Valuation and Qualifying Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Allowance For Inventory Obsolescence
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 4,671		$ 1,266		$ 1,257
Charged to Costs and Expenses	10,556		4,588		217
Deductions	(7,990)	[1]	(1,183)	[1]	(208)	[1]
Balance at End of Period	7,237		4,671		1,266
Allowance for Sales Returns
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	852	[2]	469	[2]	1,033	[2]
Charged to Costs and Expenses	206	[2]	400	[2]	(235)	[2]
Deductions	(533)	[1],[2]	(17)	[1],[2]	(329)	[1],[2]
Balance at End of Period	525	[2]	852	[2]	469	[2]
Allowance for rebates
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	339	[2]	295	[2]	261	[2]
Charged to Costs and Expenses	2,840	[2]	551	[2]	543	[2]
Deductions	(2,940)	[1],[2]	(507)	[1],[2]	(509)	[1],[2]
Balance at End of Period	239	[2]	339	[2]	295	[2]
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	28		25		18
Charged to Costs and Expenses	79		3		7
Deductions	(107)	[1]
Balance at End of Period			28		25
Reserve for inventory purchase and other contractual commitments
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	345
Charged to Costs and Expenses	5,119		345
Deductions	(290)	[1]
Balance at End of Period	$ 5,174		$ 345

[1] Charges to the accounts are for the purposes for which the reserves were created.

[2] Included within other current liabilities in the Company's consolidated balance sheets.