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Relationships with Related Parties - Summary of Relationships with Related Parties (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of transactions between related parties [line items]
Related party compensation	€ 15,353	€ 16,891	€ 7,205
Executive Committee [member]
Disclosure of transactions between related parties [line items]
Related party compensation	2,184	2,268	1,768
Members of the Board of Directors [member]
Disclosure of transactions between related parties [line items]
Related party compensation	745	714	605
Share-based payments to members of the Board of Directors	12,018	13,714	4,637
Directors Fees [member]
Disclosure of transactions between related parties [line items]
Related party compensation	€ 407	€ 195	€ 195

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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.

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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

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- Definition

The amount of compensation to key management personnel in the form of share-based payments. [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
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_17_e&doctype=Standard
-URIDate 2017-03-09

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