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