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Principles of Consolidation, Investments in Subsidiaries, Acquisitions Under Approval and Business Combination - Consolidated information (Detail) - BRL (R$) R$ / shares in Units, R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Summary of principles of consolidation [line items] |  |
Net revenue from sales and services |  | R$ 80,007,676
Operating income |  | 2,760,458
Net income for the year |  | R$ 1,507,074
Earnings per share basic - whole R$ (see Note 31) |  | R$ 1.3911
Earnings per share diluted - whole R$ (see Note 31) |  | R$ 1.3812
TEAS Terminal Exportador de Alcool de Santos Ltda. [member] |  |
Summary of principles of consolidation [line items] |  |
Net revenue from sales and services | R$ 90,697,983 |
Operating income | 1,899,481 |
Net income for the year | R$ 1,132,468 |
Earnings per share basic - whole R$ (see Note 31) | R$ 1.0613 |
Earnings per share diluted - whole R$ (see Note 31) | R$ 1.0543 |

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