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Non-Current Provisions - Schedule of Non-Current Provisions (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of other provisions [abstract]        
Pension retirement obligations € 1,260 € 853 € 490  
Total € 1,260 € 853 € 490 € 531