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Equity - Summary of Exchange Differences on Translating Foreign Operations (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
Exchange differences arising on translating foreign operations (5,287,734) $ (178,399) (6,445,643) (63,509)
Share of exchange difference 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
Exchange differences on translating foreign operations [member]        
Beginning balance (1,643,623) (55,453) 4,492,671 4,540,862
Exchange differences arising on translating foreign operations (4,952,815) (167,099) (5,843,856) 11,459
Share of exchange difference of associates and joint venture accounted for using the equity method (137,221) (4,630) (292,438) (59,650)
Ending balance $ (6,733,659) $ (227,182) $ (1,643,623) $ 4,492,671