Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Nov. 30, 2009	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Significant Accounting Policies [Line Items]
Insurance coverage per depositor beginning 2013		$ 250,000
Non-interest bearing cash balance		All of the Company's non-interest bearing cash balances were fully insured at December 31, 2012 due to a temporary federal program in effect from December 31, 2010 through December 31, 2012.
Reserve for sales returns and allowances		34,373,000	43,440,000
Decrease reserve for sales returns and allowances		(9,067,000)	15,062,000	(5,519,000)
Convertible senior notes		100,000,000	100,000,000
Depreciation expense		13,600,000	13,900,000	15,700,000
Advertising expenses		18,800,000	15,500,000	15,400,000
Stock option expense				(224,000)
Restricted stock expense		1,122,000	1,594,000	4,619,000
Debt discount	13,700,000	13,700,000
Minimum
Significant Accounting Policies [Line Items]
Discount on invoiced amount of products		1.00%
Maximum
Significant Accounting Policies [Line Items]
Discount on invoiced amount of products		6.00%
4.50% Convertible senior notes
Significant Accounting Policies [Line Items]
Potentially dilutive securities excluded from computation of diluted earnings per common share		6,577,727	6,334,621
Debt, principle amount		100,000,000
Stock Options
Significant Accounting Policies [Line Items]
Potentially dilutive securities excluded from computation of diluted earnings per common share		134,644	171,119	301,499
Restricted Stock
Significant Accounting Policies [Line Items]
Potentially dilutive securities excluded from computation of diluted earnings per common share		93,933
Molds and tools
Significant Accounting Policies [Line Items]
Property and equipment useful life		2 years
4.50% Convertible senior notes (due 2014)
Significant Accounting Policies [Line Items]
Convertible senior note payable, fair value		107,900,000	113,900,000
Convertible senior notes		100,000,000	100,000,000
Debt instrument, maturity date	Nov. 01, 2014	Nov. 01, 2014
Debt instrument, interest rate		7.90%
Debt issuance costs		3,700,000
Debt instrument amortization period		5 years
4.50% Convertible senior notes (due 2014) | Fair Value Measurements, Level 1
Significant Accounting Policies [Line Items]
Convertible senior notes		$ 100,000,000	$ 100,000,000