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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]      
Balance € 49,013 € 54,718  
Depreciation (11,706) (13,376) € (13,227)
Balance 50,755 49,013 54,718
Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance 68,733 67,904  
Additions 3,194 10,083  
Disposals (1,267) (6,910)  
Adjustments due to remeasurements 9,084 693  
Adjustments due to modifications 41 (327)  
Effect of translation adjustments 3,034 (2,710)  
Balance 82,819 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 (19,720) (13,186)  
Depreciation (11,706) (13,376)  
Disposals 1,209 6,639  
Impairment loss (1,188) (584)  
Adjustments due to remeasurements   157  
Effect of translation adjustments (659) 630  
Accumulated depreciation and impairment loss (32,064) (19,720) (13,186)
Buildings [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance 48,593 53,983  
Balance 50,583 48,593 53,983
Buildings [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance 67,710 66,867  
Additions 3,194 10,083  
Disposals (1,267) (6,910)  
Adjustments due to remeasurements 9,084 693  
Adjustments due to modifications 42 (327)  
Effect of translation adjustments 3,021 (2,696)  
Balance 81,784 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 (19,117) (12,884)  
Depreciation (11,457) (13,066)  
Disposals 1,209 6,639  
Impairment loss (1,188) (584)  
Adjustments due to remeasurements   157  
Effect of translation adjustments (648) 621  
Accumulated depreciation and impairment loss (31,201) (19,117) (12,884)
Vehicles [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance 420 735  
Balance 172 420 735
Vehicles [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Balance 1,023 1,037  
Adjustments due to modifications (1)    
Effect of translation adjustments 13 (14)  
Balance 1,035 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 (603) (302)  
Depreciation (249) (310)  
Effect of translation adjustments (11) 9  
Accumulated depreciation and impairment loss € (863) € (603) € (302)