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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2015
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Nonamortizable identifiable intangibles |  | $ 0 |  |  |  |
Catalog production and mailing costs amortization period |  | 3 months |  |  |  |
Excess tax benefit, amount | $ 4,300,000 |  |  |  |  |
Cumulative effect recognized on initial application of the new guidance | $ 3,535,746,000 | $ 1,616,595,000 |  | $ 2,169,002,000 | $ 2,343,878,000 | $ 3,741,316,000
Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash equivalents maturity period |  | 3 months |  |  |  |
Buildings | Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives, years |  | 10 years |  |  |  |
Buildings | Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives, years |  | 30 years |  |  |  |
Machinery and equipment | Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives, years |  | 3 years |  |  |  |
Machinery and equipment | Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives, years |  | 15 years |  |  |  |
Software | 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 |  |  |  |
Leasehold improvements | Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives, years |  | 10 years |  |  |  |
Leasehold improvements | Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives, years |  | 20 years |  |  |  |
Tools, dies, and molds |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives, years |  | 3 years |  |  |  |
Accounting Standards Update 2016-16 |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cumulative effect recognized on initial application of the new guidance |  |  | $ 9,400,000 |  |  |

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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