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Income Tax Expense - Summary of Unrecognised Deferred Tax Assets (Detail) - EUR (€) € in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | € 415,012 | € 409,482
Unrecognised deferred tax assets, Tax effect | 102,135 | 101,604
Tax loss carry forwards [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 367,620 | 366,175
Unrecognised deferred tax assets, Tax effect | 90,025 | 90,713
Provision for contingent liabilities [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 6,588 | 7,673
Unrecognised deferred tax assets, Tax effect | 1,893 | 2,207
Inventory obsolescence [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 7,803 | 8,266
Unrecognised deferred tax assets, Tax effect | 2,197 | 2,327
Allowance for doubtful accounts [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 3,744 | 5,125
Unrecognised deferred tax assets, Tax effect | 899 | 1,230
Intercompany profit on inventory [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 7,890 | 4,716
Unrecognised deferred tax assets, Tax effect | 2,274 | 1,359
Provision for warranties [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 2,613 | 3,375
Unrecognised deferred tax assets, Tax effect | 753 | 973
Impairment of non-financial assets [Member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 2,613 | 3,284
Unrecognised deferred tax assets, Tax effect | 591 | 870
Other temporary differences [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 16,141 | 10,868
Unrecognised deferred tax assets, Tax effect | € 3,503 | € 1,925

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