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Material partly-owned subsidiaries (Details 3) - PEN (S/) S/ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of subsidiaries [line items] |  |  |
Net cash flows used in operating activities | S/ 250,408 | S/ 241,679 | S/ 275,644
Net cash flows (used in) provided from investing activities | (70,639) | (135,627) | (475,867)
Net cash flows provided from financing activities | (185,426) | (177,537) | (257,809)
Fosfatos del Pacifico S.A. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Net cash flows used in operating activities | (2,611) | (17,332) | (21,950)
Net cash flows (used in) provided from investing activities | (6,410) | (22,352) | (55,495)
Net cash flows provided from financing activities | 5,953 | 39,200 | 82,676
Net (decrease) increase in cash and cash equivalents | (3,068) | (484) | 5,231
Salmueras Sudamericanas S.A. [Member] |  |  |
Disclosure of subsidiaries [line items] |  |  |
Net cash flows used in operating activities | (4,134) | (3,870) | (4,490)
Net cash flows (used in) provided from investing activities |  | 83 |
Net cash flows provided from financing activities | 4,250 | 4,100 | 2,400
Net (decrease) increase in cash and cash equivalents | S/ 116 | S/ 313 | S/ (2,090)

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- Definition The cash flows from (used in) financing activities, which are activities that result in changes in the size and composition of the contributed equity and borrowings of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_10&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_50_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The cash flows from (used in) investing activities, which are the acquisition and disposal of long-term assets and other investments not included in cash equivalents. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_10&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_50_d&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The cash flows from (used in) operating activities, which are the principal revenue-producing activities of the entity and other activities that are not investing or financing activities. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_10&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2017-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_50_d&doctype=Standard -URIDate 2017-03-09 + Details
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