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17. PROVISION FOR TAX, SOCIAL SECURITY, LABOR, CIVIL AND ENVIRONMENTAL RISKS AND JUDICIAL DEPOSITS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value measurement of liabilities [line items]    
Accrued liabilities R$ 792,456 R$ 825,091
Judicial deposits 347,950 339,351
Provisions for tax, social security, labor and civil risks 106,503 105,958
Provision for environmental liabilities and decommissioning of assets 281,766 337,013
Deposit from banks   339,351
Tax    
Disclosure of fair value measurement of liabilities [line items]    
Accrued liabilities 118,490 113,451
Judicial deposits 46,321 52,542
Social security    
Disclosure of fair value measurement of liabilities [line items]    
Accrued liabilities 70,084 74,522
Judicial deposits 50,898 50,098
Labor    
Disclosure of fair value measurement of liabilities [line items]    
Accrued liabilities 362,228 451,173
Judicial deposits 214,625 202,104
Civil    
Disclosure of fair value measurement of liabilities [line items]    
Accrued liabilities 210,264 148,212
Judicial deposits 22,024 22,752
Environmental    
Disclosure of fair value measurement of liabilities [line items]    
Accrued liabilities 31,390 37,733
Judicial deposits 1,900 1,826
Deposit of a guarantee    
Disclosure of fair value measurement of liabilities [line items]    
Judicial deposits R$ 12,182 R$ 10,029