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Summary of Significant Accounting Policies - Additional Information (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2017
Disclosure of initial application of standards or interpretations [line items]        
Expected loss rates payment period 36 months      
Contractual payments period 180 days      
Shipping and handling expenses € 35,513 € 40,765   € 40,952
Advertising expenses 7,145 12,687   € 15,407
Commission Expenses € 8,393 € 10,225 € 9,512  
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%      
Software [member] | Bottom of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Intangible assets useful lives 3 years      
Software [member] | Top of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Intangible assets useful lives 5 years      
Trademarks and patents [member] | Bottom of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Intangible assets useful lives 3 years      
Trademarks and patents [member] | Top of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Intangible assets useful lives 5 years      
Other intangible assets [member] | Bottom of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Intangible assets useful lives 2 years      
Other intangible assets [member] | Top of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Intangible assets useful lives 5 years      
Buildings [member] | Bottom of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment useful lives 10 years      
Buildings [member] | Top of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment useful lives 50 years      
Machinery and equipment [member] | Bottom of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment useful lives 4 years      
Machinery and equipment [member] | Top of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment useful lives 10 years      
Office furniture and equipment [member] | Bottom of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment useful lives 5 years      
Office furniture and equipment [member] | Top of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment useful lives 10 years      
Retail gallery and store furnishing [member] | Bottom of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment useful lives 3 years      
Retail gallery and store furnishing [member] | Top of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment useful lives 4 years      
Leasehold improvements [member] | Bottom of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment useful lives 5 years      
Leasehold improvements [member] | Top of range [member]        
Disclosure of initial application of standards or interpretations [line items]        
Property, plant and equipment useful lives 10 years