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Property, Plant and Equipment - Summary of Property, Plant and Equipment by Country (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment € 102,523 € 111,086 € 115,190
Italy [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 57,035 61,271  
Romania [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 19,831 23,406  
United States of America [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 17,800 17,830  
Brazil [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 4,250 4,552  
China [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 2,334 2,562  
Europe [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 1,260 1,463  
Other countries [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment € 13 € 2