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Employees' Leaving Entitlement - Summary of Changes To Employees' Leaving Entitlement (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Changes in net defined benefit liability (asset) [abstract]    
Beginning balance € 18,820 € 19,426
Current service cost 148 119
Interest expense 235 247
Benefits paid (1,449) (1,080)
Actuarial (gains) losses (573) 108
Ending balance € 17,181 € 18,820