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Selling and distribution expenses (Details) - PEN (S/)
S/ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Selling And Distribution Expenses      
Advertising and promotion S/ 18,955 S/ 15,631 S/ 8,410
Personnel expenses, note 21(b) 17,982 17,096 16,230
Third-party services 7,392 4,551 4,596
Provision for doubtful accounts, note 7(d) 1,190 114 315
Other 1,048 2,507 1,930
Total selling and distribution expenses S/ 46,567 S/ 39,899 S/ 31,481