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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Effects of IFRS Adjustments on Finance Costs (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of comparative information prepared under previous GAAP [line items]
Finance costs	€ 5,580	€ 6,289	[1]
Previous GAAP [member]
Disclosure of comparative information prepared under previous GAAP [line items]
Finance costs		6,042
Effect of transition to IFRSs [member]
Disclosure of comparative information prepared under previous GAAP [line items]
Finance costs		247
IAS 19 adjustment - employees' leaving entitlement [member] | Effect of transition to IFRSs [member]
Disclosure of comparative information prepared under previous GAAP [line items]
Finance costs		€ (247)
[1] The Group has initially applied IFRS 9 as at January 1, 2018. Under the transition method chosen, comparative information has not been restated except for separately presenting impairment losses on trade receivables. See note 5.

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The amount of costs associated with financing activities of the entity.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 82
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_82_b&doctype=Standard
-URIDate 2018-03-16

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