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Changes in Significant Accounting Policies - Summary of Reconciliation of operating lease to lease liabilities (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Disclosure Of Redesignated Financial Assets And Liabilities [Abstract]        
Operating lease commitments as at December 31, 2018 as disclosed under IAS 17 in the Group’s consolidated financial statements     € 80,740  
Effect due to discounted using the incremental borrowing rate as at January 1, 2019     63,320  
Effect due to recognition exemption for leases of low-value assets     33  
Effect due to recognition exemption for leases with less than 12 months of lease term at transition     1,744  
Effect due to extension options and other     4,785  
Lease liabilities recognised as at January 1, 2019 € 53,593 € 57,367 € 56,758 € 56,758