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Income and Social Contribution Taxes - Summary of tax loss carryforwards (Detail) R$ in Thousands, $ in Thousands | Dec. 31, 2020 BRL (R$) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 BRL (R$) | Dec. 31, 2019 USD ($)
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Disclosure of deferred income and social contribution tax assets [Line Items] |  |  |  |
Tax loss carryforwards | R$ 1,205,849 | $ 232,041 | R$ 816,802 | $ 202,645
Oxiteno USA [member] |  |  |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |  |  |
Tax loss carryforwards | 1,132,035 | 217,837 | 744,797 | 184,781
Oxiteno Uruguay [member] |  |  |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |  |  |
Tax loss carryforwards | 41,279 | 7,943 | 30,005 | 7,444
Ultrapar International [member] |  |  |  |
Disclosure of deferred income and social contribution tax assets [Line Items] |  |  |  |
Tax loss carryforwards | R$ 32,535 | $ 6,261 | R$ 42,000 | $ 10,420

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