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8. INVESTMENTS (Details 3) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of fair value measurement of assets [line items]      
Equity in results of affiliated companies R$ 147,800 R$ 108,031  
Eliminations      
To cost of sales (40,823) (41,556)  
To taxes 13,880 14,129  
Others      
Amortization of fair value - investment in MRS (11,746) (11,746)  
Amortization of fair value - investment in CGPAR   (3,940)  
Equity in results 109,111 64,918 R$ 1,160,272
MRS Logistica S.A.      
Disclosure of fair value measurement of assets [line items]      
Equity in results of affiliated companies 171,905 155,617  
CBSI - Companhia Brasileira de Servicos de Infraestrutura      
Disclosure of fair value measurement of assets [line items]      
Equity in results of affiliated companies 1,785 2,953  
Transnordestina      
Disclosure of fair value measurement of assets [line items]      
Equity in results of affiliated companies (21,357) (52,127)  
Arvedi Metalfer do Brasil      
Disclosure of fair value measurement of assets [line items]      
Equity in results of affiliated companies (4,368) 1,372  
Others      
Disclosure of fair value measurement of assets [line items]      
Equity in results of affiliated companies R$ (165) R$ 216