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Principles of Consolidation, Investments in Subsidiaries and Unrealized - Additional Information (Detail) - BRL (R$) R$ in Thousands | Mar. 09, 2018 | Aug. 04, 2016 | Dec. 31, 2018 | Jan. 30, 2018 | Nov. 17, 2016
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Disclosure of detailed information about business combination [line items] |  |  |  |  |
Percentage of equity interests acquired |  | 56.00% |  |  | 100.00%
Proportion of voting rights held by non-controlling interests |  | 44.00% |  |  |
Goodwill |  | R$ 69,807 |  |  |
Total consideration |  |  |  |  | R$ 2,665,000
Non-compliance fine paid | R$ 286,160 |  |  |  |
TEAS Terminal Exportador de Alcool de Santos Ltda. [member] |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Percentage of equity interests acquired |  |  |  | 100.00% |
Total consideration |  |  | R$ 103,373 | R$ 103,373 |
Goodwill |  |  | R$ 797 | R$ 797 |

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