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Significant 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]      
Short-term employee benefits $ 1,223,667 $ 1,462,964 $ 2,047,118
Post-employment benefits 2,603 2,732 2,782
Share-based payment 298,500 500,391 719,786
Others 417 618 649
Total $ 1,525,187 $ 1,966,705 $ 2,770,335