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Segment information (Details Narrative) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of major customers [line items]      
Revenue S/ 1,225,639 S/ 1,240,169 S/ 1,231,015
Capital expenditures 69,732 117,801 490,807
Total financial instruments at fair value 21,206 657 436
Derivative financial instruments 489 69,912 124,770
Quicklime [Member]      
Disclosure of major customers [line items]      
Revenue 80,707 75,090 64,140
Capital expenditures  
Quicklime [Member] | Two Customers [Member]      
Disclosure of major customers [line items]      
Revenue S/ 65,784    
Quicklime [Member] | One Customer [Member]      
Disclosure of major customers [line items]      
Revenue   S/ 55,657 S/ 27,182