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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, 2023 | Dec. 31, 2022
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 367,620 | € 366,175
Not More than Five Years [Member] |  |
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 4,582 | € 5,132
Expiration Date | 2024-2028 | 2023-2027
More than Five Years [Member] |  |
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 378 | € 347
Expiration Date | 2028 | 2027
No expiration [member] |  |
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 362,660 | € 360,696

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