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Right-of-use-assets - Summary of Changes in Carrying Amount of Right-of-use Assets (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]    
Balance € 54,718 € 55,798
Depreciation (13,376) (13,227)
Balance 49,013 54,718
Right-of-use assets [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance 67,904 55,798
Additions 10,083 11,181
Disposals (6,910)  
Adjustments due to remeasurements 693  
Adjustments due to modifications (327)  
Effect of translation adjustments (2,710) 925
Balance 68,733 67,904
Accumulated Depreciation and Impairment Loss [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Accumulated depreciation and impairment loss (13,186)  
Depreciation (13,376) (13,227)
Disposals 6,639  
Impairment loss (584)  
Adjustments due to remeasurements 157  
Effect of translation adjustments 630 41
Accumulated depreciation and impairment loss (19,720) (13,186)
Buildings [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance 53,983 55,159
Balance 48,593 53,983
Buildings [member] | Right-of-use assets [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance 66,867 55,159
Additions 10,083 10,786
Disposals (6,910)  
Adjustments due to remeasurements 693  
Adjustments due to modifications (327)  
Effect of translation adjustments (2,696) 922
Balance 67,710 66,867
Buildings [member] | Accumulated Depreciation and Impairment Loss [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Accumulated depreciation and impairment loss (12,884)  
Depreciation (13,066) (12,926)
Disposals 6,639  
Impairment loss (584)  
Adjustments due to remeasurements 157  
Effect of translation adjustments 621 42
Accumulated depreciation and impairment loss (19,117) (12,884)
Vehicles [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance 735 639
Balance 420 735
Vehicles [member] | Right-of-use assets [member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Balance 1,037 639
Additions   395
Effect of translation adjustments (14) 3
Balance 1,023 1,037
Vehicles [member] | Accumulated Depreciation and Impairment Loss [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Accumulated depreciation and impairment loss (302)  
Depreciation (310) (301)
Effect of translation adjustments 9 (1)
Accumulated depreciation and impairment loss € (603) € (302)