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Relationships with Related Parties - Schedule of Amounts Payable to Related Parties (Detail) - EUR (€) € in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of amount payables to related parties [Line Items] |  |  |
Amounts Payable | € 1,523 | € 1,304 | € 1,102
Directors Fees [member] |  |  |
Disclosure of amount payables to related parties [Line Items] |  |  |
Amounts Payable | 432 | 195 | 195
Compensation [member] |  |  |
Disclosure of amount payables to related parties [Line Items] |  |  |
Amounts Payable | 689 | 767 | 674
Pension obligation [member] |  |  |
Disclosure of amount payables to related parties [Line Items] |  |  |
Amounts Payable | € 402 | € 342 | € 233

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