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Financial risk management - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jul. 31, 2016
BRL (R$)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Disclosure of major customers [line items]          
Percentage of sales designated for hedging activities 24.60% 18.10%      
Gain (loss) on hedge ineffectiveness recognised in other comprehensive income $ 530 $ (67,683)      
Reclassification adjustments on cash flow hedges for which hedged item affected profit or loss, net of tax (20,758) 85,214      
Cash and cash equivalents $ 269,195 $ 158,568   $ 198,894 $ 113,795
Gearing ratio 56.00% 49.00%      
Nominal amount $ 63,300 $ 111,800   $ 62,400  
Derivative financial liabilities 552 7,068      
Notional amount $ 130,069 $ 62,424      
Bottom of range          
Disclosure of major customers [line items]          
Gearing ratio 45.00%        
Top of range          
Disclosure of major customers [line items]          
Gearing ratio 60.00%        
Interest rate risk          
Disclosure of major customers [line items]          
Sensitivity analysis for types of market risk as a percentage 10000.00%        
Interest rate risk | Bradesco          
Disclosure of major customers [line items]          
Nominal amount | R$     R$ 90,000,000    
Interest rate risk | Floating interest rate          
Disclosure of major customers [line items]          
Sensitivity analysis for types of market risk as a percentage 1.00%        
Borrowings, interest rate     2.10%    
Interest rate risk | Fixed interest rate          
Disclosure of major customers [line items]          
Sensitivity analysis for types of market risk as a percentage   1.00%      
Borrowings, interest rate     6.55%    
Credit risk          
Disclosure of major customers [line items]          
Percentage of total cash deposited in major banks 78.00% 85.00%      
Credit risk | Crops          
Disclosure of major customers [line items]          
Percentage of sales 97.00% 95.00%      
Credit risk | Ethanol          
Disclosure of major customers [line items]          
Percentage of sales 100.00% 96.00%      
Credit risk | Sugar          
Disclosure of major customers [line items]          
Percentage of sales 87.00% 71.00%      
Credit risk | Crystal Sugar          
Disclosure of major customers [line items]          
Percentage of sales 13.00% 29.00%      
Credit risk | Energy          
Disclosure of major customers [line items]          
Percentage of sales 99.00% 96.00%      
Credit risk | Dairy          
Disclosure of major customers [line items]          
Percentage of sales 100.00% 85.00%      
Currency risk          
Disclosure of major customers [line items]          
Sensitivity analysis for types of market risk as a percentage 10.00% 10.00%      
Argentine Peso | Currency risk | Forward contract          
Disclosure of major customers [line items]          
Gain (loss) on hedge ineffectiveness recognised in profit or loss $ 3        
US Dollar | Currency risk | Forward contract          
Disclosure of major customers [line items]          
Notional amount 10,500 $ 10,700      
Gain (loss) on hedge ineffectiveness recognised in profit or loss 100 600      
Brazilian Reais | Currency risk | Forward contract          
Disclosure of major customers [line items]          
Notional amount 57,200        
Gain (loss) on hedge ineffectiveness recognised in profit or loss $ 2,000 $ 5,000