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Commitments and contingencies (Details)	12 Months Ended
	Dec. 31, 2017
Disclosure of subsidiaries [line items]
Income tax	2012-2017
Value-added tax	Dec. 2013-2017
Cementos Selva S.A. [Member]
Disclosure of subsidiaries [line items]
Income tax	2013-2017
Value-added tax	Dec. 2013-2017
Distribuidora Norte Pacasmayo S.R.L. [Member]
Disclosure of subsidiaries [line items]
Income tax	2012-2017
Value-added tax	Dec. 2013-2017
Empresa de Transmision Guadalupe S.A.C. [Member]
Disclosure of subsidiaries [line items]
Income tax	2013-2017
Value-added tax	Dec. 2013-2017
Salmueras Sudamericanas S.A. [Member]
Disclosure of subsidiaries [line items]
Income tax	2013-2017
Value-added tax	Dec. 2013-2017
Calizas del Norte S.A.C. [Member]
Disclosure of subsidiaries [line items]
Income tax	2013-2017
Value-added tax	2013-2017

X

- Definition

Description of income tax year.

+ References

No definition available.

+ Details

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X

- Definition

Description of value added tax.

+ References

No definition available.

+ Details

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X

- 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.

+ Details

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- Details

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X

- Details

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X

- Details

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X

- Details

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Data Type:	na
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X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cpac_CalizasDelNorteSACMember
Namespace Prefix:
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