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Material partly-owned subsidiaries (Details) - PEN (S/) S/ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 01, 2017
Disclosure of subsidiaries [line items] |  |  |  |
Accumulated balances of material non-controlling interest | S/ 148 | S/ 112,589 |  |
Loss allocated to material non-controlling interest | S/ 13,151 | S/ 3,280 | S/ 3,865 |
Fosfatos del Pacifico S.A. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Proportion of equity interest held by non-controlling interests |  | 30.00% |  |
Accumulated balances of material non-controlling interest |  | S/ 100,722 |  | S/ 100,357
Loss allocated to material non-controlling interest | S/ 365 | S/ 2,703 | 2,992 |
Salmueras Sudamericanas S.A. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Proportion of equity interest held by non-controlling interests | 25.10% | 25.10% |  |
Accumulated balances of material non-controlling interest | S/ 147 | S/ 11,867 |  |
Loss allocated to material non-controlling interest | S/ 12,786 | S/ 577 | S/ 873 |

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- Definition The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 12 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_12_f&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph q -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_q&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 10 -IssueDate 2017-01-01 -Paragraph 22 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=10&date=2017-03-01&anchor=para_22&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The profit (loss) attributable to non-controlling interests. [Refer: Profit (loss); Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 12 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_12_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 81B -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_81B_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 12 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_12_c&doctype=Standard -URIDate 2017-03-09 + Details
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