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Non-Current Provisions - Schedule of Commitments for Compensation Payable to Employees Upon Their Retirement (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Retirement Benefits [Abstract]
Beginning balance	€ (853)	€ (490)	€ (531)
Costs of services rendered (operating expense)	(219)	(104)	(116)
Interest expense (finance expense)	(11)	(10)	(9)
Benefit paid	0	0	0
Actuarial gains	(177)	(249)	166
Ending balance	€ (1,260)	€ (853)	€ (490)

X

- Definition

Disclosure of Retirement Benefits [Abstract]

+ References

No definition available.

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2017-01-01
-Paragraph 141
-Subparagraph c
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- Definition

The amount of benefits paid or payable for retirement benefit plans.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of expense arising from interest.

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- Definition

The amount of non-current provisions. [Refer: Provisions]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2017-01-01
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- Definition

The amount of expense arising from services.

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