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Income Tax Benefits / (Expenses) - Summary of Tax Losses Carried Forward (Detail) - EUR (€) € in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of Details of Tax Losses Carried Forward For Which No Deferred Tax Assets Were Recognized [line Items] |  |
Unused tax losses for which no deferred tax asset recognised | € 924,874 | € 787,747
Expiry within 5 years [member] |  |
Disclosure of Details of Tax Losses Carried Forward For Which No Deferred Tax Assets Were Recognized [line Items] |  |
Unused tax losses for which no deferred tax asset recognised | 57,616 | 76,457
Expiry over 5 years [member] |  |
Disclosure of Details of Tax Losses Carried Forward For Which No Deferred Tax Assets Were Recognized [line Items] |  |
Unused tax losses for which no deferred tax asset recognised | 154,293 | 141,342
No expiration [member] |  |
Disclosure of Details of Tax Losses Carried Forward For Which No Deferred Tax Assets Were Recognized [line Items] |  |
Unused tax losses for which no deferred tax asset recognised | € 712,965 | € 569,948

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