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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
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