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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Legal reserve [member] |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Appropriation of retained earnings | $ 505,482 | $ 232,611 | $ 258,416
Special Reserve [Member] |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Appropriation of retained earnings |  | (19,802) | 19,802
Cash Dividend [Member] |  |  |
Disclosure of analysis of other comprehensive income by item [line items] |  |  |
Appropriation of retained earnings | $ 3,127,133 | $ 1,599,928 | $ 1,309,032
Cash dividend, cash distribution per share | $ 4.30 | $ 2.20 | $ 1.80

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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 2022-03-24 -Paragraph 106 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_106_d&doctype=Standard -URIDate 2022-03-24 + Details
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