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Employee Benefits and Private Pension Plan - Sensitivity analysis (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Discount rate [member]    
Summary of employee benefits [line items]    
Change in assumptions increase by 1.0 p.p increase by 1.0 p.p
Decrease in liability R$ 17,500 R$ 10,237
Change in assumptions decrease by 1.0 p.p decrease by 1.0 p.p
Increase in liability R$ 20,547 R$ 11,690
Wage growth rate [member]    
Summary of employee benefits [line items]    
Change in assumptions decrease by 1.0 p.p decrease by 1.0 p.p
Decrease in liability R$ 2,127 R$ 2,807
Change in assumptions increase by 1.0 p.p increase by 1.0 p.p
Increase in liability R$ 2,344 R$ 3,103
Medical services growth rate [member]    
Summary of employee benefits [line items]    
Change in assumptions decrease by 1.0 p.p decrease by 1.0 p.p
Decrease in liability R$ 12,002 R$ 3,837
Change in assumptions increase by 1.0 p.p increase by 1.0 p.p
Increase in liability R$ 14,201 R$ 4,413