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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, 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

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