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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
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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 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 -Name IAS -Number 1 -IssueDate 2018-01-01 -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 + Details
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