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Shareholders' equity, net - Capital stock (Details)
S/ in Thousands, $ in Thousands
Dec. 31, 2020
PEN (S/)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
Disclosure of Shareholders' equity, net [Line Items]      
Number of shares (350,056,012) (350,056,012)  
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 S/ (2,748,899) $ (813,162)  
Treasury shares [member]      
Disclosure of Shareholders' equity, net [Line Items]      
Number of shares (21,174,734) (21,174,734)  
Capital stock S/ (211,747) $ (62,665)  
Total Shares [Member]      
Disclosure of Shareholders' equity, net [Line Items]      
Number of shares (253,715,190) (253,715,190)  
Capital stock S/ (2,537,152) $ (750,497)