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Commitments and Contingent Liabilities - Additional information (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of finance lease and operating lease by lessee [line items]    
Rental expense € 17,218 € 16,707
Guarantees [member]    
Disclosure of finance lease and operating lease by lessee [line items]    
Contingent liability € 1,620 € 1,737