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Trade Receivables - Summary of Changes in Provision for Doubtful Accounts (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Changes In Allowance For Doubtful Accounts [Abstract]    
Balance at beginning of year € 8,699 € 9,627
Charges – bad debt expense 1,802 2,389
Reductions – write off of uncollectible amounts (1,024) (3,317)
Reclassification to assets held for sale (1,596)  
Balance at end of year € 7,881 € 8,699