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Presentation of Financial Statements and Summary of Significant Accounting Policies - Additional Information (Detail) R$ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 BRL (R$) | Dec. 31, 2017 BRL (R$) | Dec. 31, 2016 BRL (R$) | Dec. 31, 2015 BRL (R$)
Basis Of Presentation And Summary Of Significant Accounting Policies [line items] |  |  |  |
Research and development expense recognized | R$ 63,085 | R$ 55,836 | R$ 50,129 |
Cumulative translation adjustments | 65,857 | 53,061 | 7,519 | R$ 66,925
Impairment loss recognized | 5,565 |  |  |
Gains and losses from changes in foreign investments | 4,090 | R$ 7,368 | 3,425 |
Impairment loss | 5,565 |  | 2,114 |
Oxiteno S. A. Industria e Comercio [member] |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [line items] |  |  |  |
Impairment loss recognized | R$ 5,565 |  |  |
Purchase Exchange Rate [member] |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [line items] |  |  |  |
Variable exchange rate VES/US$ | 638.18 |  |  |
Sale Exchange Rate [member] |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [line items] |  |  |  |
Variable exchange rate VES/US$ | 636.58 |  |  |
Goodwill [member] |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [line items] |  |  |  |
Impairment loss |  |  | 1,695 |
Intangible assets other than goodwill [member] |  |  |  |
Basis Of Presentation And Summary Of Significant Accounting Policies [line items] |  |  |  |
Impairment loss |  |  | R$ 419 |

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