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Income Tax Expense - Additional Information (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income tax [line items]
Effective income tax rates	7.45%	18.32%	10.32%
Income tax payable	€ 1,283	€ 880
Current income tax receivable	€ 1,082	1,986
Maximum percentage of permitted tax loss carry forwards can be utilized to off set	80.00%
Deferred tax assets	€ 1,974	2,027
Tax on unremitted earnings of subsidiaries [member]
Income tax [line items]
Tax effect of unremitted earnings	€ 2,626	€ 2,901
IRAP [member]
Income tax [line items]
Applicable tax rate	4.82%	4.82%	4.82%
Increase in applicable tax rate	0.92%
IRES [member]
Income tax [line items]
Applicable tax rate	24.00%	24.00%	24.00%	27.50%
Tax effect of unremitted earnings	€ (430)	€ (1,252)	€ (1,998)

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

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

+ References

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X

- Definition

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

+ References

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X

- 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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X

- Definition

Income tax debt

+ References

No definition available.

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- Definition

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.

+ References

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- Details

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