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Financial Instruments - Fair Values and Risk Management - Summary of Sensitivity to Reasonably Possible Change in Foreign Exchange Rates and Impact on Profit Before Tax (Detail) - Market risk [member] - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Increase in basis points [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in foreign exchange rates 5.00% 5.00%
Effect on profit before tax € 2,776 € 3,023
Decrease in basis points [member]    
Disclosure of nature and extent of risks arising from financial instruments [line items]    
Change in foreign exchange rates (5.00%) (5.00%)
Effect on profit before tax € (3,183) € (3,449)