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Related Party Transactions - Key Management Personnel Compensation (Detail) - TWD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of transactions between related parties [abstract]      
Salaries and other short-term employee benefits $ 243,405 $ 186,854 $ 178,713
Post-employment compensation 2,156 4,258 2,049
Total key management personnel compensation $ 245,561 $ 191,112 $ 180,762