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Financial Instruments - Fair Values and Risk Management - Summary Of Quantitative Information About Exposure To Currency Risk (Detail) - EUR (€) € in Thousands	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]
Financial assets	€ 81,373	€ 117,356
Financial liabilities	191,246	161,226
Chinese Yuan [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	20,592	27,101
Financial liabilities	12,071	9,726
Net Exposure	8,521	17,375
U.S. dollars [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	15,524	19,661
Financial liabilities	26,995	8,841
Net Exposure	(11,471)	10,820
British pounds [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	5,984	8,696
Financial liabilities	12,482	2,482
Net Exposure	(6,498)	6,214
Brazilian Reais [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	5,975	6,211
Financial liabilities	2,012	2,250
Net Exposure	3,963	3,961
Canadian dollars [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	3,758	3,696
Financial liabilities	124	236
Net Exposure	3,634	3,460
Mexican pesos [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	984	3,344
Financial liabilities	910	43
Net Exposure	74	3,301
Romanian Leu [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	528	886
Financial liabilities	6,673	4,976
Net Exposure	(6,145)	(4,090)
Other [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,493	6,308
Financial liabilities	3,895	855
Net Exposure	(1,402)	5,453
Total currencies [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	55,838	75,903
Financial liabilities	65,162	29,409
Net Exposure	€ (9,324)	€ 46,494

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The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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