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Financial Instruments - Fair Values and Risk Management - Summary of Insured and Non-insured Trade Receivables (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
Gross carrying amount [member] | Insured trade receivables [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 26,459 21,468
Gross carrying amount [member] | Non-insured trade receivables [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 20,125 20,347
Provision for doubtful accounts [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables € (5,325) € (7,881)