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Related parties' transactions - Summary of Relationships with Related Parties (Detail) - EUR (€)
€ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of transactions between related parties [abstract]    
Short-term benefits € 3,064 € 2,497
Post-employment benefits 53 70
Termination benefits 4,092  
Share-based payment 2,359 7,566
Total € 9,567 € 10,133