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Biological assets - Cost of production (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed $ 225,917 $ 254,440
Costs incurred during the year, own produce consumed 5,809 5,898
Costs incurred during the year 231,726 260,338
Salaries, social security expenses and employee benefits    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 21,423 28,683
Depreciation and amortization    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 3,583 6,402
Fertilizers, agrochemicals and seeds    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 80,166 77,515
Fuel, lubricants and others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 5,004 5,766
Maintenance and repairs    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 6,925 8,183
Freights    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 678 939
Contractors and services    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 39,461 48,706
Feeding expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 9,941 9,759
Veterinary expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,663 1,931
Energy power    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 3,305 2,775
Professional fees    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 569 676
Other taxes    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,540 2,004
Lease expense and similar arrangements    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 46,711 53,952
Others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 4,948 7,149
Farming | Crops    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 78,984 92,034
Costs incurred during the year, own produce consumed 0 0
Costs incurred during the year 78,984 92,034
Farming | Crops | Salaries, social security expenses and employee benefits    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 2,710 3,999
Farming | Crops | Depreciation and amortization    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 147 413
Farming | Crops | Fertilizers, agrochemicals and seeds    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 34,961 35,715
Farming | Crops | Fuel, lubricants and others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 811 1,075
Farming | Crops | Maintenance and repairs    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 943 1,303
Farming | Crops | Freights    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 119 234
Farming | Crops | Contractors and services    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 23,231 29,738
Farming | Crops | Feeding expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Farming | Crops | Veterinary expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Farming | Crops | Energy power    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 109 123
Farming | Crops | Professional fees    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 165 180
Farming | Crops | Other taxes    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,293 1,621
Farming | Crops | Lease expense and similar arrangements    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 11,868 13,057
Farming | Crops | Others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 2,627 4,576
Farming | Rice    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 33,121 39,547
Costs incurred during the year, own produce consumed 0 0
Costs incurred during the year 33,121 39,547
Farming | Rice | Salaries, social security expenses and employee benefits    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 5,336 7,312
Farming | Rice | Depreciation and amortization    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Farming | Rice | Fertilizers, agrochemicals and seeds    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 10,189 10,647
Farming | Rice | Fuel, lubricants and others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 660 666
Farming | Rice | Maintenance and repairs    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 2,349 2,419
Farming | Rice | Freights    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 387 500
Farming | Rice | Contractors and services    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 10,571 14,706
Farming | Rice | Feeding expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Farming | Rice | Veterinary expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Farming | Rice | Energy power    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 2,432 1,954
Farming | Rice | Professional fees    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 83 173
Farming | Rice | Other taxes    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 114 156
Farming | Rice | Lease expense and similar arrangements    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 174 138
Farming | Rice | Others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 826 876
Farming | Dairy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 18,267 20,213
Costs incurred during the year, own produce consumed 5,464 5,789
Costs incurred during the year 23,731 26,002
Farming | Dairy | Salaries, social security expenses and employee benefits    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 3,429 4,762
Farming | Dairy | Depreciation and amortization    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Farming | Dairy | Fertilizers, agrochemicals and seeds    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 9
Farming | Dairy | Fuel, lubricants and others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 683 741
Farming | Dairy | Maintenance and repairs    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,557 1,912
Farming | Dairy | Freights    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 80 128
Farming | Dairy | Contractors and services    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Farming | Dairy | Feeding expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 9,795 9,585
Farming | Dairy | Veterinary expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,522 1,783
Farming | Dairy | Energy power    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 764 698
Farming | Dairy | Professional fees    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 140 220
Farming | Dairy | Other taxes    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 8 7
Farming | Dairy | Lease expense and similar arrangements    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Farming | Dairy | Others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 289 368
Farming | All other segments    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,424 1,369
Costs incurred during the year, own produce consumed 345 109
Costs incurred during the year 1,769 1,478
Farming | All other segments | Salaries, social security expenses and employee benefits    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 540 386
Farming | All other segments | Depreciation and amortization    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Farming | All other segments | Fertilizers, agrochemicals and seeds    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Farming | All other segments | Fuel, lubricants and others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 60 64
Farming | All other segments | Maintenance and repairs    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 287 220
Farming | All other segments | Freights    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 92 77
Farming | All other segments | Contractors and services    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 38 30
Farming | All other segments | Feeding expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 146 174
Farming | All other segments | Veterinary expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 141 148
Farming | All other segments | Energy power    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Farming | All other segments | Professional fees    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 4 19
Farming | All other segments | Other taxes    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 83 129
Farming | All other segments | Lease expense and similar arrangements    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 3 0
Farming | All other segments | Others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 30 122
Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 94,121 101,277
Costs incurred during the year, own produce consumed 0 0
Costs incurred during the year 94,121 101,277
Sugar, Ethanol and Energy | Salaries, social security expenses and employee benefits    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 9,408 12,224
Sugar, Ethanol and Energy | Depreciation and amortization    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 3,436 5,989
Sugar, Ethanol and Energy | Fertilizers, agrochemicals and seeds    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 35,016 31,144
Sugar, Ethanol and Energy | Fuel, lubricants and others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 2,790 3,220
Sugar, Ethanol and Energy | Maintenance and repairs    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,789 2,329
Sugar, Ethanol and Energy | Freights    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Sugar, Ethanol and Energy | Contractors and services    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 5,621 4,232
Sugar, Ethanol and Energy | Feeding expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Sugar, Ethanol and Energy | Veterinary expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Sugar, Ethanol and Energy | Energy power    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Sugar, Ethanol and Energy | Professional fees    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 177 84
Sugar, Ethanol and Energy | Other taxes    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 42 91
Sugar, Ethanol and Energy | Lease expense and similar arrangements    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 34,666 40,757
Sugar, Ethanol and Energy | Others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed $ 1,176 $ 1,207