Financial Instruments - Additional Information (Detail) - CLP ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure Of Financial Liabilities [Abstract]
Gains or losses recognized	$ 0	$ 0	$ 0

The gains (losses) recognised in other comprehensive income on cash flow hedges, net of tax. [Refer: Cash flow hedges [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2016-01-13
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-Subparagraph c
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2016-01-13
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
-Name IFRS
-Number 7
-IssueDate 2016-01-13
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2018-01-01
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-IssueDate 2016-01-13
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