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16 PROVISION FOR TAX, SOCIAL SECURITY, LABOR, CIVIL AND ENVIRONMENTAL RISKS AND JUDICIAL DEPOSITS (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
ProvisionForTaxSocialSecurityLaborCivilAndEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities R$ 623,247 R$ 792,456
Judicial deposits 328,371 347,950
Accrued liabilities current 96,479 106,503
Accrued liabilities non current 526,768 685,953
Judicial deposits non current 328,371 347,950
Tax [Member]    
ProvisionForTaxSocialSecurityLaborCivilAndEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities 128,411 118,490
Judicial deposits 31,060 46,321
Social Security [Member]    
ProvisionForTaxSocialSecurityLaborCivilAndEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities 7,039 70,084
Judicial deposits   50,898
Labor [Member]    
ProvisionForTaxSocialSecurityLaborCivilAndEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities 305,309 362,228
Judicial deposits 227,213 214,625
Civil [Member]    
ProvisionForTaxSocialSecurityLaborCivilAndEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities 138,990 210,264
Judicial deposits 53,771 22,024
Environmental [Member]    
ProvisionForTaxSocialSecurityLaborCivilAndEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Accrued liabilities 43,498 31,390
Judicial deposits 3,731 1,900
Deposit Of A Guarantee [Member]    
ProvisionForTaxSocialSecurityLaborCivilAndEnvironmentalRisksAndJudicialDepositsLineItems [Line Items]    
Judicial deposits R$ 12,596 R$ 12,182