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Intangible assets - Additional Information (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about intangible assets [line items]      
Period of evaluation 5 years    
Property, plant, and equipment, transfer R$ (32,524) [1] R$ 3,405 [2] R$ 6,381 [3]
Intangible assets, transfer 10,176 [4] 1,086 [5] (1,070) [6]
Right-of-use assets [member]      
Disclosure of detailed information about intangible assets [line items]      
Property, plant, and equipment, transfer 22,348 4,491 5,311
Software [member]      
Disclosure of detailed information about intangible assets [line items]      
Software in progress 84,421 11,200 18,673
Intangible assets      
Disclosure of detailed information about intangible assets [line items]      
Property, plant, and equipment, transfer R$ 10,176 R$ 1,086 R$ 1,070
Bottom of range [member]      
Disclosure of detailed information about intangible assets [line items]      
Nominal discount rate 10.30%    
Real growth rate (0.50%)    
Top of range [member]      
Disclosure of detailed information about intangible assets [line items]      
Nominal discount rate 11.70%    
Real growth rate 0.50%    
[1] The remaining balance refers to R$ 22,348 transferred to right-of-use assets and R$ 10,176 transferred to intangible assets.
[2] Refers to R$ 1,086 transferred to intangible assets and R$ 4,491 transferred from right-of-use assets.
[3] Refers to R$ 1,070 transferred from intangible assets and R$ 5,311 transferred from right-of-use assets.
[4] Refers to R$ 10,176 transferred from property, plant and equipment.
[5] Refers to R$ 1,086 transferred to intangible assets and R$ 4,491 transferred from right-of-use assets.
[6] Refers to R$ 1,070 transferred to property, plant and equipment