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Material partly-owned subsidiaries (Details 2) - PEN (S/) S/ in Thousands | Dec. 31, 2017 | Mar. 01, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Disclosure of subsidiaries [line items] |  |  |  |  |
Total equity | S/ 1,506,708 |  | S/ 1,980,029 | S/ 2,046,134 | S/ 2,070,685
Attributable to: |  |  |  |  |
Equity holders of parent | 1,506,560 |  | 1,867,440 |  |
Non-controlling interest | 148 |  | 112,589 |  |
Fosfatos del Pacifico S.A. [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Cash, inventories and other current assets |  |  | 14,450 |  |
Other receivables, property, plant and equipment and other non-current assets |  |  | 324,786 |  |
Trade and other payables current |  |  | (3,495) |  |
Total equity |  |  | 335,741 |  |
Attributable to: |  |  |  |  |
Equity holders of parent |  |  | 235,019 |  |
Non-controlling interest |  | S/ 100,357 | 100,722 |  |
Salmueras Sudamericanas S.A. [Member] |  |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |  |
Cash, inventories and other current assets | 587 |  | 593 |  |
Other receivables, property, plant and equipment and other non-current assets |  |  | 47,068 |  |
Trade and other payables current |  |  | (382) |  |
Total equity | 587 |  | 47,279 |  |
Attributable to: |  |  |  |  |
Equity holders of parent | 440 |  | 35,412 |  |
Non-controlling interest | S/ 147 |  | S/ 11,867 |  |

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