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Investment Properties - Summary of Investment Properties, Fair Value (Detail) $ in Thousands, $ in Thousands | Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
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Disclosure of detailed information about investment property [line items] |  |  |  |
Fair value | $ 20,055,044 | $ 611,621 | $ 20,169,116 | $ 21,729,092
Fair value [member] | Level 3 of fair value hierarchy [member] |  |  |  |
Disclosure of detailed information about investment property [line items] |  |  |  |
Fair value | $ 34,684,323 | $ 1,057,771 | $ 34,789,532 |

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- Definition The amount of property (land or a building - or part of a building - or both) held (by the owner or by the lessee as a right-of-use asset) to earn rentals or for capital appreciation or both, rather than for: (a) use in the production or supply of goods or services or for administrative purposes; or (b) sale in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2024-01-01 -Paragraph 76 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_76&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_79_d&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_b&doctype=Standard -URIDate 2024-03-27 + Details
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