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Financial risk management, objectives and policies (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of risk management strategy related to hedge accounting [line items]      
Effect on profit before tax S/ 128,417 S/ 198,110 S/ 306,770
Change in exchange rate +5 [Member] | Foreign Currency Risk [Member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Effect on profit before tax (620) (605)  
Change in exchange rate +10 [Member] | Foreign Currency Risk [Member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Effect on profit before tax (1,239) (1,209)  
Change in exchange rate -5 [Member] | Foreign Currency Risk [Member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Effect on profit before tax 620 605  
Change in exchange rate -10 [Member] | Foreign Currency Risk [Member]      
Disclosure of risk management strategy related to hedge accounting [line items]      
Effect on profit before tax S/ 1,239 S/ 1,209