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Financial Instruments - Fair Values and Risk Management - Impairment Losses on Financial Assets Recognised in Profit or Loss (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Financial Instruments [Abstract]      
Impairment loss on trade receivables € 110 € 1,802 € 2,389