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Trade Receivables - Additional Information (Detail) - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Disclosure of Trade receivables [line items] |  |  |
Trade receivables due from related parties | € 9,333 | € 1,407 | € 1,589
Total trade receivables | 40,967 | 37,549 | 40,138
Currency denominated, foreign currency [member] |  |  |
Disclosure of Trade receivables [line items] |  |  |
Total trade receivables | € 26,490 | € 16,991 | € 18,145

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