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Cost of Sales - Additional Information (Detail) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Cost Of Sales [line items] |  |
Depreciation and amortisation | € 10,003 | € 11,362
Other manufacturing costs [member] | Cost of sales [member] |  |
Disclosure Of Cost Of Sales [line items] |  |
Depreciation and amortisation | € 7,489 | € 8,638

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