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Expenses by Nature - Summary of Depreciation and Amortization (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure Of Depreciation And Amortization [Line Items]      
Total depreciation and amortisation € 20,724 € 20,177 € 20,065
Total depreciation and amortisation 8,639 8,356 7,895
Cost of sales [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 6,535 6,234 5,970
Amortisation of intangible assets 2 2 2
Government grants (1,503) (1,414) (1,252)
Total depreciation and amortisation 7,136 6,942 6,643
Cost of sales [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 2,102 2,120 1,923
Selling expenses [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Total depreciation and amortisation 12,369 11,832 11,819
Selling expenses [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 9,919 9,579 9,534
Selling expenses [member] | Property, plant and equipment [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 2,450 2,253 2,285
Administrative expenses [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Amortisation of intangible assets 1,039 1,029 1,088
Government grants (145) (59) (54)
Total depreciation and amortisation 1,219 1,403 1,603
Administrative expenses [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation   135 249
Administrative expenses [member] | Property, plant and equipment [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation € 325 € 298 € 320