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Expenses by Nature - Summary of Depreciation and Amortization (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Depreciation And Amortization [Line Items]      
Total depreciation and amortisation € 19,733 € 20,724 € 20,177
Total depreciation and amortisation expense 6,526 8,639 8,356
Cost of sales [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 6,272 6,535 6,234
Amortisation of intangible assets 1 2 2
Government grants (1,388) (1,503) (1,414)
Total depreciation and amortisation 5,138 7,136 6,942
Cost of sales [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 253 2,102 2,120
Selling expenses [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Total depreciation and amortisation expense 12,450 12,369 11,832
Selling expenses [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 10,121 9,919 9,579
Selling expenses [member] | Property, plant and equipment [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 2,329 2,450 2,253
Administrative expenses [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Amortisation of intangible assets 1,568 1,039 1,029
Government grants (67) (145) (59)
Total depreciation and amortisation expense 2,145 1,219 1,403
Administrative expenses [member] | Right-of-use assets [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation 271   135
Administrative expenses [member] | Property, plant and equipment [member]      
Disclosure Of Depreciation And Amortization [Line Items]      
Depreciation € 373 € 325 € 298