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Biological assets - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about biological assets [line items]    
Percentage of reasonably possible increase in estimated costs 10.00% 10.00%
Percentage of reasonably possible decrease in estimated costs (10.00%) (10.00%)
Biological assets $ 113,184 $ 141,645
Sown land – sugarcane    
Disclosure of detailed information about biological assets [line items]    
Increase in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets 10,800,000 9,100,000
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets 8,600,000 10,800,000
Sown land – crops    
Disclosure of detailed information about biological assets [line items]    
Increase in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets 1,000,000 1,100,000
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets 1,500,000 1,000,000
Sown land – rice    
Disclosure of detailed information about biological assets [line items]    
Increase in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets 2,700,000 2,800,000
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets $ 3,400,000 $ 2,700,000