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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Effects of IFRS Adjustments on Income Tax Expense (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of comparative information prepared under previous GAAP [line items]    
Effects of IFRS adjustments on income tax expense € (7,556) € (3,817)
Effects of IFRS adjustments on deferred income tax expense 127 931
Total (7,429) (2,886) [1]
Domestic [member]    
Disclosure of comparative information prepared under previous GAAP [line items]    
Effects of IFRS adjustments on income tax expense (4,504) (40)
Effects of IFRS adjustments on deferred income tax expense 270 (310)
Foreign [member]    
Disclosure of comparative information prepared under previous GAAP [line items]    
Effects of IFRS adjustments on income tax expense (3,052) (3,777)
Effects of IFRS adjustments on deferred income tax expense € (143) 1,241
Previous GAAP [member]    
Disclosure of comparative information prepared under previous GAAP [line items]    
Effects of IFRS adjustments on income tax expense   (3,817)
Effects of IFRS adjustments on deferred income tax expense   1,241
Total   (2,576)
Previous GAAP [member] | Domestic [member]    
Disclosure of comparative information prepared under previous GAAP [line items]    
Effects of IFRS adjustments on income tax expense   (40)
Previous GAAP [member] | Foreign [member]    
Disclosure of comparative information prepared under previous GAAP [line items]    
Effects of IFRS adjustments on income tax expense   (3,777)
Effects of IFRS adjustments on deferred income tax expense   1,241
Effect of transition to IFRSs [member]    
Disclosure of comparative information prepared under previous GAAP [line items]    
Effects of IFRS adjustments on deferred income tax expense   (310)
Total   (310)
Effect of transition to IFRSs [member] | Domestic [member]    
Disclosure of comparative information prepared under previous GAAP [line items]    
Effects of IFRS adjustments on deferred income tax expense   € (310)
[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.