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Material partly-owned subsidiaries (Details 1) - PEN (S/)
S/ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of subsidiaries [line items]        
Cost of sales   S/ (732,956) S/ (736,530) S/ (695,757)
Administrative expenses   (195,617) (193,376) (179,723)
Profit before income tax   128,417 198,110 306,770
Income tax expense   (47,032) (78,627) (89,383)
Total comprehensive loss   53,534 84,643 218,172
Attributable to non-controlling interest   (13,151) (3,280) (3,865)
Fosfatos del Pacifico S.A. [Member]        
Disclosure of subsidiaries [line items]        
Sales of goods   11 1,965  
Cost of sales S/ (626) (626) (6,881)
Administrative expenses   (1,068) (8,694) (11,775)
Other income (expenses) S/ 153 153 (1,006) (212)
Finance (expense) income   (237) (793) (1,126)
Profit before income tax   (1,767) (15,409) (13,113)
Income tax expense   551 6,399 3,141
Total comprehensive loss   (1,216) (9,010) (9,972)
Attributable to non-controlling interest   (365) (2,703) (2,992)
Salmueras Sudamericanas S.A. [Member]        
Disclosure of subsidiaries [line items]        
Sales of goods    
Cost of sales    
Administrative expenses   (3,864) (3,829) (4,257)
Other income (expenses)   (40,816) 52 (2)
Finance (expense) income   3 (114) 14
Profit before income tax   (44,677) (3,891) (4,245)
Income tax expense   (6,265) 1,591 767
Total comprehensive loss   (50,942) (2,300) (3,478)
Attributable to non-controlling interest   S/ (12,786) S/ (577) S/ (873)