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Other equity interest - Summary of Other Equity Interest (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 Other Equity Interest [Line Items] |  |  |  |
Beginning balance | $ 228,283 |  |  |
Evaluation adjustment - The Company | (217,785) | $ (7,113) | $ (46,419) | $ 122,514
Ending balance | 48,360 | $ 1,579 | 228,283 |
Financial statements translation differences of foreign operations [member] |  |  |  |
Disclosure of Other Equity Interest [Line Items] |  |  |  |
Beginning balance | (17,369) |  | (86,025) | (61,330)
Currency translation differences - The company | 16,713 |  | 68,656 | (24,695)
Ending balance | (656) |  | (17,369) | (86,025)
Unrealized gain (loss) on valuation of financial assets at fair value through other comprehensive income [member] |  |  |  |
Disclosure of Other Equity Interest [Line Items] |  |  |  |
Beginning balance | 245,652 |  | 307,865 | 194,716
Evaluation adjustment - The Company | (217,785) |  | (46,419) | 122,514
Evaluation adjustment - Associates | 12,605 |  | (28,353) | 21,094
Evaluation adjustment related tax - The Company | 51,638 |  | 12,559 | (30,459)
Ending balance | 92,110 |  | 245,652 | 307,865
Equity directly related to non-current assets held for sale [member] |  |  |  |
Disclosure of Other Equity Interest [Line Items] |  |  |  |
Currency translation differences - Non-current assets held for sale | (43,094) |  |  |
Ending balance | (43,094) |  |  |
Other equity interest [member] |  |  |  |
Disclosure of Other Equity Interest [Line Items] |  |  |  |
Beginning balance | 228,283 |  | 221,840 | 133,386
Currency translation differences - The company | 16,713 |  | 68,656 | (24,695)
Currency translation differences - Non-current assets held for sale | (43,094) |  |  |
Evaluation adjustment - The Company | (217,785) |  | (46,419) | 122,514
Evaluation adjustment - Associates | 12,605 |  | (28,353) | 21,094
Evaluation adjustment related tax - The Company | 51,638 |  | 12,559 | (30,459)
Ending balance | $ 48,360 |  | $ 228,283 | $ 221,840

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- Definition The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, net of tax, before reclassification adjustments. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 91 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_91_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The gains (losses) recognised in other comprehensive income on financial assets measured at fair value through other comprehensive income applying paragraph 4.1.2A of IFRS 9, before tax, before reclassification adjustments. [Refer: Financial assets measured at fair value through other comprehensive income; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_91_b&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 20 -Subparagraph a -Clause viii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_20_a_viii&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of equity interest of an entity without share capital that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_e&doctype=Standard -URIDate 2023-03-23 + Details
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