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Financial risk management - Currency Appreciation/Depreciation Effects on Net Monetary Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ (562,029) $ (481,676)
US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (521,836) (280,089)
Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (226,404) (42,570)
Argentine Peso | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (204,446) (44,088)
Brazilian Reais    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (479,100) (510,158)
Brazilian Reais | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (461,966) (307,088)
Uruguay, Pesos    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 19,350 (7,749)
Uruguay, Pesos | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 20,451 (7,714)
US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 124,125 78,801
US Dollar | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 124,125 78,801
Currency risk | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (64,597) (35,889)
Currency risk | Argentine Peso | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (20,445) (4,409)
Currency risk | Brazilian Reais | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (46,197) (30,709)
Currency risk | Uruguay, Pesos | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 2,045 $ (771)