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Financial Investments - Additional Information (Detail) - Cash and Cash Equivalent and Financial Investments [member]	Dec. 31, 2018	Dec. 31, 2017
Brazil, Brazil Real [member]
Disclosure of financial assets [line items]
Weighted average interest rate	6.56%	10.18%
United States of America, Dollars [member]
Disclosure of financial assets [line items]
Weighted average interest rate	2.40%	1.70%

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- Definition

Weighted Average Interest Rate

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Details

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- Details

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- Details

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