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Related Party Transactions - Summary of Compensation to Key Management Personnel (Detail)
$ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Disclosure of transactions between related parties [abstract]        
Short-term employee benefits $ 34,015 $ 1,041,216 $ 860,631 $ 790,460
Post-employment benefits 127 3,884 2,858 4,790
Share-based payments 299 9,145   11,547
Total $ 34,441 $ 1,054,245 $ 863,489 $ 806,797