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Financial Instruments - Fair Values and Risk Management - Summary of Trade Receivables Past Due (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about financial instruments [line items]    
Trade receivables € 41,259 € 33,934
Gross carrying amount [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 46,584 41,815
Accumulated impairment [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables (5,325) (7,881)
Current (not past due)    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 30,146 28,919
From 1 to 29 days past due    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 7,854 3,877
From 30 to 60 days past due    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 1,030 1,105
From 61 to 90 days past due    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 355 347
More than 90 days past due    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables € 7,199 € 7,567