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Trade Payables - Additional Information (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of trade payables [line items]    
Trade payables € 68,476 € 77,901
Trade payables due to related parties 124 1,004
Currency denominated, foreign currency [member]    
Disclosure of trade payables [line items]    
Trade payables € 26,065 € 29,155