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Related Party Transactions - Key Management Personnel Compensation (Detail) - TWD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of transactions between related parties [abstract]      
Salaries and other short-term employee benefits $ 186,854 $ 178,713 $ 151,095
Post-employment compensation 4,258 2,049 2,067
Share-based payments     6,763
Total key management personnel compensation $ 191,112 $ 180,762 $ 159,925