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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
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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- Definition

The amount of current trade receivables. [Refer: Trade receivables]

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