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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Effects of IFRS Adjustments on Net Exchange Rate Gains (Losses) (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of comparative information prepared under previous GAAP [line items]    
Gains losses on exchange differences on translation before tax € (3,914) € 1,033 [1]
Previous GAAP [member]    
Disclosure of comparative information prepared under previous GAAP [line items]    
Gains losses on exchange differences on translation before tax   3,252
Effect of transition to IFRSs [member]    
Disclosure of comparative information prepared under previous GAAP [line items]    
Gains losses on exchange differences on translation before tax   (2,219)
Functional currency adjustment [member] | Effect of transition to IFRSs [member]    
Disclosure of comparative information prepared under previous GAAP [line items]    
Gains losses on exchange differences on translation before tax   € (2,219)
[1] The Group has initially applied IFRS 9 as at January 1, 2018. Under the transition method chosen, comparative information has not been restated except for separately presenting impairment losses on trade receivables. See note 5.