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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Impacts of IFRS Adjustments for Trade Receivables (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of comparative information prepared under previous GAAP [line items]      
Trade receivables € 40,967 € 37,549 € 40,138
Previous GAAP [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Trade receivables   46,852 53,087
Effect of transition to IFRSs [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Trade receivables   (9,303) (12,949)
Effect of transition to IFRSs [member] | Recognition of trade receivables [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Trade receivables   6,287 6,275
Effect of transition to IFRSs [member] | Revenue of finished goods derecognised [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Trade receivables   (15,590) (19,224)
IFRS [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Trade receivables   € 37,549 € 40,138