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Cost of Sales - Additional Information (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other manufacturing costs [member] | Cost of sales [member]      
Disclosure Of Cost Of Sales [line items]      
Depreciation and amortisation € 11,709 € 7,455 € 8,565