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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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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% | 5.00%
Effect on profit before tax | € 1,707 | € 4,287 | € 5,381
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%) | (5.00%)
Effect on profit before tax | € (1,848) | € (4,798) | € (5,113)

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