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Commitments - Minimum Annual Purchases (Detail)	12 Months Ended
	Dec. 31, 2020
Commitments [abstract]
Minimum Annual Purchase Of Camacari	205,000
Minimum Annual Purchase Of Maua	44,100
Maturity of Commitment of Camacari	2021
Maturity of Commitment of Maua	2023

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- Definition

Commitments

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- Definition

Minimum Annual Purchase Of Camacari.

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- Definition

Minimum Annual Purchase Of Maua.

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Period of Maturity of Commitment.

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Period of Maturity of Commitment of Maua.

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