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Risks and Financial Instruments - Positions of derivative financial instruments to hedge commodity price risk (Detail) - Commodity price risk [member] R$ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 BRL (R$)	Dec. 31, 2019 BRL (R$)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Statement [Line Items]
Fair value	R$ (563)	R$ (1,271)
Term [member] | Heating Oil [member]
Statement [Line Items]
Notional amount (m3)	108,429	76,950
Notional amount | $			$ 42,399	$ 40,529
Fair value	R$ (563)	R$ (2,378)
Term [member] | RBOB [member]
Statement [Line Items]
Notional amount (m3)		64,867
Notional amount | $				$ 29,243
Fair value		R$ 1,107

X

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

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- Definition

Fair value - position of hedging instruments entered into by the Company and its subsidiaries. For each class of financial assets and financial liabilities, an entity shall disclose the fair value of that class of assets and liabilities.

+ References

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- Definition

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+ References

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