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26. Operating segment information (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Segment Information Details 1Abstract
Gross revenue from construction recognized under IFRIC 12	R$ 2,802,670	R$ 3,150,877	R$ 3,732,877
Construction costs recognized under IFRIC 12	(2,739,657)	(3,080,542)	(3,651,364)
Construction margin	R$ (63,013)	R$ (70,335)	R$ (81,513)

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- References

No definition available.

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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 2018-01-01
-Paragraph 6A
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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]

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