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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, 2023
TWD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Disclosure of associates [line items]        
Other comprehensive income (loss), net of income tax $ (170,976) $ (5,584) $ 184,329 $ 84,203
Total comprehensive income (loss) for the year 1,796,589 $ 58,674 3,624,026 5,021,470
Individually Immaterial Associates [member]        
Disclosure of associates [line items]        
Profit for the year from continuing operations 1,714   453,715 625,733
Other comprehensive income (loss), net of income tax 12,993   (28,254) 28,843
Total comprehensive income (loss) for the year $ 14,707   $ 425,461 $ 654,576