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Income Tax Expense - Additional Information (Detail) - EUR (€) € in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income tax [line items] |  |  |  |
Effective income tax rates |  | 18.32% | 10.32% |
Income tax payable |  | € 880 | € 1,317 |
Current income tax receivable | € 1,254 | € 1,986 | 2,413 |
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 | € 5,603 | € 1,708 | € 3,812 |
IRAP [member] |  |  |  |
Income tax [line items] |  |  |  |
Applicable tax rate |  | 4.82% | 4.82% |
Increase in applicable tax rate |  | 0.92% |  |
IRES [member] |  |  |  |
Income tax [line items] |  |  |  |
Applicable tax rate |  | 24.00% | 24.00% | 27.50%
Tax effect of unremitted earnings |  | € (1,252) | € (1,998) |

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