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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, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance € 5,837 € 3,927
Ending balance 5,892 5,837
Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 46,668 43,323
Additions 880 3,280
Disposals (45) (8)
Effect of traslation adj. 82 73
Ending balance 47,585 46,668
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (40,831) (39,396)
Amortisation (910) (1,569)
Disposals 43 8
Effect of traslation adj. 4 126
Ending balance (41,693) (40,831)
Trademark patents and other [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 317 565
Ending balance 312 317
Trademark patents and other [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 13,896 13,715
Additions 169  
Disposals (3) (8)
Effect of traslation adj. (41) 189
Ending balance 14,021 13,896
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 (13,579) (13,150)
Amortisation (158) (563)
Disposals 1 8
Effect of traslation adj. 27 126
Ending balance (13,709) (13,579)
Software [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 1,674 1,441
Ending balance 1,633 1,674
Software [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 28,926 27,687
Additions 711 1,239
Disposals (42)  
Effect of traslation adj. 22  
Ending balance 29,617 28,926
Software [member] | Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance (27,252) (26,246)
Amortisation (752) (1,006)
Disposals 42  
Effect of traslation adj. (22)  
Ending balance (27,984) (27,252)
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 3,846 1,921
Ending balance 3,947 3,846
Goodwill [member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Beginning balance 3,846 1,921
Additions   2,041
Effect of traslation adj. 101 (116)
Ending balance € 3,947 € 3,846