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Shareholders’ equity, net (Details)
S/ in Thousands, $ in Thousands
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2017
PEN (S/)
shares
Dec. 31, 2016
USD ($)
Disclosure of Shareholders’ equity, net [Line Items]      
Capital stock | $ $ 750,497   $ 750,497
Common shares [member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Number of shares 274,889,924 274,889,924  
Capital stock $ 813,162 S/ 2,748,899  
Treasury shares [member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Number of shares (21,174,734) (21,174,734)  
Capital stock $ (62,665) S/ (211,747)  
Total Shares [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Number of shares 253,715,190 253,715,190  
Capital stock $ 750,497 S/ 2,537,152