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Profit Before Income Tax - Summary of Other Gains, Net (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Analysis of income and expense [abstract]        
Remeasurement gain on investments accounted for using the equity method due to step acquisition (Note 14) $ 319,712 $ 10,689 $ 7,421,408  
Net gains on financial assets mandatorily at FVTPL 3,631,763 121,423 3,388,485  
Gain on disposal of subsidiaries (Note 31)       $ 5,589,457
Net gains (losses) arising on financial instruments held for trading (1,984,941) (66,364) (1,398,995) (3,111,253)
Net gains on financial assets designated as at FVTPL       327,351
Foreign exchange gains (losses), net 1,125,681 37,635 (1,015,615) 3,502,586
Impairment losses on financial assets (400,201) (13,380) (521,010) (50,206)
Others (8,025) (268)   1,518
Other gains and losses $ 2,683,989 $ 89,735 $ 7,874,273 $ 6,259,453