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Provisions and Contingencies - Additional information (Detail)
R$ in Thousands
 12 Months Ended
May 15, 2019
BRL (R$)
Dec. 31, 2020
BRL (R$)
claim
Dec. 31, 2019
BRL (R$)
claim
Dec. 01, 2020
BRL (R$)
Dec. 01, 2019
BRL (R$)
Dec. 01, 2017
BRL (R$)
Nov. 22, 2017
BRL (R$)
Sep. 06, 2017
BRL (R$)
Disclosure of collateral and contractual commitments [line items]                
Escrow deposits made under preliminary injunction   R$ 523,136 R$ 515,825          
Profit or loss on provision   746,962 338,110          
Provisions for lawsuits and administrative proceedings   57,772 85,855          
Provisions for labor litigation filed by former employees   90,675 98,010          
Possible contingency   3,236,982 2,840,086          
Contingent liabilities for tax matters and social security   2,419,000 2,028,159          
IPIContingency   176,390 173,738          
Legal Proceedings Related To Icms   958,134 836,822          
ICMS credits   300,707 319,849          
Reversal of ICMS credits   92,687 126,772          
Reversal of alleged non-payment   98,157 92,567          
Reversal of inventory differences   269,581 172,736          
Reversal of conditioned fruition of fiscal incentive   119,894 117,753          
Offset claims and credit dis-allowances   709,338 699,360          
Amortization of goodwill paid on acquisition of subsidiary   212,350 208,449          
Contingent liabilities for civil, environmental and regulatory claims   R$ 561,713 R$ 549,664          
Number of lawsuits for civil, environmental and regulatory claims | claim   2,840 3,109          
Penalty on Ultragaz   R$ 33,895 R$ 33,603          
Contingent liabilities not recognized to lawsuits   4,428 11,403          
Contingent liabilities for labor matters   R$ 256,269 R$ 262,263          
Number of lawsuits for labor matters | claim   1,306 1,649          
Compensation suit against damages R$ 67,539              
Fisheries management project [member]                
Disclosure of collateral and contractual commitments [line items]                
Compensation amount paid   R$ 13,000            
Subsidiary IPP [member]                
Disclosure of collateral and contractual commitments [line items]                
Provisions for lawsuits and administrative proceedings   27,995            
Penalty on administrative proceedings   R$ 40,693            
Bottom of range [member]                
Disclosure of collateral and contractual commitments [line items]                
Percentage of possible loss contingency   25.00%            
Top of range [member]                
Disclosure of collateral and contractual commitments [line items]                
Percentage of possible loss contingency   50.00%            
Cia. Ultragaz and Bahiana [member]                
Disclosure of collateral and contractual commitments [line items]                
Liability provisions             R$ 95,987 R$ 2,154
Three employees and one former employee [member]                
Disclosure of collateral and contractual commitments [line items]                
Liability provisions             R$ 1,100  
Two former employees, each [member]                
Disclosure of collateral and contractual commitments [line items]                
Liability provisions               R$ 50
Chevron and subsidiary IPP [member]                
Disclosure of collateral and contractual commitments [line items]                
Liability provisions   R$ 101,663 R$ 5,423 R$ 102,777 R$ 188,073 R$ 198,900    
PIS and COFINS [member]                
Disclosure of collateral and contractual commitments [line items]                
Profit or loss on provision   R$ 215,365 R$ 141,618