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Financial assets and financial liabilities (Details 2) - PEN (S/)
S/ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of fair value measurement of assets [line items]      
Derivative financial instruments - Cross currency swaps S/ 489 S/ 69,912 S/ 124,770
Available-for-sale financial investments 21,206 657 S/ 436
Total financial assets - non-current [1] 3,221 5,639  
Fair Value [Member]      
Disclosure of fair value measurement of assets [line items]      
Derivative financial instruments - Cross currency swaps 489 69,912  
Available-for-sale financial investments 21,206 657  
Total financial assets - non-current 21,695 70,569  
Fair Value [Member] | Senior Notes [Member]      
Disclosure of fair value measurement of assets [line items]      
Total financial liabilities 1,005,324 1,012,607  
Carrying Amount [Member]      
Disclosure of fair value measurement of assets [line items]      
Derivative financial instruments - Cross currency swaps 489 69,912  
Available-for-sale financial investments 657  
Total financial assets - non-current 489 70,569  
Carrying Amount [Member] | Senior Notes [Member]      
Disclosure of fair value measurement of assets [line items]      
Total financial liabilities S/ 965,290 S/ 998,148  
[1] The aging analysis of trade and other accounts receivable as of December 31, 2017 and 2016, is as follows: