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Intangibles Assets and Goodwill - Summary of Carrying Amount of Intangible Assets and Goodwill (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance € 4,160 € 4,254
Ending balance 6,628 4,160
Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 22,696 49,365
Additions 4,073 951
Disposals (8,144) (27,611)
Effect of translation adjustments 20 (9)
Ending balance 18,645 22,696
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (18,536) (45,111)
Amortisation (1,570) (1,041)
Disposals 8,102 27,611
Effect of translation adjustments (13) 5
Ending balance (12,017) (18,536)
Trademark patents and other [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 396 380
Ending balance 419 396
Trademark patents and other [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 3,359 14,277
Additions 220 188
Disposals (302) (11,098)
Effect of translation adjustments 4 (8)
Ending balance 3,281 3,359
Trademark patents and other [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (2,963) (13,897)
Amortisation (156) (168)
Disposals 260 11,098
Effect of translation adjustments (3) 4
Ending balance (2,862) (2,963)
Software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 1,843 1,953
Ending balance 4,288 1,843
Software [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 17,416 33,167
Additions 3,853 763
Disposals (7,842) (16,513)
Effect of translation adjustments 16 (1)
Ending balance 13,443 17,416
Software [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (15,573) (31,214)
Amortisation (1,414) (873)
Disposals 7,842 16,513
Effect of translation adjustments (10) 1
Ending balance (9,155) (15,573)
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 1,921 1,921
Ending balance 1,921 1,921
Goodwill [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 1,921 1,921
Ending balance € 1,921 € 1,921