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Income Tax Expense - Summary of Unrecognised Deferred Tax Assets (Detail) - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Deferred Tax Assets And Liabilities [line items] |  |  |
Total unrecognised deferred tax assets | € 113,062 | € 111,459 | € 109,167
Tax loss carry forwards [member] |  |  |
Deferred Tax Assets And Liabilities [line items] |  |  |
Total unrecognised deferred tax assets | 99,133 | 95,912 | 94,556
Provision for contingent liabilities [member] |  |  |
Deferred Tax Assets And Liabilities [line items] |  |  |
Total unrecognised deferred tax assets | 3,234 | 4,085 | 2,223
Inventories obsolescence [member] |  |  |
Deferred Tax Assets And Liabilities [line items] |  |  |
Total unrecognised deferred tax assets | 2,055 | 1,924 | 2,078
Intercompany profit on inventory [member] |  |  |
Deferred Tax Assets And Liabilities [line items] |  |  |
Total unrecognised deferred tax assets | 1,040 | 817 | 947
Allowance for doubtful accounts [member] |  |  |
Deferred Tax Assets And Liabilities [line items] |  |  |
Total unrecognised deferred tax assets | 2,145 | 2,434 | 2,121
Provision for warranties [member] |  |  |
Deferred Tax Assets And Liabilities [line items] |  |  |
Total unrecognised deferred tax assets | 1,343 | 1,757 | 1,649
Impairment of property, plant and equipment [member] |  |  |
Deferred Tax Assets And Liabilities [line items] |  |  |
Total unrecognised deferred tax assets | 1,228 | 1,425 | 1,521
Goodwill and intangible assets [member] |  |  |
Deferred Tax Assets And Liabilities [line items] |  |  |
Total unrecognised deferred tax assets | 569 | 912 | 981
Deferred revenues and costs IFRS 15 [member] |  |  |
Deferred Tax Assets And Liabilities [line items] |  |  |
Total unrecognised deferred tax assets | 541 |  |
IAS 19 adjustment - employees' leaving entitlement [member] |  |  |
Deferred Tax Assets And Liabilities [line items] |  |  |
Total unrecognised deferred tax assets | 470 | 357 | 392
Other temporary differences [member] |  |  |
Deferred Tax Assets And Liabilities [line items] |  |  |
Total unrecognised deferred tax assets | € 1,304 | € 1,836 | € 2,699

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