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Income Tax Expense - Summary of Net Profit (Loss) Before Income Taxes and Non-controlling Interest (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) for the year | € 40,548 | € (27,959) | [1]
Actual tax charge | 7,429 | 2,886 | [1]
IRES [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Expected tax benefit (expense) at statutory tax rates | (9,732) | 6,710 |
Tax exempt income | 1,665 | 952 |
Aggregate effect of different tax rates in foreign jurisdictions | 208 | 25 |
Italian regional tax | (46) | (39) |
Non-deductible expenses | (2,667) | (1,972) |
Tax effect on unremitted earnings | (1,252) | (1,998) |
Non taxable gain from disposal and loss of control of a subsidiary | 17,193 |  |
Chinese withholding tax on income not recoverable | (4,458) |  |
Tax audit settlement for other taxes |  | 930 |
Effect of net change in deferred tax assets unrecognised | (8,340) | (7,494) |
Actual tax charge | (7,429) | (2,886) |
Domestic [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) for the year | 40,822 | (28,358) |
Foreign [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) for the year | € (274) | € 399 |
[1] | The Group has initially applied IFRS 9 as at January 1, 2018. Under the transition method chosen, comparative information has not been restated except for separately presenting impairment losses on trade receivables. See note 5.

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