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Financial Instruments - Fair Values and Risk Management - Summary of Sensitivity to Reasonably Possible Change in Foreign Exchange Rates and Impact on Profit Before Tax (Detail) - Market risk [member] - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Increase in basis points [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in foreign exchange rates | 5.00% | 5.00%
Effect on profit before tax | € 2,776 | € 3,023
Decrease in basis points [member] |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Change in foreign exchange rates | (5.00%) | (5.00%)
Effect on profit before tax | € (3,183) | € (3,449)

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