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Provisions and Contingencies - Additional information (Detail)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
BRL (R$)
Claim
Dec. 31, 2017
BRL (R$)
Claim
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$ 500,260 R$ 483,485        
Reversed of the provision 23,376          
Profit or loss on provision 291,278          
Provisions for lawsuits and administrative proceedings 90,932 89,296        
Provisions for labor litigation filed by former employees 101,173 82,425        
Possible contingency 2,839,219 2,576,583        
Contingent liabilities for tax matters and social security 1,941,749 1,709,435        
IPIContingency 168,391 166,003        
Legal Proceedings Related To Icms 836,393 618,774        
ICMS credits 318,550 307,255        
Reversal of ICMS credits 126,639 121,891        
Reversal of alleged non-payment 125,703 113,999        
Reversal of inventory differences 185,512 149,171        
Reversal of conditioned fruition of fiscal incentive 121,745 0        
Offset claims and credit dis-allowances 674,126 645,868        
Amortization of goodwill paid on acquisition of subsidiary 193,771 187,027        
Contingent liabilities for civil, environmental and regulatory claims R$ 624,457 R$ 593,437        
Number of lawsuits for civil, environmental and regulatory claims | Claim 3,520 2,783        
Penalty on Ultragaz R$ 32,983 R$ 32,315        
Contingent liabilities not recognized to lawsuits 62,930 88,075        
Contingent liabilities not recognized to extrajudicial lawsuits 3,426 25,852        
Contingent liabilities for labor matters R$ 273,013 R$ 273,711        
Number of lawsuits for labor matters | Claim 1,726 1,899        
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$ 3,609 R$ 3,452 R$ 191,110 R$ 198,900    
PIS and COFINS [member]            
Disclosure of collateral and contractual commitments [line items]            
Reversed of the provision R$ 9,536 R$ 109,463