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Provisions and contingent liabilities - Breakdown of provisions by nature (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of other provisions [line items]        
Beginning balance R$ 1,304,130 R$ 1,040,172 R$ 932,185  
Additions 154,189 293,550 239,013  
Reversals (1) (144,229) [1] (100,575) (87,807)  
Payments/ write-offs (683,462) (70,128) (84,939)  
Interest 27,732 139,864 41,720  
Acquisition of subsidiary   1,247    
Ending Balance 658,360 1,304,130 1,040,172  
Current 47,788 45,828 22,837 R$ 119,942
Non-current 610,572 1,258,302 1,017,335 R$ 812,243
IRPJ and CSLL [member]        
Disclosure of other provisions [line items]        
Beginning balance 636,167 559,217 552,172  
Additions 949 14,597 7,154  
Reversals (1) (15,124) [1] (6,717) (36,683)  
Payments/ write-offs (610,534) 0 0  
Interest 21,488 69,070 36,574  
Acquisition of subsidiary   0 0  
Ending Balance 32,946 636,167 559,217  
ICMS - State VAT [member]        
Disclosure of other provisions [line items]        
Beginning balance 107,172 68,434 84,155  
Additions 41,474 46,743 35,238  
Reversals (1) (72,427) [1] (21,148) (14,907)  
Payments/ write-offs (10,002) (14,747) (38,097)  
Interest 867 27,101 2,045  
Acquisition of subsidiary   789 0  
Ending Balance 67,082 107,172 68,434  
Civil, environmental and regulatory claims [member]        
Disclosure of other provisions [line items]        
Beginning balance 150,258 93,416 108,761  
Additions 66,215 124,857 18,326  
Reversals (1) (19,002) [1] (29,402) (9,980)  
Payments/ write-offs (35,519) (39,071) (23,700)  
Interest 20 0 9  
Acquisition of subsidiary   458 0  
Ending Balance 161,972 150,258 93,416  
Provision for indemnities [member]        
Disclosure of other provisions [line items]        
Beginning balance 203,780 150,820 0  
Additions 19,519 32,691 150,820  
Reversals (1) (6,081) [1] (7,969) 0  
Payments/ write-offs (12,959) 0 0  
Interest 2,549 28,238 0  
Acquisition of subsidiary   0 0  
Ending Balance 206,808 203,780 150,820  
Labor [member]        
Disclosure of other provisions [line items]        
Beginning balance 59,144 73,172 95,460  
Additions 18,468 27,333 22,663  
Reversals (1) (16,447) [1] (27,308) (22,387)  
Payments/ write-offs (7,764) (16,310) (23,142)  
Interest 768 2,257 578  
Acquisition of subsidiary   0 0  
Ending Balance 54,169 59,144 73,172  
Others [Member]        
Disclosure of other provisions [line items]        
Beginning balance 147,609 95,113 91,637  
Additions 7,564 47,329 4,812  
Reversals (1) (15,148) [1] (8,031) (3,850)  
Payments/ write-offs (6,684) 0 0  
Interest 2,040 13,198 2,514  
Acquisition of subsidiary   0 0  
Ending Balance R$ 135,383 R$ 147,609 R$ 95,113  
[1] Of this amount, MR$ 28,612 corresponds to the reversals of updates.