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Employee Benefits and Private Pension Plan - Additional information (Detail)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Employee
Dec. 31, 2018
BRL (R$)
Dec. 31, 2017
BRL (R$)
Summary of employee benefits [line items]      
Maximum matching contribution percentage 11.00%    
Contribution to Ultraprev | R$ R$ 21,357 R$ 24,323 R$ 24,819
Number of active participating employees 8,008    
Number of retired participating employees 328    
Number of former employees receiving benefits 26    
Bottom of range [member]      
Summary of employee benefits [line items]      
Monthly accumulated fund percentage 0.30%    
Fixed monthly accumulated fund period 5 years    
Top of range [member]      
Summary of employee benefits [line items]      
Monthly accumulated fund percentage 1.00%    
Fixed monthly accumulated fund period 35 years