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Income Tax Expense - Summary of Unrecognised Deferred Tax Assets (Detail) - EUR (€) € in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | € 409,482 | € 424,128
Unrecognised deferred tax assets, Tax effect | 101,604 | 100,735
Tax loss carry forwards [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 366,175 | 368,779
Unrecognised deferred tax assets, Tax effect | 90,713 | 88,328
Provision for contingent liabilities [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 7,673 | 12,231
Unrecognised deferred tax assets, Tax effect | 2,207 | 2,888
Inventory obsolescence [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 8,266 | 11,985
Unrecognised deferred tax assets, Tax effect | 2,327 | 2,560
Allowance for doubtful accounts [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 5,125 | 6,810
Unrecognised deferred tax assets, Tax effect | 1,230 | 1,540
Intercompany profit on inventory [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 4,716 | 5,676
Unrecognised deferred tax assets, Tax effect | 1,359 | 1,614
Provision for warranties [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 3,375 | 3,117
Unrecognised deferred tax assets, Tax effect | 973 | 898
Impairment of non-financial assets [Member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 3,284 | 3,989
Unrecognised deferred tax assets, Tax effect | 870 | 1,018
IAS 19 adjustment - employees' leaving entitlement [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount |  | 1,807
Unrecognised deferred tax assets, Tax effect |  | 434
Other temporary differences [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 10,868 | 9,734
Unrecognised deferred tax assets, Tax effect | € 1,925 | € 1,455

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