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Borrowings - Maturity of borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of detailed information about borrowings [line items]      
Total debt $ 817,958 $ 635,396 $ 723,339
Brazilian Subsidiaries      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate basis 1.84% 1.32%  
Brazilian Subsidiaries | Bottom of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, adjustment to interest rate basis 4.13%    
Brazilian Subsidiaries | Top of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, adjustment to interest rate basis 17.52%    
Fixed interest rate | Brazilian Subsidiaries | Bottom of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 2.50%    
Fixed interest rate | Brazilian Subsidiaries | Top of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 9.00%    
Fixed interest rate | US Dollar | Argentina Subsidiaries | Bottom of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 6.11%    
Fixed interest rate | US Dollar | Argentina Subsidiaries | Top of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 7.00%    
Fixed interest rate | Argentine Peso | Argentina Subsidiaries | Bottom of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 9.90%    
Fixed interest rate | Argentine Peso | Argentina Subsidiaries | Top of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 28.75%    
Borrowings excluding obligations under finance lease      
Disclosure of detailed information about borrowings [line items]      
Total debt $ 817,853 $ 635,215  
Borrowings excluding obligations under finance lease | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 721,051 214,571  
Borrowings excluding obligations under finance lease | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 96,802 420,644  
Borrowings excluding obligations under finance lease | Less than 1 year | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 132,998 67,682  
Borrowings excluding obligations under finance lease | Less than 1 year | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 21,833 137,331  
Borrowings excluding obligations under finance lease | Between 1 and 2 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 35,762 43,630  
Borrowings excluding obligations under finance lease | Between 1 and 2 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 22,871 150,517  
Borrowings excluding obligations under finance lease | Between 2 and 3 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 20,097 40,047  
Borrowings excluding obligations under finance lease | Between 2 and 3 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 17,945 81,947  
Borrowings excluding obligations under finance lease | Between 3 and 4 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 20,130 21,857  
Borrowings excluding obligations under finance lease | Between 3 and 4 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 18,215 18,457  
Borrowings excluding obligations under finance lease | Between 4 and 5 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 16,310 21,116  
Borrowings excluding obligations under finance lease | Between 4 and 5 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 11,164 18,309  
Borrowings excluding obligations under finance lease | Over 5 Years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 495,754 20,239  
Borrowings excluding obligations under finance lease | Over 5 Years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt $ 4,774 $ 14,083