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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017
Significant Accounting Policies [Line Items] |  |
Catalog production and mailing costs amortization period |  | 3 months
Excess tax benefit, amount | $ 4,300 |
Cumulative effect recognized on initial application of the new guidance | $ 3,545,359 | $ 2,179,358
Maximum |  |
Significant Accounting Policies [Line Items] |  |
Cash equivalents maturity period |  | 3 months
Buildings | Maximum |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives, years |  | 30 years
Buildings | Minimum |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives, years |  | 10 years
Machinery and equipment | Maximum |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives, years |  | 15 years
Machinery and equipment | Minimum |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives, years |  | 3 years
Software | Maximum |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives, years |  | 10 years
Software | Minimum |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives, years |  | 3 years
Leasehold improvements | Maximum |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives, years |  | 20 years
Leasehold improvements | Minimum |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives, years |  | 10 years
Tools, dies, and molds |  |
Significant Accounting Policies [Line Items] |  |
Estimated useful lives, years |  | 3 years
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |
Significant Accounting Policies [Line Items] |  |
Cumulative effect recognized on initial application of the new guidance |  | $ 29,000

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