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Intangibles Assets and Goodwill - Summary of Carrying Amount of Intangible Assets, Goodwill and Accumulated Depreciation (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance € 5,892 € 5,837
Ending balance 6,021 5,892
Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 47,585 46,668
Additions 913 880
Disposals   (45)
Effect of translation adjustments 127 82
Ending balance 48,625 47,585
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (41,693) (40,831)
Amortisation (917) (910)
Disposals   43
Effect of translation adjustments 6 5
Ending balance (42,604) (41,693)
Trademark patents and other [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 312 317
Ending balance 452 312
Trademark patents and other [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 14,021 13,896
Additions 66 169
Disposals   (3)
Effect of translation adjustments (1) (41)
Ending balance 14,086 14,021
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 (13,709) (13,579)
Amortisation (150) (158)
Disposals   1
Effect of translation adjustments 225 27
Ending balance (13,634) (13,709)
Software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 1,633 1,674
Ending balance 1,501 1,633
Software [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 29,617 28,926
Additions 847 711
Disposals   (42)
Effect of translation adjustments 7 22
Ending balance 30,471 29,617
Software [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (27,984) (27,252)
Amortisation (767) (752)
Disposals   42
Effect of translation adjustments (219) (22)
Ending balance (28,970) (27,984)
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 3,947 3,846
Ending balance 4,068 3,947
Goodwill [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 3,947 3,846
Effect of translation adjustments 121 101
Ending balance € 4,068 € 3,947