Other Comprehensive Income - Summary of Accumulated Other Comprehensive Income Loss (Parenthetical) (Detail) S/ in Millions	12 Months Ended
Dec. 31, 2018 PEN (S/)
CAM Chile S.A. [member]
Disclosure of analysis of other comprehensive income by item [line items]
Transfer to profit or loss (Note 10)	S/ 14.8

The amount of income tax relating to amounts recognised in other comprehensive income that will be reclassified to profit or loss. [Refer: Income tax relating to components of other comprehensive income]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 91
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_91&doctype=Standard
-URIDate 2019-03-27

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration