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Income and Social Contribution Taxes - Summary of deferred income and social contribution tax assets (Detail) - BRL (R$)
R$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards R$ 278,140 R$ 208,036
Offshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards 278,140 208,036
Onshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards 370,292 220,832
Cia Ultragaz [member] | Offshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards 12,808 37,332
Oxiteno SA [member] | Offshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards 148,306 43,645
Iconic [member] | Offshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards 17,657 28,256
Extrafarma [member] | Offshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards 72,318 98,803
Ultrapar [member] | Offshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards 24,632  
Ultrapar International [member] | Offshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards 2,419  
Extrafarma Two [member] | Onshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards 237,664 94,115
Integra Frotas [member] | Onshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards 4,636 1,365
Oxiteno Argentina [member] | Onshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards 0 22
Oxiteno USA [member] | Onshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards 127,992 124,864
Oxiteno Andina [member] | Onshore [member]    
Disclosure of deferred income and social contribution tax assets [Line Items]    
Tax losses and negative basis for social contribution carryforwards R$ 0 R$ 466