Total revenue and Income (Parenthetical) (Detail) - BRL (R$) R$ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Foreign currency gain on the currency conversion	R$ 89,866
Cash and Cash Equivalents
Financial income on investments	R$ 25,694	R$ 360

The net gain arising from foreign exchange differences. [Refer: Foreign exchange gain (loss)]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 21
-IssueDate 2017-01-01
-Paragraph 52
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2017-03-01&anchor=para_52_a&doctype=Standard
-URIDate 2017-03-09

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration