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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, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Financial assets	€ 95,430	€ 81,373
Financial liabilities	203,616	191,246
Chinese Yuan [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	21,047	20,592
Financial liabilities	15,999	12,071
Net Exposure	5,048	8,521
U.S. dollars [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	26,464	15,524
Financial liabilities	35,295	26,995
Net Exposure	(8,831)	(11,471)
British pounds [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	13,110	5,984
Financial liabilities	16,845	12,482
Net Exposure	(3,735)	(6,498)
Brazilian Reais [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	3,753	5,975
Financial liabilities	2,173	2,012
Net Exposure	1,580	3,963
Canadian dollars [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,693	3,758
Financial liabilities	88	124
Net Exposure	1,605	3,634
Mexican pesos [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	797	984
Financial liabilities	1,166	910
Net Exposure	(369)	74
Romanian Leu [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	901	528
Financial liabilities	7,090	6,673
Net Exposure	(6,189)	(6,145)
Other [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	3,115	2,493
Financial liabilities	4,574	3,895
Net Exposure	(1,459)	(1,402)
Total currencies [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	70,880	55,838
Financial liabilities	83,230	65,162
Net Exposure	€ (12,350)	€ (9,324)

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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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