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8. INVESTMENTS (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
InvestmentsLineItems [Line Items]      
Equity in results of affiliated companies R$ 175,524 R$ 173,145  
Eliminations      
To cost of sales (57,908) (42,806)  
To taxes 19,689 14,554  
Others      
Amortization of fair value - investment in MRS (11,747) (11,746)  
Others 157 2,559  
Equity in results adjusted 125,715 135,706 R$ 109,111
MRS Logistica S.A. [Member]      
InvestmentsLineItems [Line Items]      
Equity in results of affiliated companies 187,597 194,403  
CBSI - Companhia Brasileira De Servicos De Infraestrutura [Member]      
InvestmentsLineItems [Line Items]      
Equity in results of affiliated companies [1] 6,695 4,501  
Transnordestina Logistica S.A. [Member]      
InvestmentsLineItems [Line Items]      
Equity in results of affiliated companies (17,100) (20,429)  
Arvedi Metalfer Do Brasil S.A. [Member]      
InvestmentsLineItems [Line Items]      
Equity in results of affiliated companies (1,682) (5,087)  
Others [Member]      
InvestmentsLineItems [Line Items]      
Equity in results of affiliated companies R$ 14 R$ (243)  
[1] Refers to the equity in results of affiliated companies until November 30, 2019.