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8. INVESTMENTS (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Oct. 15, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
InvestmentsLineItems [Line Items]          
Assets   R$ 50,869,276 R$ 47,327,524    
Shareholders' equity   11,361,932 10,013,440 R$ 8,288,229 R$ 7,384,521
Profit (Loss) for the year R$ 1,000,000 2,244,511 5,200,583 R$ 111,229  
Investments   R$ 3,584,169 5,630,613    
Usiminas [Member]          
InvestmentsLineItems [Line Items]          
Shareholders' equity     R$ 2,250,623    
Panatlantica S. A. ("Panatlantica") [Member]          
InvestmentsLineItems [Line Items]          
Direct equity interest, joint venture and joint operation   11.31% 11.33%    
Shareholders' equity   R$ 47,300 R$ 28,566    
Classified At Fair Value Through Profit Or Loss [Member]          
InvestmentsLineItems [Line Items]          
Shareholders' equity   47,300 2,279,189    
Other Investiments [Member]          
InvestmentsLineItems [Line Items]          
Shareholders' equity   157 112    
Profit (Loss) for the year   171 2,316    
Profit On Subsidiaries' Inventories [Member]          
InvestmentsLineItems [Line Items]          
Shareholders' equity   (18,563) (116,375)    
Profit (Loss) for the year   97,811 (43,903)    
Others [Member]          
InvestmentsLineItems [Line Items]          
Shareholders' equity   157 112    
Profit (Loss) for the year   171 2,316    
Investiments in Affiliated Companies [Member]          
InvestmentsLineItems [Line Items]          
Shareholders' equity   3,482,974 5,630,613    
Classification Of Investiments In The Balance Sheet [Member]          
InvestmentsLineItems [Line Items]          
Profit (Loss) for the year   R$ 125,715 135,706    
Arvedi Metalfer Do Brasil S.A. [Member]          
InvestmentsLineItems [Line Items]          
Associate name   Arvedi Metalfer do Brasil      
Assets   R$ 44,435 40,712    
Liabilities   31,712 26,308    
Shareholders' equity   12,723 14,404    
Profit (Loss) for the year   (1,682) (5,087)    
Associates [Member]          
InvestmentsLineItems [Line Items]          
Assets   44,435 40,712    
Liabilities   31,712 26,308    
Shareholders' equity   12,723 14,404    
Profit (Loss) for the year   R$ (1,682) (5,087)    
MRS Logistica S.A. [Member]          
InvestmentsLineItems [Line Items]          
Joint venture and joint operation name   MRS Logística S.A.      
Assets   R$ 4,145,205 3,125,912    
Liabilities   2,616,218 1,693,200    
Shareholders' equity   1,528,987 1,432,712    
Fair Value   433,635 445,383    
Profit (Loss) for the year   187,597 R$ 194,403    
CBSI - Companhia Brasileira De Servicos De Infraestrutura [Member]          
InvestmentsLineItems [Line Items]          
Joint venture and joint operation name     CBSI - Companhia Brasileira de Serviços de Infraestrutura    
Assets     R$ 25,941    
Liabilities     19,997    
Shareholders' equity     5,944    
Profit (Loss) for the year   6,695 4,501    
Joint-Venture And Joint-Operation [Member]          
InvestmentsLineItems [Line Items]          
Assets   8,543,639 7,217,457    
Liabilities   5,825,596 4,597,048    
Shareholders' equity   2,718,043 2,620,409    
Fair Value   704,751 716,499    
Profit (Loss) for the year   R$ 165,445 166,729    
Transnordestina Logistica S.A [Member]          
InvestmentsLineItems [Line Items]          
Joint venture and joint operation name   Transnordestina Logística S.A. [Member]      
Assets [1]   R$ 4,398,434 4,065,604    
Liabilities [1]   3,209,378 2,883,851    
Shareholders' equity [1]   1,189,056 1,181,753    
Fair Value [1]   271,116 271,116    
Profit (Loss) for the year [1]   (17,100) (20,429)    
MRS - Fair Value Amortization [Member]          
InvestmentsLineItems [Line Items]          
Profit (Loss) for the year   (11,747) (11,746)    
Eliminations [Member]          
InvestmentsLineItems [Line Items]          
Profit (Loss) for the year   (38,219) R$ (28,252)    
Investment Properties [Member]          
InvestmentsLineItems [Line Items]          
Shareholders' equity   R$ 101,195      
[1] As of December 31, 2019, and 2018, the Fair Value generated in the loss of control of Transnordestina Logistica S.A. is R$ 659,105 and impairment of R$ 387,989.