620,443 $ 1,827,576 $ 2,683,989