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Income and Social Contribution Taxes - Summary of Recovery of Deferred Tax Assets (Detail) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Summary of income and social contribution taxes [line items] |  |
Recovery of deferred tax assets | R$ 959,945 | R$ 839,553
Up to 1 year [member] |  |
Summary of income and social contribution taxes [line items] |  |
Recovery of deferred tax assets | 181,343 |
From 1 to 2 years [member] |  |
Summary of income and social contribution taxes [line items] |  |
Recovery of deferred tax assets | 117,990 |
From 2 to 3 years [member] |  |
Summary of income and social contribution taxes [line items] |  |
Recovery of deferred tax assets | 172,439 |
From 3 to 5 years [member] |  |
Summary of income and social contribution taxes [line items] |  |
Recovery of deferred tax assets | 169,119 |
From 5 to 7 years [member] |  |
Summary of income and social contribution taxes [line items] |  |
Recovery of deferred tax assets | 224,291 |
From 7 to 10 Years[member] |  |
Summary of income and social contribution taxes [line items] |  |
Recovery of deferred tax assets | R$ 94,763 |

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