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10. INTANGIBLE ASSETS (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]    
Cost, beginning R$ 7,764,371 R$ 8,026,315
Accumulated amortization, beginning (396,637) (494,719)
Adjustment for accumulated recoverable value, beginning (109,330) (109,330)
Intangible assets, beginning 7,258,404 7,422,266
Effect of foreign exchange differences 60,105 (101,922)
Acquisitions and expenditures 622 3,119
Transfer of property, plant and equipment 26,183 16,538
Write-offs/disposals (70) (13,094)
Amortization (73,142) (68,318)
Aquisition control - CGPAR (56) 47
Transfer of Metalic - Held for sale (232)
Intangible assets, ending 7,272,046 7,258,404
Cost, ending 7,834,751 7,764,371
Accumulated amortization, ending (453,375) (396,637)
Adjustment for accumulated recoverable value, ending (109,330) (109,330)
Goodwill    
Disclosure of detailed information about intangible assets [line items]    
Cost, beginning 3,834,234 3,974,128
Accumulated amortization, beginning (133,973) (260,776)
Adjustment for accumulated recoverable value, beginning (109,330) (109,330)
Intangible assets, beginning 3,590,931 3,604,022
Effect of foreign exchange differences
Acquisitions and expenditures
Transfer of property, plant and equipment
Write-offs/disposals (13,091)
Amortization
Aquisition control - CGPAR
Transfer of Metalic - Held for sale
Intangible assets, ending 3,590,931 3,590,931
Cost, ending 3,834,234 3,834,234
Accumulated amortization, ending (133,973) (133,973)
Adjustment for accumulated recoverable value, ending (109,330) (109,330)
Customer relationships    
Disclosure of detailed information about intangible assets [line items]    
Cost, beginning 444,635 549,302
Accumulated amortization, beginning (146,975) (136,026)
Adjustment for accumulated recoverable value, beginning
Intangible assets, beginning 297,660 413,276
Effect of foreign exchange differences 41,916 (74,167)
Acquisitions and expenditures
Transfer of property, plant and equipment
Write-offs/disposals
Amortization (38,701) (41,449)
Aquisition control - CGPAR
Transfer of Metalic - Held for sale
Intangible assets, ending 300,875 297,660
Cost, ending 513,068 444,635
Accumulated amortization, ending (212,193) (146,975)
Adjustment for accumulated recoverable value, ending
Software    
Disclosure of detailed information about intangible assets [line items]    
Cost, beginning 183,166 173,154
Accumulated amortization, beginning (114,913) (97,917)
Adjustment for accumulated recoverable value, beginning
Intangible assets, beginning 68,253 75,237
Effect of foreign exchange differences 183 (236)
Acquisitions and expenditures 622 2,995
Transfer of property, plant and equipment 26,183 16,538
Write-offs/disposals (70) (3)
Amortization (21,986) (26,093)
Aquisition control - CGPAR 47
Transfer of Metalic - Held for sale (232)
Intangible assets, ending 73,185 68,253
Cost, ending 167,162 183,166
Accumulated amortization, ending (93,977) (114,913)
Adjustment for accumulated recoverable value, ending
Trademark and patents    
Disclosure of detailed information about intangible assets [line items]    
Cost, beginning 116,196 143,636
Accumulated amortization, beginning
Adjustment for accumulated recoverable value, beginning
Intangible assets, beginning 116,196 143,636
Effect of foreign exchange differences 17,941 (27,440)
Acquisitions and expenditures
Transfer of property, plant and equipment
Write-offs/disposals
Amortization
Aquisition control - CGPAR
Transfer of Metalic - Held for sale
Intangible assets, ending 134,137 116,196
Cost, ending 134,137 116,196
Accumulated amortization, ending
Adjustment for accumulated recoverable value, ending
Rights and licenses    
Disclosure of detailed information about intangible assets [line items]    
Cost, beginning [1] 3,185,700 3,185,700
Accumulated amortization, beginning [1] (776)
Adjustment for accumulated recoverable value, beginning [1]
Intangible assets, beginning [1] 3,184,924 3,185,700
Effect of foreign exchange differences [1]
Acquisitions and expenditures [1]
Transfer of property, plant and equipment [1]
Write-offs/disposals [1]
Amortization [1] (12,455) (776)
Aquisition control - CGPAR [1]
Transfer of Metalic - Held for sale [1]
Intangible assets, ending [1] 3,172,469 3,184,924
Cost, ending [1] 3,185,701 3,185,700
Accumulated amortization, ending [1] (13,232) (776)
Adjustment for accumulated recoverable value, ending [1]
Others    
Disclosure of detailed information about intangible assets [line items]    
Cost, beginning 440 395
Accumulated amortization, beginning
Adjustment for accumulated recoverable value, beginning
Intangible assets, beginning 440 395
Effect of foreign exchange differences 65 (79)
Acquisitions and expenditures 124
Transfer of property, plant and equipment
Write-offs/disposals
Amortization
Aquisition control - CGPAR (56)
Transfer of Metalic - Held for sale
Intangible assets, ending 449 440
Cost, ending 449 440
Accumulated amortization, ending
Adjustment for accumulated recoverable value, ending
[1] Composed mainly by mineral rights with estimated resources of 1,101 million tons. Corresponding amortization is recorded based on production volumes.