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Borrowings - Maturity of borrowings (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]      
Total debt $ 862,116 $ 817,958 $ 635,396
Brazilian Subsidiaries      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate basis 2.88% 1.84%  
Brazilian Subsidiaries | Bottom of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, adjustment to interest rate basis 6.89%    
Brazilian Subsidiaries | Top of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, adjustment to interest rate basis 12.03%    
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 8.00%    
Fixed interest rate | US Dollar | Argentina Subsidiaries | Bottom of range      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate 4.50%    
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 62.00%    
Borrowings excluding obligations under finance lease      
Disclosure of detailed information about borrowings [line items]      
Total debt $ 861,521 $ 817,853  
Borrowings excluding obligations under finance lease | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 723,077 721,051  
Borrowings excluding obligations under finance lease | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 138,444 96,802  
Borrowings excluding obligations under finance lease | Less than 1 year | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 105,708 132,998  
Borrowings excluding obligations under finance lease | Less than 1 year | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 37,724 21,833  
Borrowings excluding obligations under finance lease | Between 1 and 2 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 16,287 35,762  
Borrowings excluding obligations under finance lease | Between 1 and 2 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 17,278 22,871  
Borrowings excluding obligations under finance lease | Between 2 and 3 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 25,704 20,097  
Borrowings excluding obligations under finance lease | Between 2 and 3 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 29,861 17,945  
Borrowings excluding obligations under finance lease | Between 3 and 4 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 43,507 20,130  
Borrowings excluding obligations under finance lease | Between 3 and 4 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 22,886 18,215  
Borrowings excluding obligations under finance lease | Between 4 and 5 years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 26,415 16,310  
Borrowings excluding obligations under finance lease | Between 4 and 5 years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 18,251 11,164  
Borrowings excluding obligations under finance lease | Over 5 Years | Fixed interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt 505,456 495,754  
Borrowings excluding obligations under finance lease | Over 5 Years | Variable interest rate      
Disclosure of detailed information about borrowings [line items]      
Total debt $ 12,444 $ 4,774