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Employee Benefits and Private Pension Plan - Sensitivity analysis (Detail)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
BRL (R$)
Discount rate [member]  
Summary of employee benefits [line items]  
Change in assumptions increase by 1.0 p.p
Decrease in liability R$ 26,741
Change in assumptions decrease by 1.0 p.p
Increase in liability R$ 49,344
Wage growth rate [member]  
Summary of employee benefits [line items]  
Change in assumptions decrease by 1.0 p.p
Decrease in liability R$ 34,978
Change in assumptions increase by 1.0 p.p
Increase in liability R$ 39,030
Medical services growth rate [member]  
Summary of employee benefits [line items]  
Change in assumptions decrease by 1.0 p.p
Decrease in liability R$ 7,137
Change in assumptions increase by 1.0 p.p
Increase in liability R$ 8,492