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Biological assets - Cost of production (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed $ 254,440 $ 212,771
Costs incurred during the year, own produce consumed 5,898 5,353
Costs incurred during the year 260,338 218,124
Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 101,277 91,235
Costs incurred during the year, own produce consumed 0 0
Costs incurred during the year 101,277 91,235
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 28,683 26,279
Salaries, social security expenses and employee benefits | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 12,224 12,610
Depreciation and amortization    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 6,402 6,275
Depreciation and amortization | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 5,989 5,880
Fertilizers, agrochemicals and seeds    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 77,515 56,988
Fertilizers, agrochemicals and seeds | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 31,144 24,087
Fuel, lubricants and others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 5,766 6,672
Fuel, lubricants and others | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 3,220 3,385
Maintenance and repairs    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 8,183 8,462
Maintenance and repairs | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 2,329 2,519
Freights    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 939 2,046
Freights | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Contractors and services    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 48,706 39,668
Contractors and services | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 4,232 2,651
Feeding expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 9,759 9,074
Feeding expenses | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Veterinary expenses    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,931 1,693
Veterinary expenses | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Energy power    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 2,775 1,464
Energy power | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Professional fees    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 676 530
Professional fees | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 84 145
Other taxes    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 2,004 1,916
Other taxes | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 91 116
Lease expense and similar arrangements    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 53,952 45,625
Lease expense and similar arrangements | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 40,757 38,555
Others    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 7,149 6,079
Others | Sugar, Ethanol and Energy    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,207 1,287
Dairy | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 20,213 18,532
Costs incurred during the year, own produce consumed 5,789 5,353
Costs incurred during the year 26,002 23,885
Dairy | Salaries, social security expenses and employee benefits | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 4,762 3,849
Dairy | Depreciation and amortization | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Dairy | Fertilizers, agrochemicals and seeds | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 9 80
Dairy | Fuel, lubricants and others | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 741 772
Dairy | Maintenance and repairs | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,912 1,787
Dairy | Freights | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 128 127
Dairy | Contractors and services | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Dairy | Feeding expenses | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 9,585 9,053
Dairy | Veterinary expenses | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,783 1,624
Dairy | Energy power | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 698 492
Dairy | Professional fees | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 220 169
Dairy | Other taxes | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 7 8
Dairy | Lease expense and similar arrangements | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 8
Dairy | Others | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 368 563
Crops | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 92,034 68,607
Costs incurred during the year, own produce consumed 0 0
Costs incurred during the year 92,034 68,607
Crops | Salaries, social security expenses and employee benefits | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 3,999 3,786
Crops | Depreciation and amortization | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 413 395
Crops | Fertilizers, agrochemicals and seeds | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 35,715 24,774
Crops | Fuel, lubricants and others | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,075 971
Crops | Maintenance and repairs | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,303 1,253
Crops | Freights | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 234 1,421
Crops | Contractors and services | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 29,738 23,769
Crops | Feeding expenses | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Crops | Veterinary expenses | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Crops | Energy power | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 123 119
Crops | Professional fees | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 180 131
Crops | Other taxes | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,621 1,561
Crops | Lease expense and similar arrangements | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 13,057 6,965
Crops | Others | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 4,576 3,462
Rice | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 39,547 33,839
Costs incurred during the year, own produce consumed 0 0
Costs incurred during the year 39,547 33,839
Rice | Salaries, social security expenses and employee benefits | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 7,312 5,820
Rice | Depreciation and amortization | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Rice | Fertilizers, agrochemicals and seeds | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 10,647 8,047
Rice | Fuel, lubricants and others | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 666 1,527
Rice | Maintenance and repairs | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 2,419 2,811
Rice | Freights | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 500 479
Rice | Contractors and services | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 14,706 13,248
Rice | Feeding expenses | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Rice | Veterinary expenses | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
Rice | Energy power | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,954 853
Rice | Professional fees | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 173 85
Rice | Other taxes | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 156 131
Rice | Lease expense and similar arrangements | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 138 97
Rice | Others | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 876 741
All other segments | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 1,369 558
Costs incurred during the year, own produce consumed 109 0
Costs incurred during the year 1,478 558
All other segments | Salaries, social security expenses and employee benefits | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 386 214
All other segments | Depreciation and amortization | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
All other segments | Fertilizers, agrochemicals and seeds | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
All other segments | Fuel, lubricants and others | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 64 17
All other segments | Maintenance and repairs | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 220 92
All other segments | Freights | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 77 19
All other segments | Contractors and services | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 30 0
All other segments | Feeding expenses | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 174 21
All other segments | Veterinary expenses | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 148 69
All other segments | Energy power | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
All other segments | Professional fees | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 19 0
All other segments | Other taxes | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 129 100
All other segments | Lease expense and similar arrangements | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed 0 0
All other segments | Others | Farming    
Disclosure of reconciliation of changes in biological assets [line items]    
Costs incurred during the year, excluding own produce consumed $ 122 $ 26