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Investments accounted for using equity method - Summarized Financial Information for Investment in Material Associates (Detail)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure of associates [line items]        
Other comprehensive income (loss), net of income tax $ 109,617 $ 3,343 $ (170,976) $ 184,329
Total comprehensive income (loss) for the year 1,549,153 $ 47,245 1,796,589 3,624,026
Individually Immaterial Associates [member]        
Disclosure of associates [line items]        
Profit for the year from continuing operations 2,683   1,714 453,715
Other comprehensive income (loss), net of income tax 16,978   12,993 (28,254)
Total comprehensive income (loss) for the year $ 19,661   $ 14,707 $ 425,461