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Right-of-use-assets - Summary of Breakdown of Right-of-use Assets Based on Geographical Location (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets € 42,825 € 50,755 € 49,013
United States of America [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 18,938 15,853  
Italy [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 9,249 11,977  
Spain [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 3,473 4,809  
United Kingdom [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 4,985 7,625  
China [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 2,493 4,076  
Other countries [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets € 3,687 € 6,415