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24. Operating segment information (Details 1) - BRL (R$) R$ in Thousands	12 Months Ended
	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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- 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
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-Number 29
-IssueDate 2017-01-01
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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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