Commitments, Contingencies and Legal Matters - Summary of Changes in Product Warranties (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Product Warranty Liability [Line Items]
Balance at the beginning of the period	$ 6,334	$ 17,617
Accruals for warranties issued during the period	1,183	7,180
Adjustments to pre-existing accruals (including changes in estimates)	(998)	508
Warranty liabilities related to discontinued operations		(13,000)
Warranty liabilities assumed in SandForce acquisition	426
Settlements made during the period (in cash or in kind)	(1,519)	(5,971)
Balance at the end of the period	$ 5,426	$ 6,334