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Equity - Schedule of appropriation of retained earnings (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 $ / shares | Dec. 31, 2017 TWD ($)
Appropriation of earnings | $ 16,559,193 | $ 553,634 |  | $ (11,415,198)
Dividends per share | (per share) |  | $ 0.1 | $ 2.50 |
Legal reserve [member] |  |  |  |
Appropriation of earnings | 2,203,895 | $ 73,684 |  | $ 2,168,034
Special reserve [member] |  |  |  |
Appropriation of earnings | 3,548,844 | 118,651 |  |
Cash dividends [member] |  |  |  |
Appropriation of earnings | $ 10,806,454 | $ 361,299 |  |

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- Definition The amount of dividends paid per ordinary share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 34 -IssueDate 2019-01-01 -Paragraph 16A -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=34&code=ifrs-tx-2019-en-r&anchor=para_16A_f&doctype=Standard -URIDate 2019-03-27 + Details
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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 2019-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard -URIDate 2019-03-27 + Details
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