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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

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