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Related Party Transactions - Key Management Personnel Compensation (Detail) - TWD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of transactions between related parties [abstract]      
Salaries and other short-term employee benefits $ 176,702 $ 211,620 $ 243,405
Post-employment compensation 2,158 2,197 2,156
Total key management personnel compensation $ 178,860 $ 213,817 $ 245,561