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15. Property, plant and equipment (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | R$ 538,687 | R$ 544,693 |  |
Accumulated amortization | (283,637) | (242,310) |  |
Net | 255,050 | 302,383 | R$ 325,076 | R$ 304,845
Land |  |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | 92,507 | 92,494 |  |
Accumulated amortization | 0 | 0 |  |
Net | 92,507 | 92,494 | 102,708 | 100,533
Buildings |  |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | 79,013 | 77,548 |  |
Accumulated amortization | (36,653) | (34,286) |  |
Net | 42,360 | 43,262 | 45,891 | 42,515
Equipment |  |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | 330,753 | 338,696 |  |
Accumulated amortization | (226,950) | (189,556) |  |
Net | 103,803 | 149,140 | 162,218 | 146,922
Transportation |  |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | 10,862 | 11,141 |  |
Accumulated amortization | (7,182) | (6,610) |  |
Net | 3,680 | 4,531 | 5,692 | 7,613
Furniture and fixtures |  |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | 24,430 | 23,633 |  |
Accumulated amortization | (12,614) | (11,647) |  |
Net | 11,816 | 11,986 | 8,418 | 7,124
Other |  |  |  |
SummaryOfPropertyPlantAndEquipmentLineItems [Line Items] |  |  |  |
Cost | 1,122 | 1,181 |  |
Accumulated amortization | (238) | (211) |  |
Net | R$ 884 | R$ 970 | R$ 149 | R$ 138

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of property, plant and equipment that would have been recognised had the revalued assets been carried under the cost model. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 77 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_77_e&doctype=Standard -URIDate 2017-03-09 + Details
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