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8. Restricted cash (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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SummaryOfRestrictedCashLineItems [Line Items] |  |
Restricted cash | R$ 18,822 | R$ 24,078
Agreement with the Sao Paulo municipal government |  |
SummaryOfRestrictedCashLineItems [Line Items] |  |
Restricted cash | 12,055 | 15,858
Brazilian Federal Savings - escrow deposit |  |
SummaryOfRestrictedCashLineItems [Line Items] |  |
Restricted cash | 1,209 | 2,989
Other |  |
SummaryOfRestrictedCashLineItems [Line Items] |  |
Restricted cash | R$ 5,558 | R$ 5,231

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- Definition The amount of cash and cash equivalents whose use or withdrawal is restricted. [Refer: Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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