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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, 2023
Dec. 31, 2022
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance € 4,254 € 4,146
Ending balance 4,160 4,254
Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 49,365 48,273
Additions 951 1,174
Disposals (27,611) (120)
Impairment reversal   1
Effect of translation adjustments (9) 37
Ending balance 22,696 49,365
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (45,111) (44,127)
Amortisation (1,041) (1,031)
Disposals 27,611 86
Effect of translation adjustments 5 (39)
Ending balance (18,536) (45,111)
Trademark patents and other [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 380 381
Ending balance 396 380
Trademark patents and other [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 14,277 14,116
Additions 188 164
Disposals (11,098)  
Effect of translation adjustments (8) (3)
Ending balance 3,359 14,277
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 (13,897) (13,735)
Amortisation (168) (164)
Disposals 11,098 2
Effect of translation adjustments 4  
Ending balance (2,963) (13,897)
Software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 1,953 1,844
Ending balance 1,843 1,953
Software [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 33,167 32,236
Additions 763 1,010
Disposals (16,513) (120)
Impairment reversal   1
Effect of translation adjustments (1) 40
Ending balance 17,416 33,167
Software [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (31,214) (30,392)
Amortisation (873) (867)
Disposals 16,513 84
Effect of translation adjustments 1 (39)
Ending balance (15,573) (31,214)
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