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Expenses by Nature - Summary of Depreciation and Amortization (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Depreciation And Amortization [line items]    
Depreciation € 10,154 € 10,861
Amortisation 910 1,569
Government grants (1,061) (1,068)
Total depreciation and amortization 10,003 11,362
Total depreciation and amortization 10,003 11,361
Cost of sales [member]    
Disclosure Of Depreciation And Amortization [line items]    
Depreciation 7,455 8,564
Amortisation 34 74
Government grants (1,061) (1,068)
Total depreciation and amortization 6,428 7,570
Selling expenses [member]    
Disclosure Of Depreciation And Amortization [line items]    
Depreciation 2,274 1,818
Amortisation   306
Total depreciation and amortization 2,274 2,124
Administrative expenses [member]    
Disclosure Of Depreciation And Amortization [line items]    
Depreciation 425 478
Amortisation 876 1,190
Total depreciation and amortization € 1,301 € 1,668