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Segment Information - Additions to Property, Plant, and Equipment and intangible Assets, Depreciation and Amortization Charges and Asset Reclassification (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2017
Summary of segment information [line items]        
Total additions to property, plant, and equipment and intangible assets (see Notes 13 and 14) R$ 1,439,607 R$ 1,546,927 R$ 1,166,044  
Asset retirement obligation - fuel tanks (see Note 20) (264) (537) (483)  
Depreciation and amortization charges: 812,489 704,544 628,156  
Capitalized borrowing costs (23,438) (22,243) (23,980)  
Total investments in property, plant, and equipment and intangible assets (cash flow) 1,415,905 1,524,147 1,141,581  
Payments of contractual assets with customers - exclusive rights 390,177 529,732 514,291  
Amortization of contractual assets with customers - exclusive rights 371,825 463,049 463,490  
Total assets (excluding intersegment account balances): 30,499,395 28,284,346   R$ 24,074,516
Ultragaz [member]        
Summary of segment information [line items]        
Total additions to property, plant, and equipment and intangible assets (see Notes 13 and 14) 245,069 244,187 248,627  
Depreciation and amortization charges: 222,527 182,833 158,193  
Total assets (excluding intersegment account balances): 2,719,425 2,408,600    
Ipiranga [member]        
Summary of segment information [line items]        
Total additions to property, plant, and equipment and intangible assets (see Notes 13 and 14) 417,519 536,936 387,138  
Depreciation and amortization charges: 283,426 245,424 220,282  
Payments of contractual assets with customers - exclusive rights 390,177 529,732 514,291  
Amortization of contractual assets with customers - exclusive rights 371,825 463,049 463,490  
Total assets (excluding intersegment account balances): 15,381,887 15,388,646    
Oxiteno [member]        
Summary of segment information [line items]        
Total additions to property, plant, and equipment and intangible assets (see Notes 13 and 14) 473,026 466,967 291,294  
Depreciation and amortization charges: 167,357 153,110 149,716  
Total assets (excluding intersegment account balances): 7,452,331 6,557,456    
Ultracargo [member]        
Summary of segment information [line items]        
Total additions to property, plant, and equipment and intangible assets (see Notes 13 and 14) 167,034 105,028 81,166  
Depreciation and amortization charges: 52,414 47,669 43,356  
Total assets (excluding intersegment account balances): 1,478,697 1,394,083    
Extrafarma [member]        
Summary of segment information [line items]        
Total additions to property, plant, and equipment and intangible assets (see Notes 13 and 14) 118,577 171,183 140,454  
Depreciation and amortization charges: 71,552 60,856 42,666  
Total assets (excluding intersegment account balances): 2,107,901 1,948,808    
Reportable segments [member]        
Summary of segment information [line items]        
Total additions to property, plant, and equipment and intangible assets (see Notes 13 and 14) 1,421,225 1,524,301 1,148,679  
Depreciation and amortization charges: 797,276 689,892 614,213  
Total assets (excluding intersegment account balances): 29,140,241 27,697,593    
Others [member]        
Summary of segment information [line items]        
Total additions to property, plant, and equipment and intangible assets (see Notes 13 and 14) 18,382 22,626 17,365  
Depreciation and amortization charges: 15,213 14,652 R$ 13,943  
Total assets (excluding intersegment account balances): R$ 1,359,154 R$ 586,753