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Expenses by Nature - Summary of Depreciation and Amortization (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Depreciation And Amortization [Line Items]      
Total depreciation and amortisation € 20,065 € 22,924 € 23,487
Total depreciation and amortisation 7,895 10,144 11,709
Cost of sales [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 5,970 6,846 7,867
Amortisation of intangible assets 2 8 14
Government grants (1,252) (1,192) (1,463)
Total depreciation and amortisation 6,643 8,952 10,260
Cost of sales [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 1,923 3,290 3,842
Selling expenses [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Total depreciation and amortisation 11,819 12,441 11,805
Selling expenses [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 9,534 9,776 9,084
Selling expenses [member] | Property, plant and equipment [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 2,285 2,665 2,721
Administrative expenses [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Amortisation of intangible assets 1,088 899 903
Government grants (54) (49) (163)
Total depreciation and amortisation 1,603 1,531 1,422
Administrative expenses [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 249 310 301
Administrative expenses [member] | Property, plant and equipment [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation € 320 € 371 € 381