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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, 2020
Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]    
Trade receivables € 33,934 € 29,187
Gross carrying amount [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 41,815 37,886
Gross carrying amount [member] | Insured trade receivables [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 21,468 10,663
Gross carrying amount [member] | Non-insured trade receivables [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables 20,347 27,223
Provision for doubtful accounts [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade receivables € (7,881) € (8,699)