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Equity - Summary of Unrealized Gain (Loss) on Available-for-sale Financial Assets (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Beginning balance $ 166,841,165   $ 165,924,980 $ 155,691,394
Unrealized gain (loss) arising on revaluation of available-for-sale financial assets 224,036 $ 7,559 (248,599) 10,451
Share of unrealized gain (loss) on available-for-sale financial assets of associates and joint venture accounted for using the equity method 264,389 8,920 (871,679) (4,832)
Ending balance 201,310,187 6,791,842 166,841,165 165,924,980
Reserve of gains and losses on remeasuring available-for-sale financial assets excluding changes in capital surplus [member]        
Beginning balance (197,314) (6,657) 588,119 526,778
Unrealized gain (loss) arising on revaluation of available-for-sale financial assets 169,585 5,721 (257,240) (4,304)
Cumulative loss reclassified to profit or loss on impairment of available-for-sale financial assets 50,206 1,694    
Cumulative loss (gain) reclassified to profit or loss on disposal of available-for-sale financial assets (1,517) (51) 7,512 10,827
Share of unrealized gain (loss) on available-for-sale financial assets of associates and joint venture accounted for using the equity method 401,610 13,550 (535,705) 54,818
Ending balance $ 422,570 $ 14,257 $ (197,314) $ 588,119