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Equity - Summary of Appropriations of Earnings (Detail) - TWD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of classes of share capital [line items]
Cash dividends	$ (11,415,198)	$ (12,476,779)	$ (15,589,825)
Appropriations of earnings	(11,415,198)	$ (12,476,779)	$ (15,589,825)
Cash dividends		$ 1.40	$ 1.60
Unappropriated earnings [member]
Disclosure of classes of share capital [line items]
Legal reserve	(2,168,034)	$ (1,947,887)	$ (2,359,267)
Cash dividends	(11,415,198)	(12,476,779)	(15,589,825)
Appropriations of earnings	$ (13,583,232)	$ (14,424,666)	$ (17,949,092)

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

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- Definition

The amount of dividends paid per ordinary share.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of dividends recognised as distributions to owners of the parent. [Refer: Parent [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
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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 2017-01-01
-Paragraph 106
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- Definition

The increase (decrease) in equity resulting from transfers to a statutory reserve. [Refer: Statutory reserve]

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