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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, 2022
Dec. 31, 2021
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance € 4,146 € 3,757
Ending balance 4,254 4,146
Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 48,273 46,933
Additions 1,174 1,476
Disposals (120) (190)
Impairment reversal 1  
Effect of translation adjustments 37 54
Ending balance 49,365 48,273
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (44,127) (43,176)
Amortisation (1,031) (1,090)
Disposals 86 188
Effect of translation adjustments (39) (49)
Ending balance (45,111) (44,127)
Trademark patents and other [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 381 417
Ending balance 380 381
Trademark patents and other [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 14,116 14,022
Additions 164 100
Disposals   (22)
Effect of translation adjustments (3) 16
Ending balance 14,277 14,116
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 (13,735) (13,605)
Amortisation (164) (140)
Disposals 2 22
Effect of translation adjustments   (12)
Ending balance (13,897) (13,735)
Software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 1,844 1,419
Ending balance 1,953 1,844
Software [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 32,236 30,990
Additions 1,010 1,376
Disposals (120) (168)
Impairment reversal 1  
Effect of translation adjustments 40 38
Ending balance 33,167 32,236
Software [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (30,392) (29,571)
Amortisation (867) (950)
Disposals 84 166
Effect of translation adjustments (39) (37)
Ending balance (31,214) (30,392)
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