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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)

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