Total revenue and Income (Parenthetical) (Detail) - BRL (R$) R$ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Statement [LineItems]
Foreign currency gain on the currency conversion	R$ 131,212
Cash and Cash Equivalents
Statement [LineItems]
Financial income on investments	R$ 138,027	R$ 6,722

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 2018-01-01
-Paragraph 52
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2018-03-01&anchor=para_52_a&doctype=Standard
-URIDate 2018-03-16

Name:	ifrs-full_NetForeignExchangeGain
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration