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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
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Increase in basis points [member]      
Disclosure of credit risk exposure [line items]      
Effect on profit before tax € 1,707 € 4,287 € 5,381
Decrease in basis points [member]      
Disclosure of credit risk exposure [line items]      
Effect on profit before tax € (1,848) € (4,798) € (5,113)
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 € (40) € (52) € (43)
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 € 40 € 52 € 43