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Profit Before Income Tax - Summary of Other Gains and Losses (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Analysis of income and expense [abstract]        
Gain on disposal of subsidiaries (Note 29) $ 5,589,457 $ 188,578    
Net gain (loss) arising on financial instruments held for trading (3,111,253) (104,968) $ 224,446 $ 1,657,093
Net gain on financial assets designated as at FVTPL 327,351 11,044 223,113 815,742
Foreign exchange gain or loss, net 3,502,586 118,171 1,928,384 (713,213)
Impairment loss on financial assets (50,206) (1,694) (91,886)  
Others 1,518 52 (7,513) (10,827)
Other gains and losses $ 6,259,453 $ 211,183 $ 2,276,544 $ 1,748,795