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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 |  |  |

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