Employee Stock-Based Compensation and Benefit Plans (Detail of the Total Stock-Based Compensation Recognized by Income Statement Classification) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Stock-based compensation	$ 92,909	[1]	$ 103,758	[1]	$ 111,419	[1]
Cost Of Services Revenues [Member]
Stock-based compensation	1,584		1,363		1,868
Research And Development [Member]
Stock-based compensation	31,763		54,123		55,012
Sales, Marketing And Services [Member]
Stock-based compensation	31,354		28,704		32,244
General And Administrative [Member]
Stock-based compensation	$ 28,208		$ 19,568		$ 22,295

[1] Represents expenses presented to management on a consolidated basis only and not allocated to the operating segments.