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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, 2022
TWD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Disclosure of associates [line items]        
Other comprehensive income (loss), net of income tax $ 184,329 $ 5,998 $ 84,203 $ 115,308
Total comprehensive income (loss) for the year 3,624,026 $ 117,931 5,021,470 2,494,286
Individually Immaterial Associates [member]        
Disclosure of associates [line items]        
(Loss) profit for the year from continuing operations 453,715   625,733 (147,329)
Other comprehensive income (loss), net of income tax (28,254)   28,843 23,143
Total comprehensive income (loss) for the year $ 425,461   $ 654,576 $ (124,186)