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Right-of-use-assets - Summary of Information about leases right-of-use-assets (Detail)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
EUR (€)
Disclosure of quantitative information about right-of-use assets [line items]  
Balance as at January 1, 2019 € 55,798
Balance as at December 31, 2019 54,718
Disclosure Of Depreciation And Amortisation Expense [Abstract]  
Depreciation (13,227)
Balance as at January 1, 2019 55,798
Balance as at December 31, 2019 54,718
Accumulated Depreciation [Member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Effect of translation adjustments 41
Disclosure Of Depreciation And Amortisation Expense [Abstract]  
Effect of translation adjustments 41
Accumulated depreciation as at December 31, 2019 (13,186)
Buildings [member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Balance as at January 1, 2019 55,159
Balance as at December 31, 2019 53,983
Disclosure Of Depreciation And Amortisation Expense [Abstract]  
Depreciation (12,926)
Accumulated depreciation as at December 31, 2019 (12,884)
Balance as at January 1, 2019 55,159
Balance as at December 31, 2019 53,983
Buildings [member] | Accumulated Depreciation [Member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Effect of translation adjustments 42
Disclosure Of Depreciation And Amortisation Expense [Abstract]  
Effect of translation adjustments 42
Vehicles [member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Balance as at January 1, 2019 639
Balance as at December 31, 2019 735
Disclosure Of Depreciation And Amortisation Expense [Abstract]  
Depreciation (301)
Accumulated depreciation as at December 31, 2019 (302)
Balance as at January 1, 2019 639
Balance as at December 31, 2019 735
Vehicles [member] | Accumulated Depreciation [Member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Effect of translation adjustments (1)
Disclosure Of Depreciation And Amortisation Expense [Abstract]  
Effect of translation adjustments (1)
Right-of-use assets [member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Balance as at January 1, 2019 55,798
Additions 11,181
Effect of translation adjustments 925
Balance as at December 31, 2019 67,904
Disclosure Of Depreciation And Amortisation Expense [Abstract]  
Effect of translation adjustments 925
Balance as at January 1, 2019 55,798
Balance as at December 31, 2019 67,904
Right-of-use assets [member] | Buildings [member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Balance as at January 1, 2019 55,159
Additions 10,786
Effect of translation adjustments 922
Balance as at December 31, 2019 66,867
Disclosure Of Depreciation And Amortisation Expense [Abstract]  
Effect of translation adjustments 922
Balance as at January 1, 2019 55,159
Balance as at December 31, 2019 66,867
Right-of-use assets [member] | Vehicles [member]  
Disclosure of quantitative information about right-of-use assets [line items]  
Balance as at January 1, 2019 639
Additions 395
Effect of translation adjustments 3
Balance as at December 31, 2019 1,037
Disclosure Of Depreciation And Amortisation Expense [Abstract]  
Effect of translation adjustments 3
Balance as at January 1, 2019 639
Balance as at December 31, 2019 € 1,037