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Trade and other receivables (Details 1) - PEN (S/)
S/ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Changes In Allowance Account For Credit Losses Of Financial Assets [Roll Forward]      
Opening balance S/ 781 S/ 667 S/ 352
Additions 1,190 114 315
Write-off (286)    
Ending balance S/ 1,685 S/ 781 S/ 667