Financial Assets and Liabilities - Movements in Level 3 Fair Value Measurements (Detail) - EUR (€) € in Thousands |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Reconciliation of changes in fair value measurement, liabilities [abstract] | ||
| Beginning balance | € 256,231 | |
| Ending balance | 0 | |
| Level 3 [member] | ||
| Reconciliation of changes in fair value measurement, liabilities [abstract] | ||
| Beginning balance | 256,231 | € 150,670 |
| Remeasurement recognized in finance (income) or expense | 25,938 | 35,909 |
| Reclassified to equity upon conversion to ordinary shares | (282,169) | 0 |
| Ending balance | € 0 | € 186,579 |