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Share Capital, Reserves and Retained Earnings - Summary of net debt to equity ratio (Detail) € in Thousands | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€) | Jan. 01, 2017 EUR (€)
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Disclosure Of Net Debt To Equity Ratio [Abstract] |  |  |  |
Total liabilities | € 264,576 | € 234,527 |  |
Less: cash and cash equivalents | (39,799) | (62,131) |  |
Net debt (a) | 224,777 | 172,396 |  |
Total equity (b) | € 104,818 | € 138,181 | € 104,534 | € 143,999
Net debt to equity ratio (a/b) | 2.14 | 1.25 |  |

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