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Income Tax Expense - Summary of Unrecognised Deferred Tax Assets (Detail) - EUR (€) € in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | € 427,829 | € 415,012
Unrecognised deferred tax assets, Tax effect | 104,973 | 102,135
Tax loss carry forwards [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 378,307 | 367,620
Unrecognised deferred tax assets, Tax effect | 93,266 | 90,025
Provision for contingent liabilities [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 4,892 | 6,588
Unrecognised deferred tax assets, Tax effect | 1,396 | 1,893
Inventory obsolescence [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 10,989 | 7,803
Unrecognised deferred tax assets, Tax effect | 2,272 | 2,197
Allowance for doubtful accounts [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 3,218 | 3,744
Unrecognised deferred tax assets, Tax effect | 772 | 899
Intercompany profit on inventory [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 7,644 | 7,890
Unrecognised deferred tax assets, Tax effect | 2,203 | 2,274
Provision for warranties [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 1,929 | 2,613
Unrecognised deferred tax assets, Tax effect | 556 | 753
Impairment of non-financial assets [Member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 3,051 | 2,613
Unrecognised deferred tax assets, Tax effect | 587 | 591
Other temporary differences [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 17,799 | 16,141
Unrecognised deferred tax assets, Tax effect | € 3,921 | € 3,503

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