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Expenses by Nature - Summary of Depreciation and Amortization (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Depreciation And Amortization [Line Items]      
Total depreciation and amortisation € 20,177 € 20,065 € 22,924
Total depreciation and amortisation 8,356 7,895 10,144
Cost of sales [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 6,234 5,970 6,846
Amortisation of intangible assets 2 2 8
Government grants (1,414) (1,252) (1,192)
Total depreciation and amortisation 6,942 6,643 8,952
Cost of sales [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 2,120 1,923 3,290
Selling expenses [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Total depreciation and amortisation 11,832 11,819 12,441
Selling expenses [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 9,579 9,534 9,776
Selling expenses [member] | Property, plant and equipment [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 2,253 2,285 2,665
Administrative expenses [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Amortisation of intangible assets 1,029 1,088 899
Government grants (59) (54) (49)
Total depreciation and amortisation 1,403 1,603 1,531
Administrative expenses [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 135 249 310
Administrative expenses [member] | Property, plant and equipment [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation € 298 € 320 € 371