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Income Tax Expense - Additional Information (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income tax [line items]
Effective income tax rates	21.11%	7.45%	18.32%
Liabilities for current income tax	€ 1,134	€ 1,283
Current income tax receivable	1,255	1,082
Deferred tax assets	€ 2,023	1,974
Maximum percentage of permitted tax loss carry forwards can be utilized to off set	80.00%
Tax on unremitted earnings of subsidiaries [member]
Income tax [line items]
Tax effect of unremitted earnings	€ 507	€ 2,626
IRAP [member]
Income tax [line items]
Applicable tax rate	4.82%	4.82%	4.82%
Increase in applicable tax rate	0.92%
Current tax rate	3.90%
IRES [member]
Income tax [line items]
Applicable tax rate	24.00%	24.00%	24.00%
Tax effect of unremitted earnings	€ (1,024)	€ (430)	€ (1,252)

X

- Definition

The applicable income tax rate.

+ References

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X

- Definition

The tax expense (income) divided by the accounting profit. [Refer: Accounting profit]

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- Definition

The current amount of current tax assets. [Refer: Current tax assets]

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- Definition

The current amount of current tax liabilities. [Refer: Current tax liabilities]

+ References

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- Definition

The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities]

+ References

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Current tax rate.

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Income tax [line items]

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- Definition

Increase decrease in applicable tax rate.

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- Definition

Maximum percentage of permitted tax loss carry forwards can be utilized to off set

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- Definition

Tax effect of unremitted earnings.

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