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Financial assets and financial liabilities (Details 1) - PEN (S/)
S/ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial assets [line items]      
Financial assets S/ 489 S/ 70,569  
Currency swap contract [Member]      
Disclosure of financial assets [line items]      
Financial assets 489 69,912 S/ 124,770
Financial liabilities  
Hedging instruments [Member] | Currency swap contract [Member]      
Disclosure of financial assets [line items]      
Financial assets 489 69,912  
Financial liabilities