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Income and Social Contribution Taxes - Additional Information (Detail) - BRL (R$) R$ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Disclosure of related party [line items]
Tax losses and negative basis for social contribution carryforwards	R$ 208,036	R$ 201,471
Deferred taxes not recognized due to the uncertainty of realization	220,832	128,418
Deferred tax assets reversed	39,462
offshore subsidiaries [member]
Disclosure of related party [line items]
Tax loss carryforwards related to income tax	620,906	388,178
Tax loss carryforwards related to income tax	620,906	388,178
IRPJ [member]
Disclosure of related party [line items]
Tax loss carryforwards related to income tax	873,718	576,948
Tax loss carryforwards related to income tax	873,718	576,948
CSLL [member]
Disclosure of related party [line items]
Tax loss carryforwards related to income tax	876,315	576,949
Tax loss carryforwards related to income tax	R$ 876,315	R$ 576,949

X

- Definition

The amount of deferred tax asset when: (a) the utilisation of the deferred tax asset is dependent on future taxable profits in excess of the profits arising from the reversal of existing taxable temporary differences; and (b) the entity has suffered a loss in either the current or preceding period in the tax jurisdiction to which the deferred tax asset relates. [Refer: Temporary differences [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 82
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-URIDate 2018-03-16

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- Definition

Tax losses and negative basis for social contribution carryforwards.

+ References

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- Definition

Deferred Taxes Not Recognized Due To Uncertainty Of Realization

+ References

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Line items represent concepts included in a table. Disclosure of related party.

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- Definition

Tax loss carryforwards related to income tax.

+ References

No definition available.

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