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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, 2021
Dec. 31, 2020
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance € 3,757 € 6,021
Ending balance 4,146 3,757
Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 46,933 48,625
Additions 1,476 792
Impairment of goodwill   (1,866)
Disposals (190)  
Reclassifications to assets held for sale   (227)
Effect of translation adjustments 54 (391)
Ending balance 48,273 46,933
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (43,176) (42,604)
Amortisation (1,090) (907)
Disposals 188  
Reclassifications to assets held for sale   218
Effect of translation adjustments (49) 117
Ending balance (44,127) (43,176)
Trademark patents and other [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 417 452
Ending balance 381 417
Trademark patents and other [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 14,022 14,086
Additions 100 107
Disposals (22)  
Reclassifications to assets held for sale   (174)
Effect of translation adjustments 16 3
Ending balance 14,116 14,022
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 (13,605) (13,634)
Amortisation (140) (145)
Disposals 22  
Reclassifications to assets held for sale   167
Effect of translation adjustments (12) 7
Ending balance (13,735) (13,605)
Software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 1,419 1,501
Ending balance 1,844 1,419
Software [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 30,990 30,471
Additions 1,376 685
Disposals (168)  
Reclassifications to assets held for sale   (53)
Effect of translation adjustments 38 (113)
Ending balance 32,236 30,990
Software [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (29,571) (28,970)
Amortisation (950) (762)
Disposals 166  
Reclassifications to assets held for sale   51
Effect of translation adjustments (37) 110
Ending balance (30,392) (29,571)
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 1,921 4,068
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 4,068
Impairment of goodwill   (1,866)
Effect of translation adjustments   (281)
Ending balance € 1,921 € 1,921