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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) before tax | € (15,072) | € 3,561 | € 8,774
Actual tax charge | 1,090 | 2,273 | 4,389
IRES (state tax) [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Expected tax benefit (expense) at statutory tax rates | 3,617 | (855) | (2,106)
Tax exempt income | 4,530 | 2,618 | 2,320
Aggregate effect of different tax rates in foreign jurisdictions | (481) | (79) | 191
Italian regional tax | (8) | (28) | (78)
Non-deductible expenses | (5,675) | (1,635) | (5,152)
Tax effect on unremitted earnings | 0 | (755) | (515)
Non taxable gain from disposal of a subsidiary | 0 | 0 | 1,057
Chinese withholding tax on income not recoverable | (1,100) | 0 | (699)
Effect of net change in deferred tax assets unrecognised | (1,973) | (1,539) | 593
Actual tax charge | (1,090) | (2,273) | (4,389)
Domestic [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) before tax | (12,078) | (7,448) | (1,551)
Foreign [member] |  |  |
Disclosure Of Income Taxes [line items] |  |  |
Profit / (loss) before tax | € (2,994) | € 11,009 | € 10,325

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