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Short-term Investments - Summary of Short-term Investments (Parenthetical) (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Short-term Investments [line items]
Listed securities indexed rate	100.00%	95.00%
Other comprehensive income [member]
Disclosure of Short-term Investments [line items]
Change in fair vair in OCI	R$ (938)	R$ 954

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- Definition

Change in fair value of unlisted securities.

+ References

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- Definition

Disclosure of short-term investments.

+ References

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X

- Definition

Percentage of listed securities indexed rate.

+ References

No definition available.

+ Details

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- Details

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