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Employee Benefits and Private Pension Plan - Additional information (Detail)
R$ in Thousands
12 Months Ended
Dec. 31, 2023
BRL (R$)
Employees
Dec. 31, 2022
BRL (R$)
Employees
Dec. 31, 2021
BRL (R$)
Disclosure of defined benefit plans [line items]      
Maximum matching contribution percentage 11.00%    
Defined contribution pension plan fund | R$ R$ 18,271 R$ 18,204  
Contribution to Ultraprev | R$ R$ 22,482 R$ 16,368 R$ 16,120
Number of active participating employees 4,053 4,097  
Number of retired participating employees 298 286  
Number of former employees receiving benefits 23 23  
Demographic assumption percentage of reasonably possible decrease in mortality table for other benefits 10.00%    
Bottom of range [member]      
Disclosure of defined benefit plans [line items]      
Monthly accumulated fund percentage 0.30%    
Fixed monthly accumulated fund period 5 years    
Top of range [member]      
Disclosure of defined benefit plans [line items]      
Monthly accumulated fund percentage 1.00%    
Fixed monthly accumulated fund period 35 years    
Average period 73 months