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Supplemental pension plans (Details 2) - BRL (R$) R$ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Projected Benefit Obligations [Abstract]
Cost of service	R$ 186	R$ (1,077)	R$ (579)
Cost of interest on actuarial obligations	227,980	181,595	133,385
Expected earnings from the assets of the plan	(227,360)	(174,937)	(120,960)
Net cost/(benefit) of the pension plans	R$ 806	R$ 5,581	R$ 11,846

X

- Definition

Expected earnings from the assets of the plan

+ References

No definition available.

+ Details

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- Definition

Net cost/(benefit) of the pension plans

+ References

No definition available.

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- Definition

Projected benefit obligations:

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No definition available.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 141
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_a&doctype=Standard
-URIDate 2017-03-09

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 141
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_b&doctype=Standard
-URIDate 2017-03-09

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