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Income Tax Expense - Summary of Unrecognised Deferred Tax Assets (Detail) - EUR (€) € in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | € 424,128 | € 458,050
Unrecognised deferred tax assets, Tax effect | 100,735 | 110,729
Tax loss carry forwards [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 368,779 | 396,763
Unrecognised deferred tax assets, Tax effect | 88,328 | 97,107
Provision for contingent liabilities [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 12,231 | 14,311
Unrecognised deferred tax assets, Tax effect | 2,888 | 3,695
Inventory obsolescence [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 11,985 | 9,952
Unrecognised deferred tax assets, Tax effect | 2,560 | 2,480
Allowance for doubtful accounts [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 6,810 | 11,006
Unrecognised deferred tax assets, Tax effect | 1,540 | 2,547
Intercompany profit on inventory [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 5,676 | 5,958
Unrecognised deferred tax assets, Tax effect | 1,614 | 439
Provision for warranties [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 3,117 | 3,646
Unrecognised deferred tax assets, Tax effect | 898 | 1,051
Impairment of non-financial assets [Member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 3,989 | 3,318
Unrecognised deferred tax assets, Tax effect | 1,018 | 967
Goodwill and intangible assets [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 692 | 680
Unrecognised deferred tax assets, Tax effect | 48 | 196
IAS 19 adjustment—employees' leaving entitlement [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 1,807 | 1,806
Unrecognised deferred tax assets, Tax effect | 434 | 433
Deferred Costs [Member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 45 | 2,866
Unrecognised deferred tax assets, Tax effect | 9 | 822
Other temporary differences [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Unrecognised deferred tax assets, Gross Amount | 8,997 | 7,744
Unrecognised deferred tax assets, Tax effect | € 1,398 | € 992

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