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Share Capital, Reserves and Retained Earnings - Summary of net debt to equity ratio (Detail) € in Thousands | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€)
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Disclosure Of Net Debt To Equity Ratio [Abstract] |  |  |  |
Total liabilities | € 306,186 | € 280,636 |  |
Less cash and cash equivalents | (53,472) | (48,187) |  |
Net debt (a) | 252,714 | 232,449 |  |
Total equity (b) | € 83,846 | € 75,364 | € 104,818 | € 138,181
Net debt to equity ratio | 3.01 | 3.08 |  |

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