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Income Tax Expense - Summary of Unrecognised Deferred Tax Assets (Detail) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Deferred Tax Assets And Liabilities [line items] |  |
Total unrecognised deferred tax assets | € 114,057 | € 113,062
Tax loss carry forwards [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Total unrecognised deferred tax assets | 97,544 | 99,133
Provision for contingent liabilities [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Total unrecognised deferred tax assets | 5,839 | 3,234
Inventory obsolescence [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Total unrecognised deferred tax assets | 2,336 | 2,055
Allowance for doubtful accounts [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Total unrecognised deferred tax assets | 2,296 | 2,145
Intercompany profit on inventory [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Total unrecognised deferred tax assets | 1,643 | 1,040
Provision for warranties [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Total unrecognised deferred tax assets | 1,419 | 1,343
Impairment of property, plant and equipment [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Total unrecognised deferred tax assets | 984 | 1,228
Goodwill and intangible assets [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Total unrecognised deferred tax assets | 483 | 569
IAS 19 adjustment—employees' leaving entitlement [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Total unrecognised deferred tax assets | 389 | 470
Deferred Costs [Member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Total unrecognised deferred tax assets |  | 541
Other temporary differences [member] |  |
Deferred Tax Assets And Liabilities [line items] |  |
Total unrecognised deferred tax assets | € 1,124 | € 1,304

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