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Share Capital, Reserves and Retained Earnings - Disclosure of Disaggregation of Changes of OCI (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Share Capital Reserves and Other Equity Interest [line items]
Exchange difference on translation of foreign operations	€ 475	€ 497	€ (7,778)
Share of OCI of equity-method investees	111	(246)
Actuarial losses/gains on employees' leaving entitlement	(615)	573	(116)
Total	(29)	824	(7,894)
IAS 19 reserve [member]
Disclosure of Share Capital Reserves and Other Equity Interest [line items]
Exchange difference on translation of foreign operations	475	497	(7,778)
Share of OCI of equity-method investees	111	(246)
Total	586	251	(7,778)
Remeasurement of defined benefit obligation [member]
Disclosure of Share Capital Reserves and Other Equity Interest [line items]
Actuarial losses/gains on employees' leaving entitlement	(615)	573	116
Total	€ (615)	€ 573	€ 116

X

- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2019-01-01
-Paragraph 141
-Subparagraph d
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- Definition

The amount of other comprehensive income, before tax, related to exchange differences on translation of financial statements of foreign operations. [Refer: Other comprehensive income, before tax]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2019-01-01
-Paragraph 91
-Subparagraph b
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, net of tax. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective on first application of IFRS 9
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-IssueDate 2019-01-01
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-Subparagraph b
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-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2019-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2019-01-01
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-Subparagraph a
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-URIDate 2019-03-27

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Total disaggregation of changes in other comprehensive income.

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