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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, 2021 | Dec. 31, 2020
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 368,780 | € 396,763
Not More than Five Years [Member] |  |
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 6,207 | € 7,421
Expiration Date | 2022-2026 | 2021-2025
More than Five Years [Member] |  |
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 3,257 | € 4,902
Expiration Date | 2026 | 2025
No expiration [member] |  |
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 359,316 | € 384,440

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