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17. Taxes recoverable/payable (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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SummaryOfTaxesRecoverablePayableLineItems [Line Items] |  |
Current tax assets | R$ 276,585 | R$ 42,633
Income tax and social contribution |  |
SummaryOfTaxesRecoverablePayableLineItems [Line Items] |  |
Current tax assets | 270,614 | 32,365
Withholding income tax on financial investments For - IRRF |  |
SummaryOfTaxesRecoverablePayableLineItems [Line Items] |  |
Current tax assets | 2,606 | 7,057
Other federal taxes |  |
SummaryOfTaxesRecoverablePayableLineItems [Line Items] |  |
Current tax assets | 3,365 | 2,961
Other municipal taxes |  |
SummaryOfTaxesRecoverablePayableLineItems [Line Items] |  |
Current tax assets | R$ 0 | R$ 250

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- Definition The excess of amount paid for current tax in respect of current and prior periods over the amount due for those periods. Current tax is the amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph n -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_n&doctype=Standard -URIDate 2017-03-09 + Details
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