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Summary of Significant Accounting Policies - Additional Information (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Disclosure of initial application of standards or interpretations [line items]      
Expected loss rates payment period 36 months    
Contractual payments period 120 days    
Shipping and handling expenses € 40,765 € 40,952  
Advertising expenses € 12,687 € 15,407  
Software [member]      
Disclosure of initial application of standards or interpretations [line items]      
Intangible assets useful lives 3-5 years    
Trademarks and patents [member]      
Disclosure of initial application of standards or interpretations [line items]      
Intangible assets useful lives 3-5 years    
Other intangible assets [member]      
Disclosure of initial application of standards or interpretations [line items]      
Intangible assets useful lives 2-5 years    
IFRS 16 [member]      
Disclosure of initial application of standards or interpretations [line items]      
Lease liabilities     € 80,000
Non-cancellable operating lease     € 62,000
Buildings [member]      
Disclosure of initial application of standards or interpretations [line items]      
Property, plant and equipment useful lives 10-50 years    
Plant and equipment [member]      
Disclosure of initial application of standards or interpretations [line items]      
Property, plant and equipment useful lives 4-10 years    
Fixtures and fittings [member]      
Disclosure of initial application of standards or interpretations [line items]      
Property, plant and equipment useful lives 5-10 years    
Bottom of range [member]      
Disclosure of initial application of standards or interpretations [line items]      
Proportion of voting rights held in associate 20.00%    
Top of range [member]      
Disclosure of initial application of standards or interpretations [line items]      
Proportion of voting rights held in associate 50.00%