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Basis for preparation, consolidation and accounting policies (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Useful lives or depreciation rates, investment property, cost model | 20 |  |
Workers' profit sharing rate | 8.00% |  |
Qualifying asset, description | A qualifying asset is one whose value is greater than US$5 million and requires a longer period to 12 months to get ready for its intended use |  |
Applicable tax rate | 29.50% | 32.00% | 32.00%
OSINERGMIN [Member] |  |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Contribution rate on sales invoice value | 0.15% | 0.16% | 0.19%
OEFA [Member] |  |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Contribution rate on sales invoice value | 0.11% | 0.13% | 0.15%
Administrative expense [Member] |  |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Amount of reclassifications or changes in presentation |  |  | $ 6.3
Other property, plant and equipment [member] |  |  |
Disclosure of basis for preparation, consolidation and accounting policies [Line Items] |  |  |
Amount of reclassifications or changes in presentation |  | $ 4.3 |

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- Definition The amount that is reclassified when the entity changes classification or presentation in its financial statements. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 41 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_41_b&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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