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Related Party Transactions - Summary of Compensation to Key Management Personnel (Detail)
$ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Disclosure of transactions between related parties [abstract]        
Short-term employee benefits $ 860,631 $ 29,036 $ 790,460 $ 812,002
Post-employment benefits 2,858 97 4,790 3,944
Share-based payments     11,547 17,937
Total $ 863,489 $ 29,133 $ 806,797 $ 833,883