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Trade Receivables - Summary of Trade Receivables Denominated in Foreign Currencies (Detail) - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Trade receivables | € 40,967 | € 37,549 | € 40,138
Chinese Yuan [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Trade receivables | 7,233 | 618 | 374
Brazil Real [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Trade receivables | 5,893 | 4,620 | 4,461
British pounds [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Trade receivables | 2,823 | 3,215 | 5,298
U.S. dollars [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Trade receivables | 2,183 | 3,736 | 5,694
Canadian dollars [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Trade receivables | 2,124 | 2,232 | 466
Other currencies [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Trade receivables | 6,234 | 2,570 | 1,852
Currency denominated, foreign currency [member] |  |  |
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items] |  |  |
Trade receivables | € 26,490 | € 16,991 | € 18,145

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