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Financial assets and financial liabilities (Details) - PEN (S/)
S/ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial assets [line items]      
Derivative financial instruments - Cross currency swaps S/ 489 S/ 69,912 S/ 124,770
Total financial instruments at fair value 21,206 657 436
Total current [1] 97,299 77,740  
Total non-current [1] 3,221 5,639  
Financial assets 489 70,569  
Currency swap contract [Member]      
Disclosure of financial assets [line items]      
Derivative financial instruments - Cross currency swaps 489 69,912 124,770
Financial assets 489 69,912 S/ 124,770
Quoted Equity Shares [Member]      
Disclosure of financial assets [line items]      
Derivative financial instruments - Cross currency swaps 657  
Total financial instruments at fair value 657  
Financial Assets Available-for-Sale, Category [Member]      
Disclosure of financial assets [line items]      
Derivative financial instruments - Cross currency swaps 657  
Cash Flow Hedges [Member]      
Disclosure of financial assets [line items]      
Derivative financial instruments - Cross currency swaps 489 69,912  
Cash Flow Hedges [Member] | Currency swap contract [Member]      
Disclosure of financial assets [line items]      
Derivative financial instruments - Cross currency swaps S/ 489 S/ 69,912  
[1] The aging analysis of trade and other accounts receivable as of December 31, 2017 and 2016, is as follows: