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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
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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

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