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Provision for contingencies - Schedule Of Nature And Movement Of The Liabilities (Detail) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Detail Of Movement In Provision For Probable Losses [Line Items]    
Beginning balance R$ 1,242 R$ 486
Additions 12,113 1,043
Reversals (2,873) (265)
Payments (1,098) (22)
Interests 180  
Ending balance 9,564 1,242
Civil Provision [Member]    
Disclosure Detail Of Movement In Provision For Probable Losses [Line Items]    
Beginning balance 991 425
Additions 10,303 840
Reversals (1,848) (252)
Payments (712) (22)
Interests 142  
Ending balance 8,876 991
Labour Provision [Member]    
Disclosure Detail Of Movement In Provision For Probable Losses [Line Items]    
Beginning balance 251 61
Additions 1,810 203
Reversals (1,025) (13)
Payments (386)  
Interests 38  
Ending balance R$ 688 R$ 251