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Profit Before Income Tax - Summary of Other Gains, Net (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Analysis of income and expense [abstract]        
Remeasurement gain on investments accounted for using the equity method due to step acquisition (Note 29)     $ 319,712 $ 7,421,408
Net gains on financial assets mandatorily at FVTPL $ 3,211,125 $ 114,356 3,631,763 3,388,485
Net gains (losses) arising on financial instruments held for trading (3,282,973) (116,915) (1,984,941) (1,398,995)
Gain on disposal of subsidiaries (Note 30) 802,753 28,588    
Foreign exchange gains (losses), net 1,005,374 35,805 1,125,681 (1,015,615)
Impairment losses on financial assets (Note 14)     (400,201) (521,010)
Others     (8,025)  
Gain on disposal of investments accounted for using the equity method (Note 14) 91,297 3,251    
Other gains and losses $ 1,827,576 $ 65,085 $ 2,683,989 $ 7,874,273