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Investments in subsidiaries, joint ventures and associates - Summary of balances and changes in investments in joint ventures and associates (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of associates [line items]      
Investments in joint ventures and associates at beginning of period [1] R$ 111,227 R$ 78,593 R$ 162,620
Share of profit (loss) of subsidiaries, joint ventures and associates 11,908 [2] 12,181 (17,634)
Share of profit (loss) of associates - discontinued operations     48
Equity instrument granted (ii) 899 [3] 0  
Accumulated other comprehensive income   267  
Dividends (13,272) (6,374) (998)
Valuation adjustments     99
Actuarial gain (loss) of post-employment benefits of subsidiaries, net of income and social contribution taxes   (1,440) 5,723
Capital increase in cash   28,000 30,697
Capital decrease (3,100)   (6,501)
Other movements 342    
Shareholder transactions - changes of interest   0 (966)
Write-off of investment     (78,099)
Reclassification to assets held for sale     (16,396)
Investments in joint ventures and associates at end of period [1] 318,100 111,227 78,593
Terminal De Combustiveis Paulinia SA Opla Member      
Disclosure of associates [line items]      
Acquisition of Subsidiary 210,096    
Joint ventures [member]      
Disclosure of associates [line items]      
Investments in joint ventures and associates at beginning of period [1] 106,843 71,389 137,004
Share of profit (loss) of subsidiaries, joint ventures and associates 9,840 [2] 9,397 (18,068)
Share of profit (loss) of associates - discontinued operations     0
Equity instrument granted (ii) 899 [3] 0  
Accumulated other comprehensive income   267  
Dividends (11,072) (4,298) 0
Valuation adjustments     99
Actuarial gain (loss) of post-employment benefits of subsidiaries, net of income and social contribution taxes   (1,440) 5,723
Capital increase in cash   28,000 30,697
Capital decrease (3,100)   (5,001)
Other movements 342    
Shareholder transactions - changes of interest   3,528 (966)
Write-off of investment     (78,099)
Reclassification to assets held for sale     0
Investments in joint ventures and associates at end of period [1] 313,848 106,843 71,389
Joint ventures [member] | Terminal De Combustiveis Paulinia SA Opla Member      
Disclosure of associates [line items]      
Acquisition of Subsidiary 210,096    
Associates [member]      
Disclosure of associates [line items]      
Investments in joint ventures and associates at beginning of period [1] 4,384 7,204 25,616
Share of profit (loss) of subsidiaries, joint ventures and associates 2,068 [2] 2,784 434
Share of profit (loss) of associates - discontinued operations     48
Equity instrument granted (ii) 0 0  
Accumulated other comprehensive income   0  
Dividends (2,200) (2,076) (998)
Valuation adjustments     0
Actuarial gain (loss) of post-employment benefits of subsidiaries, net of income and social contribution taxes   0 0
Capital increase in cash   0 0
Capital decrease 0   (1,500)
Other movements 0    
Shareholder transactions - changes of interest   (3,528) 0
Write-off of investment     0
Reclassification to assets held for sale     (16,396)
Investments in joint ventures and associates at end of period [1] 4,252 R$ 4,384 R$ 7,204
Associates [member] | Terminal De Combustiveis Paulinia SA Opla Member      
Disclosure of associates [line items]      
Acquisition of Subsidiary R$ 0    
[1] Investments in subsidiaries, joint ventures and associates net of provision for equity deficit.
[2] Adjusted for unrealized profits between subsidiaries.
[3] Amounts refer to grants of long-term incentives in subsidiaries Ipiranga Produtos de Petróleo S.A., Ultragaz Participações Ltda. and Ultracargo–Operações Logísticas Ltda.