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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets € 44,378 € 50,444 € 42,825
United States of America [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 21,810 25,901  
Italy [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 12,008 12,523  
Spain [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 1,424 2,548  
United Kingdom [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 4,591 6,126  
China [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 2,923 417  
Other countries [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets € 1,622 € 2,929