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Relationships with Related Parties - Additional Information (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of transactions between related parties [line items] |  |  |
Compensation awarded to board of directors and executive committee | € 15,353 | € 16,891 | € 7,205
Commercial strategy consulting works [member] |  |  |
Disclosure of transactions between related parties [line items] |  |  |
Compensation awarded to board of directors and executive committee | € 45 |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_17&doctype=Standard -URIDate 2017-03-09 + Details
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Period Type: | duration

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- Details
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Balance Type: |
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