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Available-for-sale financial investments (Details Narrative) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 14, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial assets [line items]        
Proceeds from sale of available for sale financial investments   S/ 694
Financial Assets Available-for-Sale, Category [Member] | Equity Investments [Member] | Union Andina de Cementos S.A.A. [Member]        
Disclosure of financial assets [line items]        
Number of shares   9,148,373 [1] 256,624 [2]  
Proceeds from sale of available for sale financial investments S/ 694      
Gain from sale of available for sale financial investments S/ 243      
[1] Represents 7.76% of its common shares.
[2] Represents 0.016% of its common shares.