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Employees' Leaving Entitlement - Summary of Changes To Employees' Leaving Entitlement (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in net defined benefit liability (asset) [abstract]    
Beginning balance € 17,181 € 18,820
Current service cost 111 148
Interest expense 253 235
Benefits paid (2,039) (1,449)
Actuarial gains/(losses) 615 (573)
Ending balance € 16,121 € 17,181