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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Summary of segment information [line items]      
Total additions to property, plant, and equipment and intangible assets (see Notes 13 and 14) R$ 1,203,077 R$ 1,439,607 R$ 1,546,927
Asset retirement obligation - fuel tanks (see Note 20) 20 (264) (537)
Depreciation and amortization charges: 844,647 812,489 704,544
Capitalized borrowing costs (30,748) (23,438) (22,243)
Total investments in property, plant, and equipment and intangible assets (cash flow) 1,172,039 1,415,905 1,524,147
Payments of contractual assets with customers - exclusive rights (330,068) (390,177) (529,732)
Amortization of contractual assets with customers - exclusive rights 355,250 371,825 463,049
Amortization of right to use assets 300,058    
Total assets (excluding intersegment account balances): 31,195,472 30,499,395 28,284,346
Ultragaz [member]      
Summary of segment information [line items]      
Total additions to property, plant, and equipment and intangible assets (see Notes 13 and 14) 249,784 245,069 244,187
Depreciation and amortization charges: 186,221 222,527 182,833
Amortization of contractual assets with customers - exclusive rights 195    
Amortization of right to use assets 31,264    
Total assets (excluding intersegment account balances): 2,998,623 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) 370,864 417,519 536,936
Depreciation and amortization charges: 290,747 283,426 245,424
Payments of contractual assets with customers - exclusive rights 330,068 390,177 529,732
Amortization of contractual assets with customers - exclusive rights 355,055 371,825 463,049
Amortization of right to use assets 164,543    
Total assets (excluding intersegment account balances): 16,278,320 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) 255,016 473,026 466,967
Depreciation and amortization charges: 212,328 167,357 153,110
Amortization of right to use assets 9,676    
Total assets (excluding intersegment account balances): 7,453,476 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) 217,377 167,034 105,028
Depreciation and amortization charges: 59,618 52,414 47,669
Amortization of right to use assets 20,673    
Total assets (excluding intersegment account balances): 1,871,799 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) 89,850 118,577 171,183
Depreciation and amortization charges: 80,550 71,552 60,856
Amortization of right to use assets 73,774    
Total assets (excluding intersegment account balances): 2,060,182 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) 1,182,891 1,421,225 1,524,301
Depreciation and amortization charges: 829,464 797,276 689,892
Amortization of right to use assets 299,930    
Total assets (excluding intersegment account balances): 30,662,400 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) 20,186 18,382 22,626
Depreciation and amortization charges: 15,183 15,213 14,652
Amortization of right to use assets 128    
Total assets (excluding intersegment account balances): R$ 533,072 R$ 1,359,154 R$ 586,753