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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
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