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18. RELATED-PARTY BALANCES AND TRANSACTIONS (Details 2) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of transactions between related parties [line items]    
Current assets R$ 162,987 R$ 488,603
Noncurrent assets 696,745 631,834
Total assets 859,732 1,120,437
Current liabilities 138,071 61,550
Noncurrent liabilities 41,937 28,004
Total liabilities 180,008 R$ 89,554
Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets 111,547  
Noncurrent assets 113,031  
Total assets 224,578  
Current liabilities 7,462  
Noncurrent liabilities 41,937  
Total liabilities 49,399  
CBS Previdencia | Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets  
Noncurrent assets 111,281  
Total assets 111,281  
Current liabilities  
Noncurrent liabilities 41,937  
Total liabilities 41,937  
Fundacao CSN | Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets 1,829  
Noncurrent assets  
Total assets 1,829  
Current liabilities 518  
Noncurrent liabilities  
Total liabilities 518  
Banco Fibra | Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets 53  
Noncurrent assets  
Total assets 53  
Current liabilities  
Noncurrent liabilities  
Total liabilities  
Usiminas | Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets  
Noncurrent assets  
Total assets  
Current liabilities 410  
Noncurrent liabilities  
Total liabilities 410  
Panatlantica | Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets 109,565  
Noncurrent assets 1,750  
Total assets 111,351  
Current liabilities 6,534  
Noncurrent liabilities  
Total liabilities 6,534  
Partifib Projetos Imobiliarios | Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets 100  
Noncurrent assets  
Total assets 100  
Current liabilities  
Noncurrent liabilities  
Total liabilities  
Vicunha Imoveis Ltda. | Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets  
Noncurrent assets  
Total assets  
Current liabilities  
Noncurrent liabilities  
Total liabilities  
Vicunha Servicos Ltda. | Other Related Parties    
Disclosure of transactions between related parties [line items]    
Current assets  
Noncurrent assets  
Total assets  
Current liabilities  
Noncurrent liabilities  
Total liabilities  
Arvedi Metalfer do Brasil S.A. | Associates    
Disclosure of transactions between related parties [line items]    
Current assets 9,650  
Noncurrent assets 29,020  
Total assets 38,670  
Current liabilities  
Noncurrent liabilities  
Total liabilities  
Joint Venture/Joint Operation    
Disclosure of transactions between related parties [line items]    
Current assets 41,790  
Noncurrent assets 554,694  
Total assets 596,484  
Current liabilities 130,609  
Noncurrent liabilities  
Total liabilities 130,609  
Joint Venture/Joint Operation | Ita Energetica S.A.    
Disclosure of transactions between related parties [line items]    
Current assets  
Noncurrent assets  
Total assets  
Current liabilities 2,741  
Noncurrent liabilities  
Total liabilities 2,741  
Joint Venture/Joint Operation | MRS Logistica S.A.    
Disclosure of transactions between related parties [line items]    
Current assets 40,828  
Noncurrent assets  
Total assets 40,828  
Current liabilities 100,749  
Noncurrent liabilities  
Total liabilities 100,749  
Joint Venture/Joint Operation | CBSI    
Disclosure of transactions between related parties [line items]    
Current assets 714  
Noncurrent assets  
Total assets 714  
Current liabilities 23,874  
Noncurrent liabilities  
Total liabilities 23,874  
Joint Venture/Joint Operation | Transnordestina Logistica S.A.    
Disclosure of transactions between related parties [line items]    
Current assets 248  
Noncurrent assets 554,694  
Total assets 554,942  
Current liabilities 3,245  
Noncurrent liabilities  
Total liabilities R$ 3,245