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Available-for-sale financial investments (Details 1) - PEN (S/)
S/ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of financial assets [line items]        
Cost S/ 489 S/ 70,569    
Unrealized gain   207    
Available-for-sale financial investments 21,206 657 S/ 436  
Financial Assets Available-for-Sale, Category [Member]        
Disclosure of financial assets [line items]        
Available-for-sale financial investments S/ 21,206 657 S/ 436 S/ 744
Financial Assets Available-for-Sale, Category [Member] | Equity Investments [Member] | Union Andina de Cementos S.A.A. [Member]        
Disclosure of financial assets [line items]        
Cost   450    
Unrealized gain   207    
Available-for-sale financial investments   S/ 657