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Goodwill - Summary of Goodwill (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 reconciliation of changes in goodwill [line items] |  |  |  |
Beginning balance | $ 52,709,053 | $ 1,900,110 | $ 50,198,436 | $ 49,974,446
Acquisition through business combinations |  |  | 2,567,842 | 264,977
Disposal of subsidiaries | (310,711) | (11,201) |  |
Effect of foreign currency exchange differences | (325,929) | (11,749) | (57,225) | (40,987)
Ending balance | 52,072,413 | 1,877,160 | 52,709,053 | 50,198,436
Cost [member] |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Beginning balance | 55,123,166 | 1,987,136 | 52,612,549 | 52,388,559
Acquisition through business combinations |  |  | 2,567,842 | 264,977
Disposal of subsidiaries | (310,711) | (11,201) |  |
Effect of foreign currency exchange differences | (325,929) | (11,749) | (57,225) | (40,987)
Ending balance | 54,486,526 | 1,964,186 | 55,123,166 | 52,612,549
Accumulated impairment [Member] |  |  |  |
Disclosure of reconciliation of changes in goodwill [line items] |  |  |  |
Beginning balance | 2,414,113 | 87,026 | 2,414,113 | 2,414,113
Ending balance | $ 2,414,113 | $ 87,026 | $ 2,414,113 | $ 2,414,113

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- Definition The amount of additional goodwill recognised, except goodwill included in a disposal group that, on acquisition, meets the criteria to be classified as held for sale in accordance with IFRS 5. [Refer: Goodwill; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B67 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B67_d_ii&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition The decrease in goodwill due to classification as held for sale. [Refer: Goodwill; Disposal groups classified as held for sale [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B67 -Subparagraph d -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B67_d_iv&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B67_d&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 134 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_134_a&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2021-01-01 -Paragraph 135 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_135_a&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B67 -Subparagraph d -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B67_d_vi&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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