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14. INCOME TAX AND SOCIAL CONTRIBUTION (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning R$ (976,746) R$ (993,967)      
Movement in shareholders' equity 26,778 71,769      
Movement in profit or loss (50,128) (60,368)      
Other movement (110,344) 5,820      
Deferred tax asset/liability, ending (1,110,440) (976,746)      
Total deferred assets     R$ 63,119 R$ 70,151 R$ 78,066
Total deferred liabilities     (1,173,559) (1,046,897) (1,072,033)
Total deferred (1,110,440) (976,746) (1,110,440) (976,746) (993,967)
Deferred income tax losses          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 970,800 417,256      
Movement in profit or loss 245,846 556,397      
Other movement (79,412) (2,853)      
Deferred tax asset/liability, ending 1,137,234 970,800      
Total deferred 970,800 970,800 1,137,234 970,800 417,256
Deferred social contribution tax losses          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 340,629 161,769      
Movement in profit or loss 94,843 179,887      
Other movement (28,588) (1,027)      
Deferred tax asset/liability, ending 406,884 340,629      
Total deferred 340,629 340,629 406,884 340,629 161,769
Temporary differences          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (2,288,175) (1,572,992)      
Movement in shareholders' equity 26,778 71,769      
Movement in profit or loss (390,817) (796,652)      
Other movement (2,344) 9,700      
Deferred tax asset/liability, ending (2,654,558) (2,288,175)      
Total deferred (2,288,175) (2,288,175) (2,654,558) (2,288,175) (1,572,992)
Provision for tax social security, labor, civil and environmental risks          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 256,936 245,923      
Movement in profit or loss 12,963 7,615      
Other movement   3,398      
Deferred tax asset/liability, ending 269,899 256,936      
Total deferred 256,936 256,936 269,899 256,936 245,923
Provision for environmental liabilities          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 95,048 89,290      
Movement in profit or loss (8,197) 5,758      
Deferred tax asset/liability, ending 86,851 95,048      
Total deferred 95,048 95,048 86,851 95,048 89,290
Assets impairment losses          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 93,908 87,152      
Movement in profit or loss (5,475) 6,756      
Deferred tax asset/liability, ending 88,433 93,908      
Total deferred 93,908 93,908 88,433 93,908 87,152
Inventory impairment losses          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 35,703 29,048      
Movement in profit or loss 10,111 5,234      
Other movement   1,421      
Deferred tax asset/liability, ending 45,814 35,703      
Total deferred 35,703 35,703 45,814 35,703 29,048
(Gains )/ losses in financial instruments          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (2,300) (5,454)      
Movement in profit or loss 1,388 3,154      
Deferred tax asset/liability, ending (912) (2,300)      
Total deferred (2,300) (2,300) (912) (2,300) (5,454)
(Gains )/losses on available for sale financial assets          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 705,929 947,989      
Movement in shareholders' equity 316,563 (242,060)      
Deferred tax asset/liability, ending 1,022,492 705,929      
Total deferred 705,929 705,929 1,022,492 705,929 947,989
Actuarial liability (pension and healthcare plan)          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 134,578 164,167      
Movement in shareholders' equity 180,834 (15,387)      
Movement in profit or loss (41,065) (14,202)      
Other movement (1,289)        
Deferred tax asset/liability, ending 273,058 134,578      
Total deferred 134,578 134,578 273,058 134,578 164,167
Accrued supplies and services          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 123,101 92,401      
Movement in profit or loss (55,385) 30,625      
Other movement   75      
Deferred tax asset/liability, ending 67,716 123,101      
Total deferred 123,101 123,101 67,716 123,101 92,401
Allowance for doubtful debts          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 42,008 38,614      
Movement in profit or loss 5,208 1,751      
Other movement   1,643      
Deferred tax asset/liability, ending 47,216 42,008      
Total deferred 42,008 42,008 47,216 42,008 38,614
Goodwil on merger          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 815 9,211      
Movement in profit or loss (207) (283)      
Other movement   (8,113)      
Deferred tax asset/liability, ending 608 815      
Total deferred 815 815 608 815 9,211
Unrealized exchange differences          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 1,589,651 2,427,926      
Movement in shareholders' equity 56,493        
Movement in profit or loss (134,992) (838,275)      
Deferred tax asset/liability, ending 1,511,152 1,589,651      
Total deferred 1,589,651 1,589,651 1,511,152 1,589,651 2,427,926
(Gain) in control loss on Transnordestina          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (92,180) (224,096)      
Movement in profit or loss   131,916      
Deferred tax asset/liability, ending (92,180) (92,180)      
Total deferred (92,180) (92,180) (92,180) (92,180) (224,096)
Cash flow hedge accounting          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 148,471 516,831      
Movement in shareholders' equity (13,992) (368,360)      
Deferred tax asset/liability, ending 134,479 148,471      
Total deferred 148,471 148,471 134,479 148,471 516,831
Acquisition Fair Value SWT/CBL          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (199,001) (299,574)      
Movement in shareholders' equity (21,143) 52,506      
Movement in profit or loss 26,833 42,717      
Other movement   5,350      
Deferred tax asset/liability, ending (193,311) (199,001)      
Total deferred (199,001) (199,001) (193,311) (199,001) (299,574)
Deferred taxes non computed          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (1,324,437) (1,673,904)      
Movement in shareholders' equity (566,173) 527,520      
Movement in profit or loss (3,255) (175,915)      
Other movement (115) (2,138)      
Deferred tax asset/liability, ending (1,893,980) (1,324,437)      
Total deferred (1,324,437) (1,324,437) (1,893,980) (1,324,437) (1,673,904)
Estimated (Losses)/reversals to deferred taxes credits          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (3,013,730) (3,173,048)      
Movement in shareholders' equity 82,769 114,627      
Movement in profit or loss (123,056) 44,691      
Deferred tax asset/liability, ending (3,054,017) (3,013,730)      
Total deferred (3,013,730) (3,013,730) (3,054,017) (3,013,730) (3,173,048)
Business Combination          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning (1,072,824) (1,058,088)      
Movement in profit or loss 32,288 (14,736)      
Deferred tax asset/liability, ending (1,040,536) (1,072,824)      
Total deferred (1,072,824) (1,072,824) (1,040,536) (1,072,824) (1,058,088)
Others          
Disclosure of fair value measurement of liabilities [line items]          
Deferred tax asset/liability, beginning 190,149 212,620      
Movement in shareholders' equity (8,573) 2,923      
Movement in profit or loss (107,976) (33,458)      
Other movement (940) 8,064      
Deferred tax asset/liability, ending 72,660 190,149      
Total deferred R$ 190,149 R$ 190,149 R$ 72,660 R$ 190,149 R$ 212,620