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Employees' Leaving Entitlement - Schedule of Expected Payments or Contributions to Defined Benefit Plan (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Within 1 year [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Expected payments or contributions to defined benefit plan € 1,065 € 1,199
Between 2 and 5 years [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Expected payments or contributions to defined benefit plan € 4,181 € 4,441