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Financial Risks - Schedule of Parallel Movement of Yield Curve (Detail) - EUR (€) | 12 Months Ended
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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

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- Details
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