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Interest-bearing loans and borrowings (Details) - PEN (S/)
S/ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]    
Principal, net of issuance costs S/ 965,290 S/ 998,148
Senior Notes [Member]    
Disclosure of detailed information about borrowings [line items]    
Nominal interest rate 4.50%  
Maturity date Feb 8, 2023  
Principal, net of issuance costs S/ 965,290 998,148
Total non-current loans S/ 965,290 S/ 998,148