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Property, Plant and Equipment - Summary of Property, Plant and Equipment by Country (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment € 111,086 € 115,190 € 121,705
Italy [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 61,271 64,117  
Romania [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 23,406 24,157  
United States of America [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 17,830 16,440  
Brazil [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 4,552 5,009  
China [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 2,562 4,908  
Europe [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 1,463 555  
Other countries [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment € 2 € 4