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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Impact of IFRS Adjustments for Unrecognised Deferred Tax Assets (Detail) - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Total unrecognised deferred tax assets | € 113,062 | € 111,459 | € 109,167
IAS 19 adjustment - employees' leaving entitlement [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Total unrecognised deferred tax assets | € 470 | 357 | 392
Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Total unrecognised deferred tax assets |  | 1,865 | 2,410
Effect of transition to IFRSs [member] | Revenue of finished goods derecognized [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Total unrecognised deferred tax assets |  | 881 | 1,258
Effect of transition to IFRSs [member] | Government Grants [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Total unrecognised deferred tax assets |  | 403 | 476
Effect of transition to IFRSs [member] | IAS 19 adjustment - employees' leaving entitlement [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Total unrecognised deferred tax assets |  | 357 | 392
Effect of transition to IFRSs [member] | Costs not eligible for capitalization included in property, plant and equipment [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Total unrecognised deferred tax assets |  | 95 | 115
Effect of transition to IFRSs [member] | Costs not eligible for capitalization included in intangible assets [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Total unrecognised deferred tax assets |  |  | 88
Effect of transition to IFRSs [member] | Deferred revenues and costs for Service Type Warranty [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Total unrecognised deferred tax assets |  | € 129 | € 81

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