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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets € 50,755 € 49,013 € 54,718
United States of America [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 15,853 14,643  
Italy [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 11,977 9,671  
Spain [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 4,809 5,382  
United Kingdom [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 7,625 9,274  
China [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 4,076 5,484  
Other countries [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets € 6,415 € 4,559