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Relationships with Related Parties - Additional Information (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [line items]      
Compensation awarded to board of directors and executive committee € 15,353 € 16,891 € 7,205
Commercial strategy consulting works [member]      
Disclosure of transactions between related parties [line items]      
Compensation awarded to board of directors and executive committee € 45