Tax-related balances - Additional Information (Detail) - EUR (€) € in Thousands |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Dec. 31, 2025 |
|
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||
| Unrecognized tax losses | € 287,863 | € 266,077 |
| Wallbox USA [Member] | ||
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||
| Unrecognized tax losses | 71,037 | 76,587 |
| Albert Buettner GmbH [Member] | ||
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||
| Unrecognized tax losses | 21,917 | 21,399 |
| Other Subsidiaries [Member] | ||
| Disclosure of temporary difference, unused tax losses and unused tax credits [line items] | ||
| Unrecognized tax losses | € 20,538 | € 20,169 |