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Bank Overdraft and Short-term Borrowings - Additional Information (Detail) - EUR (€)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of risk management strategy related to hedge accounting [line items]    
Unused credit facility € 24,251,000  
Commitment fee 0  
Bank overdraft and short-term borrowings 18,412,000 € 20,943,000
Currency risk [member] | Short-term borrowings [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Bank overdraft and short-term borrowings 253,000 € 254,000
Trade receivables export [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Unused credit facility 18,080,000  
Trade receivables secured borrowings [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Unused credit facility 3,577,000  
Bank overdrafts [member]    
Disclosure of risk management strategy related to hedge accounting [line items]    
Unused credit facility € 2,594,000