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Principles of Consolidation, Investments in Subsidiaries, Acquisitions Under Approval and Business Combination - Summary of goodwill (Detail) - BRL (R$) R$ in Thousands | Dec. 31, 2018 | Jan. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2017 | Nov. 17, 2016
--- | --- | --- | --- | --- | ---
Summary of principles of consolidation [line items] |  |  |  |  |
Consideration transferred |  |  |  |  | R$ 2,665,000
Non-controllinginterest | R$ 351,924 |  | R$ 377,824 | R$ 30,855 |
Acquisition date [member] |  |  |  |  |
Summary of principles of consolidation [line items] |  |  |  |  |
Consideration transferred |  |  | 351,258 |  |
Total assets acquired |  |  | (898,374) |  |
Total liabilities assumed |  |  | 395,784 |  |
Non-controllinginterest |  |  | 221,139 |  |
Goodwill |  |  | 69,807 |  |
TEAS Terminal Exportador de Alcool de Santos Ltda. [member] |  |  |  |  |
Summary of principles of consolidation [line items] |  |  |  |  |
Consideration transferred | 103,373 | R$ 103,373 |  |  |
Total assets acquired | (105,611) |  |  |  |
Total liabilities assumed | 3,035 |  |  |  |
Goodwill | R$ 797 | R$ 797 |  |  |
Temporary amount [member] | Acquisition date [member] |  |  |  |  |
Summary of principles of consolidation [line items] |  |  |  |  |
Consideration transferred |  |  | 356,077 |  |
Total assets acquired |  |  | (765,673) |  |
Total liabilities assumed |  |  | 350,666 |  |
Non-controllinginterest |  |  | 182,603 |  |
Goodwill |  |  | 123,673 |  |
Adjustments [member] | Acquisition date [member] |  |  |  |  |
Summary of principles of consolidation [line items] |  |  |  |  |
Consideration transferred |  |  | 4,819 |  |
Total assets acquired |  |  | (132,701) |  |
Total liabilities assumed |  |  | 45,118 |  |
Non-controllinginterest |  |  | 38,536 |  |
Goodwill |  |  | R$ (53,866) |  |

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