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Intangible assets and goodwill (Details Textual) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Explanation of period over which management has projected cash flows | 5 |
Discount rate applied to cash flow projections | 8.04% |
Useful lives or amortisation rates, intangible assets other than goodwill |  | Useful life
Bottom of range [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 3 |
Top of range [member] |  |
Disclosure Of Intangible Assets And Goodwill [Line Items] |  |
Useful lives or amortisation rates, intangible assets other than goodwill | 6 |

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- Definition The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_d_v&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_e_v&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The explanation of the period over which management has projected cash flows based on financial budgets/forecasts approved by management including, when a period greater than five years is used for a cash-generating unit (group of units), an explanation of why that longer period is justified. [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph d -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_d_iii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_e_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The useful lives or amortisation rates used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 118 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Details
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