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Trade Receivables - Summary of Changes in Allowance for Doubtful Accounts (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of changes in allowance for doubtful accounts [abstract]    
Balance at beginning of year € 9,627 € 10,775
Effect of the adoption of IFRS 9 (see note 5) 0 37
Charges - bad debt expense 2,389 745
Reductions - write off of uncollectible amounts (3,317) (1,930)
Balance at end of year € 8,699 € 9,627