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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, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of associates [line items]        
Other comprehensive income, net of income tax $ 84,203 $ 3,035 $ 115,308 $ (127,266)
Total comprehensive income for the year 5,021,470 $ 181,019 2,494,286 2,381,308
Individually Immaterial Associates [member]        
Disclosure of associates [line items]        
(Loss) profit for the year from continuing operations 625,733   (147,329) (154,926)
Other comprehensive income, net of income tax 28,843   23,143 5,732
Total comprehensive income for the year $ 654,576   $ (124,186) $ (149,194)