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Subsidiaries with material non-controlling interest (Details Textual)
S/ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
PEN (S/)
Dec. 31, 2015
USD ($)
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Payments from changes in ownership interests in subsidiaries that do not result in loss of control $ 621,000 $ 5,459,000   $ 0
Increasedecrease in proportion of ownership interest in subsidiaries that result in dilution of non controlling interests 0.09% 7.26% 7.26%  
Purchase Of Shares Value $ 621,000      
Increasedecrease of ownership interest in subsidiaries that result in dilution of non controlling interests   $ 5,400,000    
Investment one [Member] | Peruvian Soles [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Payments from changes in ownership interests in subsidiaries that do not result in loss of control | S/     S/ 63.9  
Investment one [Member] | US dollars [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Payments from changes in ownership interests in subsidiaries that do not result in loss of control   18,600,000    
Investment two [Member] | US dollars [Member]        
Disclosure Of Subsidiaries with material non-controlling interest [Line Items]        
Payments from changes in ownership interests in subsidiaries that do not result in loss of control   $ 45,200,000