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Related Party Transactions - Summary of Compensation to Key Management Personnel (Detail)
$ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of transactions between related parties [abstract]        
Short-term employee benefits $ 1,027,191 $ 34,343 $ 1,041,216 $ 860,631
Post-employment benefits 2,208 74 3,884 2,858
Share-based payments 134,544 4,498 9,145  
Total $ 1,163,943 $ 38,915 $ 1,054,245 $ 863,489