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Financial Instruments - Fair Values and Risk Management - Summary of Information about Credit Risk Exposure on Trade Receivables Using a Provision Matrix (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of credit risk exposure [line items]        
Total gross carrying amount € 40,967   € 37,549 € 40,138
Gross carrying amount [member]        
Disclosure of credit risk exposure [line items]        
Total gross carrying amount 50,594   € 48,324 € 49,682
Credit risk [member] | Gross carrying amount [member]        
Disclosure of credit risk exposure [line items]        
Outstanding trade receivables 11,368 € 12,739    
Trade receivables subject to specific valuation 39,226 35,585    
Total gross carrying amount 50,594 48,324    
Expected credit loss 64 37    
Credit risk [member] | Less than Thirty days [member] | Gross carrying amount [member]        
Disclosure of credit risk exposure [line items]        
Outstanding trade receivables € 9,288 € 11,661    
Default rate 0.10% 0.11%    
Expected credit loss € 9 € 13    
Credit risk [member] | Thirty to sixty days [member] | Gross carrying amount [member]        
Disclosure of credit risk exposure [line items]        
Outstanding trade receivables € 1,323 € 651    
Default rate 0.99% 1.04%    
Expected credit loss € 13 € 7    
Credit risk [member] | Sixty One Days To Ninety Days [member] | Gross carrying amount [member]        
Disclosure of credit risk exposure [line items]        
Outstanding trade receivables € 88 € 254    
Default rate 2.90% 2.99%    
Expected credit loss € 3 € 8    
Credit risk [member] | Past Due Greater Than Ninety One Days [member] | Gross carrying amount [member]        
Disclosure of credit risk exposure [line items]        
Outstanding trade receivables € 669 € 173    
Default rate 5.80% 5.33%    
Expected credit loss € 39 € 9