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Provisions and Contingencies - Breakdown of provisions by nature (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Summary Of Provisions [line items]    
Provisions by nature, beginning R$ 924,595  
Additions 21,962  
Reversals (15,125)  
Payments (45,367)  
Interest 11,980  
Provisions by nature, ending 898,045  
Current 43,660 R$ 40,455
Non-current 854,385 R$ 884,140
IRPJ and CSLL [member]    
Summary Of Provisions [line items]    
Provisions by nature, beginning 541,281  
Additions  
Reversals (537)  
Payments  
Interest 7,118  
Provisions by nature, ending 547,862  
PIS and COFINS [member]    
Summary Of Provisions [line items]    
Provisions by nature, beginning 10,155  
Additions  
Reversals (10,264)  
Payments  
Interest 109  
Provisions by nature, ending  
ICMS [member]    
Summary Of Provisions [line items]    
Provisions by nature, beginning 96,472  
Additions 15,580  
Reversals  
Payments (4,085)  
Interest 601  
Provisions by nature, ending 108,568  
Civil, environmental and regulatory claims [member]    
Summary Of Provisions [line items]    
Provisions by nature, beginning 85,855  
Additions  
Reversals (4,070)  
Payments (24,199)  
Interest 186  
Provisions by nature, ending 57,772  
Labor litigation [member]    
Summary Of Provisions [line items]    
Provisions by nature, beginning 98,010  
Additions 6,382  
Reversals  
Payments (17,083)  
Interest 3,366  
Provisions by nature, ending 90,675  
Other [member]    
Summary Of Provisions [line items]    
Provisions by nature, beginning 92,822  
Additions  
Reversals (254)  
Payments  
Interest 600  
Provisions by nature, ending R$ 93,168