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Subsidiaries with material non-controlling interest (Details Textual)
$ in Thousands, S/ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
PEN (S/)
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 $ 0 $ 621 $ 5,459  
Increasedecrease in proportion of ownership interest in subsidiaries that result in dilution of non controlling interests   0.09% 7.26% 7.26%
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  
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