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Standards issued but not yet effective (Details 1) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of expected impact of initial application of new standards or interpretations [line items]      
Sales of goods S/ 1,225,639 S/ 1,240,169 S/ 1,231,015
Attributable to      
Equity holders of the parent 93,782 116,174 215,532
Non-controlling interests (13,151) (3,280) (3,865)
Net impact 80,631 S/ 112,894 S/ 211,667
IFRS 15 Revenue from Contracts with Customers [Member]      
Disclosure of expected impact of initial application of new standards or interpretations [line items]      
Sales of goods (4,717,000)    
Selling and distribution expenses 4,717,000    
Net impact on profit for the year    
Attributable to      
Equity holders of the parent (4,717,000)    
Non-controlling interests    
Net impact S/ (4,717,000)