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Financial Instruments - Fair Values and Risk Management - Summary of Sensitivity to Reasonably Possible Change in Interest Rates on that Portion of Loans and Borrowings Affected (Detail) - Market risk [member] - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Increase in basis points [member]    
Disclosure of credit risk exposure [line items]    
Effect on profit before tax € 2,776 € 3,023
Decrease in basis points [member]    
Disclosure of credit risk exposure [line items]    
Effect on profit before tax € (3,183) € (3,449)
Floating-rate borrowings [member] | Increase in basis points [member]    
Disclosure of credit risk exposure [line items]    
Increase/decrease in basis points + 45 - 45
Effect on profit before tax € (71) € (90)
Floating-rate borrowings [member] | Decrease in basis points [member]    
Disclosure of credit risk exposure [line items]    
Increase/decrease in basis points - 45 - 45
Effect on profit before tax € 71 € 78