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Equity - Summary of Exchange Differences on Translating Foreign Operations (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Balance at January 1   $ 201,310,187 $ 166,841,165 $ 165,924,980
Exchange differences on translating foreign operations $ 7,443 227,821 (5,287,734) (6,445,643)
Share from associates and joint venture accounted for using the equity method 4,463 136,608 264,389 (871,679)
Balance at December 31 7,155,436 219,027,922 201,310,187 166,841,165
Exchange differences on translating foreign operations [member]        
Balance at January 1 (219,982) (6,733,659) (1,643,623) 4,492,671
Exchange differences on translating foreign operations 13,923 426,186 (4,952,815) (5,843,856)
Share from associates and joint venture accounted for using the equity method 4,463 136,608 (137,221) (292,438)
Disposal of associates and joint venture accounted for using the equity method 9,222 282,291    
Balance at December 31 $ (192,374) $ (5,888,574) $ (6,733,659) $ (1,643,623)