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Employee Benefits and Private Pension Plan - Additional information (Detail)
R$ in Thousands
 1 Months Ended 12 Months Ended
May 31, 2020
BRL (R$)
Dec. 31, 2020
BRL (R$)
employee
Dec. 31, 2019
BRL (R$)
Dec. 31, 2018
BRL (R$)
Summary of employee benefits [line items]        
Maximum matching contribution percentage   11.00%    
Defined contribution pension plan reversion fund | R$ R$ 47,088 R$ 36,068    
Contribution to Ultraprev | R$ R$ 11,020 R$ 20,505 R$ 21,357 R$ 24,323
Number of active participating employees   7,290    
Number of retired participating employees   361    
Number of former employees receiving benefits   23    
Bottom of range [member]        
Summary of employee benefits [line items]        
Monthly accumulated fund percentage   0.30%    
Fixed monthly accumulated fund period   5 years    
Average period   10 months    
Top of range [member]        
Summary of employee benefits [line items]        
Monthly accumulated fund percentage   1.00%    
Fixed monthly accumulated fund period   35 years    
Average period   70 months