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Corporate information (Details 4) - PEN (S/) S/ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Disclosure of subsidiaries [line items] |  |  |  |
Total assets | S/ 2,814,115 | S/ 3,320,623 | S/ 3,413,794 |
Liabilities | 1,307,407 | 1,340,594 | 1,367,660 |
Net equity | 1,506,708 | 1,980,029 | 2,046,134 | S/ 2,070,685
Net income (loss) | 93,782 | 116,174 | 215,532 |
Cementos Selva S.A. and subsidiaries [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Total assets | 244,386 | 260,927 |  |
Liabilities | 34,969 | 36,477 |  |
Net equity | 209,417 | 224,450 |  |
Net income (loss) | 37,467 | 37,361 | 244,386 |
Fosfatos del Pacifico S.A. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Total assets |  | 339,236 |  |
Liabilities |  | 3,495 |  |
Net equity |  | 335,741 |  |
Net income (loss) | (1,216) | (9,010) |  |
Distribuidora Norte Pacasmayo S.R.L. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Total assets | 243,568 | 211,787 |  |
Liabilities | 119,182 | 87,182 |  |
Net equity | 124,386 | 124,605 |  |
Net income (loss) | (220) | 11,242 | 243,568 |
Empresa de Transmision Guadalupe S.A.C. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Total assets | 42,136 | 49,339 |  |
Liabilities | 1,397 | 724 |  |
Net equity | 40,739 | 48,615 |  |
Net income (loss) | 124 | 504 | 42,136 |
Salmueras Sudamericanas S.A. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Total assets | 587 | 47,661 |  |
Liabilities |  | 382 |  |
Net equity | 587 | 47,279 |  |
Net income (loss) | (50,942) | (2,300) | 587 |
Calizas del Norte S.A.C. [Member] |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Total assets | 713 | 1,219 |  |
Liabilities | 7 | 409 |  |
Net equity | 706 | 810 |  |
Net income (loss) | S/ (121) | S/ 407 | S/ 713 |

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