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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets € 50,444 € 42,825 € 50,755
United States of America [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 25,901 18,938  
Italy [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 12,523 9,249  
Spain [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 2,548 3,473  
United Kingdom [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 6,126 4,985  
China [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 417 2,493  
Other countries [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets € 2,929 € 3,687