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Taxes to Recover - Additional Information (Detail) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Recoverable Income Tax and Social Contribution Taxes [line items]    
Recoverable taxes R$ 2,519,658 R$ 1,889,695
Profit or loss on provision 746,962 338,110
ICMS [member]    
Disclosure Of Recoverable Income Tax and Social Contribution Taxes [line items]    
Recoverable taxes 1,129,325 872,670
PIS and COFINS [member]    
Disclosure Of Recoverable Income Tax and Social Contribution Taxes [line items]    
Recoverable taxes R$ 1,297,029 930,570
Oxiteno S.A. and Oxiteno Nordeste [member] | Top of range [member]    
Disclosure Of Recoverable Income Tax and Social Contribution Taxes [line items]    
Realization of tax credit period 5 years  
Other Subsidiaries [member] | Top of range [member]    
Disclosure Of Recoverable Income Tax and Social Contribution Taxes [line items]    
Realization of tax credit period 2 years  
Subsidiaries Oxiteno S.A., Empresa Carioca de Produtos Químicos S.A. (“EMCA”) e Oleoquímica Indústria e Comércio de Produtos Químicos Ltda. (“Oleoquímica”) [member] | ICMS [member]    
Disclosure Of Recoverable Income Tax and Social Contribution Taxes [line items]    
Recoverable taxes R$ 195,037 151,393
Subsidiaries Ipiranga Produtos de Petróleo S.A. (“IPP”), Bahiana Distribuidora de Gás Ltda. (“Bahiana”), Ultragaz, AMPM, Iconic Lubrificantes S.A. (“Iconic”) [member] | ICMS [member]    
Disclosure Of Recoverable Income Tax and Social Contribution Taxes [line items]    
Recoverable taxes 754,882 563,565
Subsidiary Extrafarma [member] | ICMS [member]    
Disclosure Of Recoverable Income Tax and Social Contribution Taxes [line items]    
Recoverable taxes 179,405 157,713
Subsidiaries Extrafarma, Tropical Transportes Ipiranga Ltda (“Tropical”), EMCA, Oleoquímica and Oxiteno S.A. [member]    
Disclosure Of Recoverable Income Tax and Social Contribution Taxes [line items]    
Recoverable taxes 645,978 391,544
Brazilian Federal Revenue Service [member] | PIS and COFINS [member]    
Disclosure Of Recoverable Income Tax and Social Contribution Taxes [line items]    
Recoverable taxes R$ 651,051 R$ 539,026