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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of defined benefit plans [line items]      
Employee benefit expense R$ 27,077 R$ 17,521 R$ 20,944
Health and dental care plan [member]      
Disclosure of defined benefit plans [line items]      
Employee benefit expense 20,420 11,182 14,660
Indemnification of FGTS [member]      
Disclosure of defined benefit plans [line items]      
Employee benefit expense 5,290 4,909 4,766
Seniority bonus [member]      
Disclosure of defined benefit plans [line items]      
Employee benefit expense 254 286 563
Life insurance [member]      
Disclosure of defined benefit plans [line items]      
Employee benefit expense R$ 1,113 R$ 1,144 R$ 955