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Retained Earnings - Details of Retained Earnings (Detail) - TWD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Legal reserve [member] |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |
Appropriation of retained earnings | $ 146,812 | $ 190,237 | $ 354,986 | $ 505,482
Cash Dividend [Member] |  |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |  |
Appropriation of retained earnings | $ 872,688 | $ 1,309,032 | $ 1,672,652 | $ 3,127,133
Cash dividend, cash distribution per share | $ 1.2 | $ 1.8 | $ 2.3 | $ 4.3

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- Definition The increase (decrease) in equity resulting from the appropriation of retained earnings. [Refer: Retained earnings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_106_d&doctype=Standard -URIDate 2024-03-27 + Details
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