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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, 2020
Dec. 31, 2019
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance € 6,021 € 5,892
Ending balance 3,757 6,021
Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 48,625 47,585
Additions 792 913
Impairment of goodwill (1,866)  
Reclassifications to assets held for sale (227)  
Effect of translation adjustments (391) 127
Ending balance 46,933 48,625
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (42,604) (41,693)
Amortisation (907) (917)
Reclassifications to assets held for sale 218  
Effect of translation adjustments 117 6
Ending balance (43,176) (42,604)
Trademark patents and other [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 452 312
Ending balance 417 452
Trademark patents and other [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 14,086 14,021
Additions 107 66
Reclassifications to assets held for sale (174)  
Effect of translation adjustments 3 (1)
Ending balance 14,022 14,086
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 (13,634) (13,709)
Amortisation (145) (150)
Reclassifications to assets held for sale 167  
Effect of translation adjustments 7 225
Ending balance (13,605) (13,634)
Software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 1,501 1,633
Ending balance 1,419 1,501
Software [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 30,471 29,617
Additions 685 847
Reclassifications to assets held for sale (53)  
Effect of translation adjustments (113) 7
Ending balance 30,990 30,471
Software [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (28,970) (27,984)
Amortisation (762) (767)
Reclassifications to assets held for sale 51  
Effect of translation adjustments 110 (219)
Ending balance (29,571) (28,970)
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 4,068 3,947
Ending balance 1,921 4,068
Goodwill [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 4,068 3,947
Impairment of goodwill (1,866)  
Effect of translation adjustments (281) 121
Ending balance € 1,921 € 4,068