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Financial risk management, objectives and policies (Details 4) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes In Liabilities Arising From Financing Activities [RollForward]      
Amortization of costs of issuance of senior notes S/ 1,644 S/ 1,644 S/ 1,644
Hedge Finance Cost Payable [Member]      
Changes In Liabilities Arising From Financing Activities [RollForward]      
Balance as of beginning 11,073 10,897  
Distribution of dividends  
Finance cost on cross currency swaps 26,140 27,800  
Cash flows (26,708) (27,624)  
Movement of foreign currency  
Amortization of costs of issuance of senior notes  
Others  
Balance as of end 10,505 11,073 10,897
Dividends Payable [Member]      
Changes In Liabilities Arising From Financing Activities [RollForward]      
Balance as of beginning 5,070 4,235  
Distribution of dividends 149,837 155,236  
Finance cost on cross currency swaps  
Cash flows (124,993) (154,401)  
Movement of foreign currency  
Amortization of costs of issuance of senior notes  
Others (189)  
Balance as of end 29,725 5,070 4,235
Interest-bearing Loans [Member]      
Changes In Liabilities Arising From Financing Activities [RollForward]      
Balance as of beginning 998,148 1,012,406  
Distribution of dividends  
Finance cost on cross currency swaps  
Cash flows  
Movement of foreign currency (34,502) (15,902)  
Amortization of costs of issuance of senior notes 1,644 1,644  
Others  
Balance as of end S/ 965,290 S/ 998,148 S/ 1,012,406