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10. PROPERTY, PLANT AND EQUIPMENT (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]    
Cost, beginning R$ 29,083,214 R$ 27,726,117
Accumulated depreciation, beginning (11,118,375) (9,590,238)
Property, plant and equipment, beginning 17,964,839 18,135,879
Translation Adjustment 115,359 107,184
Acquisitions 1,327,894 1,063,746
Capitalized interest 71,611 91,957
Write-off and estimative losses, net of reversed (38,245) (28,057)
Depreciation   (1,380,193)
Write-off - sale of subsidiary LLC (191,226)  
Transfers to intangible assets 3,807 (26,183)
Others (1,603) 506
Property, plant and equipment, ending 18,046,864 17,964,839
Cost, ending 30,269,600 29,083,214
Accumulated depreciation, ending (12,222,736) (11,118,375)
Land    
Disclosure of detailed information about property, plant and equipment [line items]    
Cost, beginning 279,740 264,629
Property, plant and equipment, beginning 279,740 264,629
Translation Adjustment 7,730 8,702
Acquisitions 622 8,241
Write-off and estimative losses, net of reversed   653
Depreciation (134,534)  
Transfers to other asset categories 30,031 (2,485)
Write-off - sale of subsidiary LLC (238)  
Property, plant and equipment, ending 287,854 279,740
Cost, ending 287,854 279,740
Buildings and Infrastructure    
Disclosure of detailed information about property, plant and equipment [line items]    
Cost, beginning 3,819,929 3,637,903
Accumulated depreciation, beginning (1,022,982) (822,224)
Property, plant and equipment, beginning 2,796,947 2,815,679
Translation Adjustment 11,653 21,737
Acquisitions 1,259 1,196
Write-off and estimative losses, net of reversed (9,768) 30,634
Depreciation (1,043,188) (156,580)
Transfers to other asset categories 685,005 84,281
Write-off - sale of subsidiary LLC (16,950)  
Property, plant and equipment, ending 2,678,638 2,796,947
Cost, ending 3,751,429 3,819,929
Accumulated depreciation, ending (1,072,791) (1,022,982)
Machinery, equipment and facilities    
Disclosure of detailed information about property, plant and equipment [line items]    
Cost, beginning 21,674,362 20,712,371
Accumulated depreciation, beginning (9,688,442) (8,342,741)
Property, plant and equipment, beginning 11,985,920 12,369,630
Translation Adjustment 86,553 72,811
Acquisitions 144,499 91,251
Write-off and estimative losses, net of reversed (21,468) (30,383)
Depreciation (5,394) (1,174,852)
Transfers to other asset categories 891 659,119
Write-off - sale of subsidiary LLC (145,958)  
Transfers to intangible assets 5,559  
Others (9,651) (1,656)
Property, plant and equipment, ending 11,687,271 11,985,920
Cost, ending 22,426,782 21,674,362
Accumulated depreciation, ending (10,739,511) (9,688,442)
Furniture and fixtures    
Disclosure of detailed information about property, plant and equipment [line items]    
Cost, beginning 164,152 173,821
Accumulated depreciation, beginning (131,049) (140,658)
Property, plant and equipment, beginning 33,103 33,163
Translation Adjustment 543 593
Acquisitions 1,574 1,171
Write-off and estimative losses, net of reversed (6) (37)
Depreciation   (5,656)
Transfers to other asset categories (424,443) 3,869
Write-off - sale of subsidiary LLC (181)  
Property, plant and equipment, ending 30,530 33,103
Cost, ending 165,331 164,152
Accumulated depreciation, ending (134,801) (131,049)
Construction in progress    
Disclosure of detailed information about property, plant and equipment [line items]    
Cost, beginning 2,475,935 2,260,864
Accumulated depreciation, beginning  
Property, plant and equipment, beginning 2,475,935 2,260,864
Translation Adjustment 4,275 3,076
Acquisitions 1,158,788 951,796
Capitalized interest 71,611 91,957
Write-off and estimative losses, net of reversed (4,348) (2,536)
Depreciation (22,456)  
Transfers to other asset categories (291,484) (805,207)
Write-off - sale of subsidiary LLC (6,070)  
Transfers to intangible assets (1,752) (26,183)
Others 8,440 2,168
Property, plant and equipment, ending 3,282,436 2,475,935
Cost, ending 3,282,436 2,475,935
Other    
Disclosure of detailed information about property, plant and equipment [line items]    
Cost, beginning 669,096 676,529
Accumulated depreciation, beginning (275,902) (284,615)
Property, plant and equipment, beginning 393,194 391,914
Translation Adjustment 4,605 265
Acquisitions 21,152 10,091
Write-off and estimative losses, net of reversed (2,655) (26,388)
Depreciation (1,205,572) (43,105)
Transfers to other asset categories   60,423
Write-off - sale of subsidiary LLC (21,829)  
Others (392) (6)
Property, plant and equipment, ending 80,135 393,194
Cost, ending 355,768 669,096
Accumulated depreciation, ending R$ (275,633) R$ (275,902)