Reconciliation of Segment Information to Consolidated Totals (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Segment contribution margin	$ 134,274	$ 130,751	$ 409,943	$ 428,360
Corporate and unallocated costs	(110,640)	(106,718)	(323,645)	(314,247)
Stock-based compensation	(17,202)	(24,823)	(53,300)	(65,071)
Effect of stock-based compensation cost on warranty expense	(120)	(169)	(421)	(541)
Acquisition-related costs	(39)	(6,334)	(3,411)	(11,793)
Amortization of purchased intangibles	(3,735)	(4,421)	(11,279)	(13,044)
Restructuring costs	(24,887)	(6,171)	(34,639)	(21,829)
Interest and other income (expense), net	(1,634)	(230)	(2,777)	(3,010)
Loss from continuing operations before provision for (benefit from) income taxes	(23,983)	(18,115)	(19,529)	(1,175)
Gross accounts receivable	217,588		217,588		239,151
Returns and related reserves	(39,643)		(39,643)		(41,576)
Allowance for doubtful accounts	(2,722)		(2,722)		(2,921)
Total trade receivables, net	$ 175,223		$ 175,223		$ 194,654