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Employee Benefits and Private Pension Plan - Post-employment benefit expense (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of employee benefits [line items]      
Employee benefit expense R$ 10,682 R$ 27,558 R$ 23,418
Health and dental care plan [member]      
Summary of employee benefits [line items]      
Employee benefit expense 10,442 9,559 164
Indemnification of FGTS [member]      
Summary of employee benefits [line items]      
Employee benefit expense (5,818) 11,159 14,828
Seniority bonus [member]      
Summary of employee benefits [line items]      
Employee benefit expense 4,765 5,460 6,883
Life insurance [member]      
Summary of employee benefits [line items]      
Employee benefit expense R$ 1,293 R$ 1,380 R$ 1,543