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Financial risk management - Summary of Net Monetary Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ (587,462) $ (562,029)
Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (21,757) (21,958)
Brazilian Reais    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 35,884 (17,134)
US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (600,680) (521,836)
Uruguay, Pesos    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (909) (1,101)
Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (282,129) (226,404)
Argentine Peso | Argentine Peso    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (21,757) (21,958)
Argentine Peso | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (260,372) (204,446)
Brazilian Reais    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (444,617) (479,100)
Brazilian Reais | Brazilian Reais    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 35,884 (17,134)
Brazilian Reais | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (480,501) (461,966)
Uruguay, Pesos    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 23,603 19,350
Uruguay, Pesos | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 24,512 20,451
Uruguay, Pesos | Uruguay, Pesos    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic (909) (1,101)
US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic 115,681 124,125
US Dollar | US Dollar    
Disclosure of detailed information about financial instruments [line items]    
Risk exposure associated with instruments sharing characteristic $ 115,681 $ 124,125