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Employee Benefits - Schedule of Share-based Compensation Expenses Recognized as Employee Benefit Expenses (Detail) - EUR (€)
€ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disclosure Of Share Of Equity Investment [line items]        
Stock award expense € 1,806 € 2,109 € 3,058 € 4,554
R&D costs [member]        
Disclosure Of Share Of Equity Investment [line items]        
Stock award expense 715 714 1,482 1,525
Management and administration costs [member]        
Disclosure Of Share Of Equity Investment [line items]        
Stock award expense 919 1,343 1,255 2,852
Other expenses [member]        
Disclosure Of Share Of Equity Investment [line items]        
Stock award expense € 172 € 52 € 321 € 177