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Financial Instruments - Fair Values and Risk Management - Summary of Sensitivity to Reasonably Possible Change in Interest Rates on that Portion of Loans and Borrowings Affected (Detail) - Market risk [member] - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Increase in basis points [member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Effect on profit before tax | € 3,155 | € 2,776 | € 3,023
Decrease in basis points [member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Effect on profit before tax | € (3,486) | € (3,183) | € (3,449)
Floating-rate borrowings [member] | Increase in basis points [member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Increase/decrease in basis points | +45 | +45 | +45
Effect on profit before tax | € (51) | € (71) | € (90)
Floating-rate borrowings [member] | Decrease in basis points [member] |  |  |
Disclosure of credit risk exposure [line items] |  |  |
Increase/decrease in basis points | -45 | -45 | -45
Effect on profit before tax | € 51 | € 71 | € 78

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- Definition The basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Sensitivity analysis impact on profit or loss before tax. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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