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Trade Receivables - Additional Information (Detail) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of Trade receivables [line items] |  |  |
Total trade receivables | € 29,187 | € 40,967 | € 37,549
Trade receivables due from related parties | 5,235 | 9,333 |
Currency denominated, foreign currency [member] |  |  |
Disclosure of Trade receivables [line items] |  |  |
Total trade receivables | € 19,807 | € 26,490 |

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