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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
	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

X

- Definition

The amount of dividends paid per ordinary share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 34
-IssueDate 2019-01-01
-Paragraph 16A
-Subparagraph f
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-URIDate 2019-03-27

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X

- 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
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-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

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