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Employee benefits - Summary of Breakdown of Employee Benefits (Detail) - EUR (€) € in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of defined benefit plans [line items] |  |
Total employee benefits | € 30,100 | € 34,945
Italian leaving indemnities (TFR) |  |
Disclosure of defined benefit plans [line items] |  |
Total employee benefits | 9,563 | 10,224
Other leaving indemnities |  |
Disclosure of defined benefit plans [line items] |  |
Total employee benefits | 11,660 | 11,727
Post-employment benefits |  |
Disclosure of defined benefit plans [line items] |  |
Total employee benefits | 7,046 | 7,866
Other long-term employee benefits |  |
Disclosure of defined benefit plans [line items] |  |
Total employee benefits | 937 | 953
Termination benefits |  |
Disclosure of defined benefit plans [line items] |  |
Total employee benefits | 894 | 783
Total defined benefit obligations |  |
Disclosure of defined benefit plans [line items] |  |
Total employee benefits | 30,100 | 31,553
Other long-term payables to employees |  |
Disclosure of defined benefit plans [line items] |  |
Total employee benefits | € 0 | € 3,392

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