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Interest-bearing loans and borrowings (Details Narrative)
S/ in Thousands, $ in Thousands
 12 Months Ended
Feb. 01, 2013
USD ($)
Feb. 01, 2013
PEN (S/)
Dec. 31, 2017
PEN (S/)
Dec. 31, 2016
PEN (S/)
Dec. 31, 2015
PEN (S/)
Disclosure of detailed information about borrowings [line items]          
Accrued interest | S/     S/ 45,358 S/ 44,729 S/ 8,108
Senior Notes [Member]          
Disclosure of detailed information about borrowings [line items]          
Total net proceeds from borowing | S/   S/ 762,067      
Senior Notes [Member] | USD          
Disclosure of detailed information about borrowings [line items]          
Face amount | $ $ 300,000        
Total net proceeds from borowing | $ $ 293,646