Property, plant and equipment, intangible assets and Right-of-use assets - Addtional information (Detail) - EUR (€) |
6 Months Ended | ||
|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Disclosure of detailed information about property, plant and equipment [line items] | |||
| Purchase of property, plant and equipment | € 1,200,000 | € 5,400,000 | |
| Unpaid investment decreased | 100,000 | € 500,000 | |
| Rental Land [Member] | |||
| Disclosure of detailed information about property, plant and equipment [line items] | |||
| Addition to right-of-use assets | 0 | 3,200,000 | |
| Office Equipment And Installations [Member] | |||
| Disclosure of detailed information about property, plant and equipment [line items] | |||
| Leasehold improvements | € 600,000 | € 4,100,000 | |