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Income Tax Expense - Summary of Tax Loss Carry Forward (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 380,522 | € 367,620
Not More than Five Years [Member] |  |
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 7,720 | € 4,582
Expiration Date | 2025-2029 | 2024-2028
More than Five Years [Member] |  |
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 127 | € 378
Expiration Date | 2029 | 2028
No expiration [member] |  |
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 372,675 | € 362,660

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