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Qualitative and quantitative information on financial risks - Additional Information (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Foreign currency risk    
Disclosure of financial assets that are either past due or impaired [line items]    
Potential effects of a shock change on the main currencies, as a percent 5.00%  
Interest rate risk    
Disclosure of financial assets that are either past due or impaired [line items]    
Percentage of increase in short-term interest rates on such floating rate non-current financial liabilities 20.00%  
Impact on increase in profit before tax of sensitivity on floating rate borrowings € 5,200 € 10,092
Percentage of decrease in short-term interest rates on such floating rate non-current financial liabilities 20.00%  
Impact on decrease in profit before tax of sensitivity on floating rate borrowings € 3,920 7,288
Interest rate risk | Interest rate swaps | At fair value    
Disclosure of financial assets that are either past due or impaired [line items]    
(Negative) positive fair value held for hedging (199) (324)
Interest rate risk | Interest rate swaps | Financial Instruments Held For Hedging    
Disclosure of financial assets that are either past due or impaired [line items]    
Notional amount € 81,295 € 82,631
Bottom of range | Foreign currency risk    
Disclosure of financial assets that are either past due or impaired [line items]    
Percentage of hedges arrange to forecast sales in foreign currencies 50.00%  
Top of range | Foreign currency risk    
Disclosure of financial assets that are either past due or impaired [line items]    
Percentage of hedges arrange to forecast sales in foreign currencies 60.00%