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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Impacts of IFRS Adjustments for Employee's Leaving Entitlement (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] |  |  |
Non current recognised liabilities defined benefit plan | € 17,181 | € 18,820 | € 19,426
Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Non current recognised liabilities defined benefit plan |  | 17,210 | 17,791
Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Non current recognised liabilities defined benefit plan |  | 1,610 | 1,635
IAS 19 adjustment - employees' leaving entitlement [member] | Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Non current recognised liabilities defined benefit plan |  | € 1,610 | € 1,635

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- Definition The amount of non-current net defined benefit liability. [Refer: Net defined benefit liability] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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