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Biological assets - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about biological assets [line items]    
Biological assets $ 105,536 $ 113,184
Percentage of reasonably possible increase in estimated costs 10.00% 10.00%
Percentage of reasonably possible decrease in estimated costs (10.00%) (10.00%)
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 $ 7,900 $ 8,600
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets 7,900 8,600
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 2,800 1,500
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets 2,800 1,500
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 2,000 3,400
Decrease in fair value measurement due to change in one or more unobservable inputs to reflect reasonably possible alternative assumptions, assets $ 2,000 $ 3,400