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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
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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)

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