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Related Party Transactions - Key Management Personnel Compensation (Detail) - TWD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of transactions between related parties [abstract]      
Salaries and other short-term employee benefits $ 178,713 $ 151,095 $ 188,105
Post-employment compensation 2,049 2,067 5,622
Share-based payments   6,763 18,736
Total key management personnel compensation $ 180,762 $ 159,925 $ 212,463