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Investments in joint controlled entities 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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of associates [line items]      
Investments in joint ventures and associates at beginning of period [1] R$ 78,593 R$ 162,620 R$ 178,854
Share of profit (loss) of joint ventures and associates 12,181 (17,634) (44,031)
Share of profit (loss) of associates - discontinued operations   48 414
Dividends (6,374) (998) (2,357)
Valuation adjustments 267 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 29,203
Capital decrease [2]   (6,501) (363)
Shareholder transactions - changes of interest 0 (966)  
Write-off of investment   (78,099)  
Reclassification to assets held for sale   (16,396)  
Other reserves     1,065
Proposed dividends     (165)
Investments in joint ventures and associates at end of period [1] 111,227 78,593 162,620
Joint ventures [member]      
Disclosure of associates [line items]      
Investments in joint ventures and associates at beginning of period [1] 71,389 137,004 153,076
Share of profit (loss) of joint ventures and associates 9,397 (18,068) (45,812)
Share of profit (loss) of associates - discontinued operations   0 0
Dividends (4,298) 0 0
Valuation adjustments 267 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 29,203
Capital decrease [2]   (5,001) (363)
Shareholder transactions - changes of interest 3,528 (966)  
Write-off of investment   (78,099)  
Reclassification to assets held for sale   0  
Other reserves     1,065
Proposed dividends     (165)
Investments in joint ventures and associates at end of period [1] 106,843 71,389 137,004
Associates [member]      
Disclosure of associates [line items]      
Investments in joint ventures and associates at beginning of period [1] 7,204 25,616 25,778
Share of profit (loss) of joint ventures and associates 2,784 434 1,781
Share of profit (loss) of associates - discontinued operations   48 414
Dividends (2,076) (998) (2,357)
Valuation adjustments 0 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 0
Capital decrease [2]   (1,500) 0
Shareholder transactions - changes of interest (3,528) 0  
Write-off of investment   0  
Reclassification to assets held for sale   (16,396)  
Other reserves     0
Proposed dividends     0
Investments in joint ventures and associates at end of period [1] R$ 4,384 R$ 7,204 R$ 25,616
[1] Investments in subsidiaries, joint ventures and associates net of provision for negative equity.
[2] Refers to reimbursement of expenses that preceded the port area auctions and that were apportioned among the other members of the consortium.