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Shareholders’ equity, net (Details 1)
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]      
Other equity interest | $ $ 791   $ 791
Total investment shares [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Number of shares outstanding 271,677 271,677  
Other equity interest $ 791 S/ 2,717  
Other equity interest [member] | investment shares [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Number of shares outstanding 744,640 744,640  
Other equity interest $ 2,161 S/ 7,447  
Other equity interest [member] | Treasury investment shares [Member]      
Disclosure of Shareholders’ equity, net [Line Items]      
Number of shares outstanding (472,963) (472,963)  
Other equity interest $ (1,370) S/ (4,730)