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Provisions and Contingencies - Additional information (Detail)
R$ in Thousands
 12 Months Ended
Sep. 12, 2019
BRL (R$)
May 15, 2019
BRL (R$)
Mar. 15, 2017
BRL (R$)
Dec. 31, 2019
BRL (R$)
Claim
Dec. 31, 2018
BRL (R$)
Claim
Dec. 01, 2019
BRL (R$)
Dec. 01, 2018
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$ 515,825 R$ 500,260          
Profit or loss on provision     R$ 338,110 141,618 291,278          
Provisions for lawsuits and administrative proceedings       85,855 90,932          
Provisions for labor litigation filed by former employees       98,010 101,173          
Possible contingency       2,840,086 2,839,219          
Contingent liabilities for tax matters and social security       2,028,159 1,941,749          
IPIContingency       173,738 168,391          
Legal Proceedings Related To Icms       836,822 836,393          
ICMS credits       319,849 318,550          
Reversal of ICMS credits       126,772 126,639          
Reversal of alleged non-payment       92,567 125,703          
Reversal of inventory differences       172,736 185,512          
Reversal of conditioned fruition of fiscal incentive       117,753          
Offset claims and credit dis-allowances       699,360 674,126          
Amortization of goodwill paid on acquisition of subsidiary       208,449 193,771          
Contingent liabilities for civil, environmental and regulatory claims       R$ 549,664 R$ 624,457          
Number of lawsuits for civil, environmental and regulatory claims | Claim       3,109 3,520          
Penalty on Ultragaz       R$ 33,603 R$ 32,983          
Contingent liabilities not recognized to lawsuits       11,403 62,930          
Contingent liabilities not recognized to extrajudicial lawsuits       0 3,426          
Contingent liabilities for labor matters       R$ 262,263 R$ 273,013          
Number of lawsuits for labor matters | Claim       1,649 1,726          
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]                    
Penalty on administrative proceedings       R$ 40,693            
Compensation suit against damages   R$ 67,539                
Tequimar Vila do Conde Logstica Porturia SA [member]                    
Disclosure of collateral and contractual commitments [line items]                    
Contingency expense       65,539            
Remaining contingent consideration       15,000            
Tequimar Vila do Conde Logstica Porturia SA [member] | TAC [member]                    
Disclosure of collateral and contractual commitments [line items]                    
Contingency expense       67,539            
Tequimar Vila do Conde Logstica Porturia SA [member] | Complementary Allocation [member]                    
Disclosure of collateral and contractual commitments [line items]                    
Contingency expense       R$ 13,000            
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$ 5,423 R$ 3,609 R$ 188,073 R$ 191,110 R$ 198,900