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Commitments and contingencies (Details Narrative 1) - PEN (S/) S/ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of contingent liabilities in business combination [line items]
Applicable tax rate	26.00%	27.00%	29.50%	28.00%	28.00%	30.00%
Other provisions			S/ 52,868	S/ 53,753	S/ 61,518
Legal claim contingency			16,570
Labor Claims From Former Employees [Member]
Disclosure of contingent liabilities in business combination [line items]
Legal claim contingency			1,687
Tax contingent liability [member]
Disclosure of contingent liabilities in business combination [line items]
Legal claim contingency			2,298
Tax Administration [Member]
Disclosure of contingent liabilities in business combination [line items]
Legal claim contingency				4,904
Property Tax Assessment for Periods 2009 to 2014 [Member]
Disclosure of contingent liabilities in business combination [line items]
Legal claim contingency			7,681
Rehabilitation Provision [Member]
Disclosure of contingent liabilities in business combination [line items]
Other provisions			S/ 2,399	S/ 2,367
Bottom of Range [Member]
Disclosure of contingent liabilities in business combination [line items]
Applicable tax rate profit after deducting employee participation			8.00%
Top of Range [Member]
Disclosure of contingent liabilities in business combination [line items]
Applicable tax rate profit after deducting employee participation			10.00%

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2017-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
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-URIDate 2017-03-09

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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

No definition available.

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- Definition

The amount of the estimated financial effect of contingent liabilities. [Refer: Contingent liabilities [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2017-01-01
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- Definition

The amount of provisions other than provisions for employee benefits. [Refer: Provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 37
-IssueDate 2017-01-01
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2017-01-01
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- Definition

The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the expenses not deductible in determining taxable profit. [Refer: Average effective tax rate; Applicable tax rate]

+ References

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