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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) - EUR (€)
€ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of credit risk exposure [line items]        
Increase/decrease in basis points Euribor 3M      
Increase in basis points [member] | Market risk [member]        
Disclosure of credit risk exposure [line items]        
Effect on profit before tax   € 2,150 € 1,707 € 4,287
Decrease in basis points [member] | Market risk [member]        
Disclosure of credit risk exposure [line items]        
Effect on profit before tax   € (2,403) € (1,848) € (4,798)
Floating-rate borrowings [member] | Increase in basis points [member] | Market risk [member]        
Disclosure of credit risk exposure [line items]        
Increase/decrease in basis points   +45 +45 +45
Effect on profit before tax   € (40) € (40) € (52)
Floating-rate borrowings [member] | Decrease in basis points [member] | Market risk [member]        
Disclosure of credit risk exposure [line items]        
Increase/decrease in basis points   -45 -45 -45
Effect on profit before tax   € 40 € 40 € 52