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Financial Risks - Schedule of Parallel Movement of Yield Curve (Detail) - EUR (€)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Shift up 100 basis points [member]    
Effect of changes in foreign interest rates [line items]    
Estimated approximate effects on net income € 945 € (677)
Estimated approximate effects on shareholders' equity (2,688) (3,892)
Shift down 100 basis points [member]    
Effect of changes in foreign interest rates [line items]    
Estimated approximate effects on net income (1,236) 1,188
Estimated approximate effects on shareholders' equity € 1,847 € 2,819