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Investments accounted for using equity method - Additional Information (Detail) shares in Thousands, $ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2024 TWD ($) | Apr. 30, 2023 TWD ($) shares | Dec. 31, 2023 TWD ($) | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($)
Disclosure of associates [line items] |  |  |  |  |
Carrying amount of investment in associates |  |  | $ 290,542 | $ 320,213 | $ 9,766
Acquisition of financial assets at fair value through other comprehensive income |  |  | (12,500) |  |
Individually Immaterial Associates [member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Carrying amount of investment in associates |  |  | 290,542 | 320,213 |
JMC ELECTRONICS CO., LTD. [member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Investment in associates at fair value |  |  | 303,780 | 303,365 |
Carrying amount of investment in associates |  |  | 277,076 | 293,089 |
Daypower Energy [member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Carrying amount of investment in associates |  |  | $ 13,466 | $ 27,124 |
Daypower Energy [member] | Ordinary shares [member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Number of shares acquired | shares |  | 1,000 |  |  |
Amount of shares acquired value | $ 12,500 | $ 12,500 |  |  |
Acquired Percentage Of Shareholdings |  | 10.00% |  |  |

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