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Right-of-use-assets - Summary of amounts recognized in statement of net income loss (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Presentation Of Leases For Lessee [Abstract]    
Depreciation charge of right-of-use assets € 13,376 € 13,227
Interest on lease liabilities 2,613 2,635
Expenses relating to short-term leases 719 1,090
Expenses relating to leases of low-value assets, excluding short-term leases 122 132
Rent concessions (1,799)  
Total € 15,031 € 17,084