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Derivative Financial Instruments - Summary of Information Regarding the Contract Amount in Estimated Fair Value of All of the Group's Forward Exchange Contacts (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Derivative Financial Instruments [line items]
Contract amount	€ 26,255	€ 40,366
Unrealised gains (losses)	(141)	(627)
Financial liabilities at fair value, class [member]
Disclosure Of Derivative Financial Instruments [line items]
Contract amount	13,668	29,947
Unrealised gains (losses)	(253)	(772)
Financial assets at fair value, class [member]
Disclosure Of Derivative Financial Instruments [line items]
Contract amount	12,587	10,419
Unrealised gains (losses)	€ 112	€ 145

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- Definition

The gains (losses) recognised in other comprehensive income on change in value of forward elements of forward contracts, net of tax. [Refer: Other comprehensive income]

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- Definition

The gains (losses) recognised in profit or loss for assets measured at fair value that are attributable to the change in unrealised gains or losses relating to those assets held at the end of the reporting period. [Refer: At fair value [member]]

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Disclosure Of Derivative Financial Instruments [line items]

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