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9. INVESTMENTS (Details 2) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]      
Equity in results of affiliated companies R$ 173,145 R$ 147,800  
Eliminations      
To cost of sales (42,806) (40,823)  
To taxes 14,554 13,880  
Others      
Amortization of fair value - investment in MRS (11,746) (11,746)  
Others 2,559    
Equity in results adjusted 135,706 109,111 R$ 64,918
MRS Logistica S.A.      
Disclosure of fair value measurement of assets [line items]      
Equity in results of affiliated companies 194,403 171,905  
CBSI - Companhia Brasileira de Servicos de Infraestrutura      
Disclosure of fair value measurement of assets [line items]      
Equity in results of affiliated companies 4,501 1,785  
Transnordestina      
Disclosure of fair value measurement of assets [line items]      
Equity in results of affiliated companies (20,429) (21,357)  
Arvedi Metalfer do Brasil      
Disclosure of fair value measurement of assets [line items]      
Equity in results of affiliated companies (5,087) (4,368)  
Others      
Disclosure of fair value measurement of assets [line items]      
Equity in results of affiliated companies R$ (243) R$ (165)