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Related Party Transactions - Key Management Personnel Compensation (Detail) - TWD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of transactions between related parties [abstract]      
Salaries and other short-term employee benefits $ 181,436 $ 176,702 $ 211,620
Post-employment compensation 2,396 2,158 2,197
Total key management personnel compensation $ 183,832 $ 178,860 $ 213,817