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Income Taxes - Reconciliation of Income Tax Expense (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure of income tax reconciliation [abstract]
Income tax and social contribution tax rate	34.00%	34.00%	34.00%

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- Definition

Disclosure of income tax reconciliation [abstract]

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No definition available.

+ Details

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- Definition

Income tax rate.

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No definition available.

+ Details

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