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19. RELATED-PARTY BALANCES AND TRANSACTIONS (Details 3) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of transactions between related parties [line items]    
Current assets R$ 238,144 R$ 162,987
Noncurrent assets 1,025,339 696,745
Total assets 1,263,483 859,732
Current liabilities 171,300 138,071
Noncurrent liabilities 104,611 41,937
Total liabilities 275,911 R$ 180,008
Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets 147,453  
Noncurrent assets 99,894  
Total assets 247,347  
Current liabilities 16,472  
Noncurrent liabilities 7,982  
Total liabilities 24,454  
CBS Previdencia | Other Related Parties    
Disclosure of transactions between related parties [line items]    
Noncurrent assets 99,894  
Total assets 99,894  
Noncurrent liabilities 7,982  
Total liabilities 7,982  
Banco Fibra | Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets 92,334  
Total assets 92,334  
Panatlantica | Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets 53,027  
Total assets 53,027  
Current liabilities 15,643  
Total liabilities 15,643  
Other | Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets 2,092  
Total assets 2,092  
Current liabilities 829  
Total liabilities 829  
Arvedi Metalfer do Brasil S.A. | Associates    
Disclosure of transactions between related parties [line items]    
Current assets 42,834  
Total assets 42,834  
Joint Venture/Joint Operation    
Disclosure of transactions between related parties [line items]    
Current assets 47,857  
Noncurrent assets 925,445  
Total assets 973,302  
Current liabilities 154,828  
Noncurrent liabilities 96,629  
Total liabilities 251,457  
Joint Venture/Joint Operation | Ita Energetica S.A.    
Disclosure of transactions between related parties [line items]    
Current liabilities 2,550  
Total liabilities 2,550  
Joint Venture/Joint Operation | MRS Logistica S.A.    
Disclosure of transactions between related parties [line items]    
Current assets 46,243  
Total assets 46,243  
Current liabilities 101,264  
Noncurrent liabilities 96,629  
Total liabilities 197,893  
Joint Venture/Joint Operation | CBSI    
Disclosure of transactions between related parties [line items]    
Current assets 3  
Total assets 3  
Current liabilities 37,362  
Total liabilities 37,362  
Joint Venture/Joint Operation | Transnordestina Logistica S.A.    
Disclosure of transactions between related parties [line items]    
Current assets 1,611  
Noncurrent assets 925,445  
Total assets 927,056  
Current liabilities 13,652  
Total liabilities R$ 13,652