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Property, Plant and Equipment - Summary of Breakdown of Property, Plant and Equipment by Country (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment € 83,054 € 85,306 € 102,523
Italy [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 45,470 45,895  
Romania [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 18,502 19,253  
United States of America [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 13,884 14,778  
Brazil [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 2,753 2,807  
Europe [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 1,253 1,461  
China [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment 810 1,109  
Other countries [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property, plant and equipment € 382 € 3