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Profit Before Income Tax - Summary of Other Gains, Net (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Analysis of income and expense [abstract]        
Gain on remeasurement of investments accounted for using the equity method (Note 15) $ 242,451 $ 7,421,408    
Net gains on financial assets mandatorily at FVTPL 110,699 3,388,485    
Gain on disposal of subsidiaries (Note 31)     $ 5,589,457  
Net gains (losses) arising on financial instruments held for trading (45,704) (1,398,995) (3,111,253) $ 224,446
Net gains on financial assets designated as at FVTPL     327,351 223,113
Foreign exchange gains (losses), net (33,180) (1,015,615) 3,502,586 1,928,384
Impairment losses on financial assets (17,021) (521,010) (50,206) (91,886)
Others     1,518 (7,513)
Other gains and losses $ 257,245 $ 7,874,273 $ 6,259,453 $ 2,276,544