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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Impacts of IFRS Adjustments for Property, Plant and Equipment (Detail) - EUR (€) € in Thousands	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of comparative information prepared under previous GAAP [line items]
Property plant and equipment	€ 111,086	€ 115,190	€ 121,705
Previous GAAP [member]
Disclosure of comparative information prepared under previous GAAP [line items]
Property plant and equipment		107,917	115,924
Effect of transition to IFRSs [member]
Disclosure of comparative information prepared under previous GAAP [line items]
Property plant and equipment		7,273	5,781
Functional currency adjustment [member] | Effect of transition to IFRSs [member]
Disclosure of comparative information prepared under previous GAAP [line items]
Property plant and equipment		7,602	6,180
Costs not eligible for capitalization [member] | Effect of transition to IFRSs [member]
Disclosure of comparative information prepared under previous GAAP [line items]
Property plant and equipment		€ (329)	€ (399)

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- Definition

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+ References

No definition available.

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- Definition

The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2018-01-01
-Paragraph 73
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 54
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_a&doctype=Standard
-URIDate 2018-03-16

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