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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets € 49,013 € 54,718 € 55,798
United States of America [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 14,643 18,661  
Italy [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 9,671 11,743  
Spain [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 5,382 4,179  
United Kingdom [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 9,274 11,119  
China [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 5,484 2,881  
Other countries [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets € 4,559 € 6,135