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Expenses by Nature - Summary of Depreciation and Amortization (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Depreciation And Amortization [Line Items]      
Total depreciation and amortization € 22,924 € 23,487 € 10,003
Cost of sales [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 6,846 7,867 7,455
Amortisation of intangible assets 8 14 34
Government grants (1,192) (1,463) (1,061)
Total depreciation and amortization 8,952 10,260 6,428
Cost of sales [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 3,290 3,842  
Selling expenses [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 9,776 9,084  
Total depreciation and amortization 12,441 11,805 2,274
Selling expenses [member] | Property, plant and equipment [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 2,665 2,721 2,274
Administrative expenses [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Amortisation of intangible assets 899 903 876
Government grants (49) (163)  
Total depreciation and amortization 1,531 1,422 1,301
Administrative expenses [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 310 301  
Administrative expenses [member] | Property, plant and equipment [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation € 371 € 381 € 425