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24. Operating segment information (Details 1) - BRL (R$) R$ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Segment Information Details 1 |  |  |
Gross revenue from construction recognized under IFRIC 12 | R$ 3,150,877 | R$ 3,732,877 | R$ 336,716
Construction costs recognized under IFRIC 12 | (3,080,542) | (3,651,364) | (3,263,808)
Construction margin | R$ (70,335) | R$ (81,513) | R$ (72,908)

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- Definition The profit (loss) recognised on exchanging construction services for an intangible asset in service concession arrangements. [Refer: Service concession arrangements [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name SIC -Number 29 -IssueDate 2017-01-01 -Paragraph 6A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=SIC&num=29&date=2017-03-01&anchor=para_6A&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of revenue recognised when construction services are exchanged for an intangible asset in service concession arrangements. [Refer: Service concession arrangements [member]; Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name SIC -Number 29 -IssueDate 2017-01-01 -Paragraph 6A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=SIC&num=29&date=2017-03-01&anchor=para_6A&doctype=Standard -URIDate 2017-03-09 + Details
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