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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, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Disclosure of Other Equity Interest [Line Items] |  |  |  |
Beginning balance | $ 133,386 |  |  |
Ending balance | 221,840 | $ 7,997 | $ 133,386 |
Financial statements translation differences of foreign operations [member] |  |  |  |
Disclosure of Other Equity Interest [Line Items] |  |  |  |
Beginning balance | (61,330) |  | (89,682) | $ 14,516
Currency translation differences - The company | (24,695) |  | 28,352 | (104,198)
Ending balance | (86,025) |  | (61,330) | (89,682)
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 | 194,716 |  | 66,386 | 106,898
Evaluation adjustment - The Company | 122,514 |  | 140,199 | (52,549)
Evaluation adjustment - Associates | 21,094 |  | 22,925 | 5,093
Evaluation adjustment related tax - The Company | (30,459) |  | (34,794) | 7,016
Disposal of investment accounted for using equity method |  |  |  | (72)
Ending balance | 307,865 |  | 194,716 | 66,386
Unearned employee awards [member] |  |  |  |
Disclosure of Other Equity Interest [Line Items] |  |  |  |
Beginning balance |  |  |  | (1,701)
Employee restricted shares - The company |  |  |  | 1,701
Other equity interest [member] |  |  |  |
Disclosure of Other Equity Interest [Line Items] |  |  |  |
Beginning balance | 133,386 |  | (23,296) | 119,713
Currency translation differences - The company | (24,695) |  | 28,352 | (104,198)
Employee restricted shares - The company |  |  |  | 1,701
Evaluation adjustment - The Company | 122,514 |  | 140,199 | (52,549)
Evaluation adjustment - Associates | 21,094 |  | 22,925 | 5,093
Evaluation adjustment related tax - The Company | (30,459) |  | (34,794) | 7,016
Disposal of investment accounted for using equity method |  |  |  | (72)
Ending balance | $ 221,840 |  | $ 133,386 | $ (23,296)

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- Definition Adjustments for gain (loss) on disposals investments in subsidiaries, joint ventures and associates to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries, joint ventures and associates reported in separate financial statements; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_20&doctype=Standard -URIDate 2021-03-24 + Details
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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 2021-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_91_a&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition A component of equity resulting from share-based payments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_e&doctype=Standard -URIDate 2021-03-24 + Details
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