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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [line items]      
Employee benefit expense R$ 15,585 R$ 11,622 R$ 9,892
Health and dental care plan [member]      
Disclosure of defined benefit plans [line items]      
Employee benefit expense 15,265 11,127 10,442
Indemnification of FGTS [member]      
Disclosure of defined benefit plans [line items]      
Employee benefit expense 4,409 6,199 5,423
Seniority bonus [member]      
Disclosure of defined benefit plans [line items]      
Employee benefit expense 4,886 6,821 3,580
Life insurance [member]      
Disclosure of defined benefit plans [line items]      
Employee benefit expense R$ 797 R$ 1,117 R$ 1,293