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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, 2020 | Dec. 31, 2019
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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$ 363,862 | R$ 278,140
Onshore [member] |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |
Tax losses and negative basis for social contribution carryforwards | 363,862 | 278,140
Tax losses and negative basis for social contribution carryforwards not constituted | 302,842 | 242,396
Oxiteno SA [member] | Onshore [member] |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |
Tax losses and negative basis for social contribution carryforwards | 205,604 | 148,306
Extrafarma [member] | Onshore [member] |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |
Tax losses and negative basis for social contribution carryforwards | 72,318 | 72,318
Tax losses and negative basis for social contribution carryforwards not constituted | 294,400 | 237,664
Ipiranga [member] | Onshore [member] |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |
Tax losses and negative basis for social contribution carryforwards | 44,537 |
Ultrapar [member] | Onshore [member] |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |
Tax losses and negative basis for social contribution carryforwards | 27,736 | 27,051
Iconic [member] | Onshore [member] |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |
Tax losses and negative basis for social contribution carryforwards | 5,691 |
Abastece Aí [member] | Onshore [member] |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |
Tax losses and negative basis for social contribution carryforwards | 7,362 |
Tequimar Vila do Conde [member] | Onshore [member] |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |
Tax losses and negative basis for social contribution carryforwards | 489 | 17,657
UVC Investimentos [member] | Onshore [member] |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |
Tax losses and negative basis for social contribution carryforwards | 18 |
Millennium [member] | Onshore [member] |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |
Tax losses and negative basis for social contribution carryforwards not constituted | 640 | 96
Ultracargo [member] | Onshore [member] |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |
Tax losses and negative basis for social contribution carryforwards | 107 |
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 not constituted | R$ 7,802 | 4,636
Cia Ultragaz [member] | Onshore [member] |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |
Tax losses and negative basis for social contribution carryforwards |  | R$ 12,808

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