Stock-Based Compensation (Detail Of The Total Stock-Based Compensation Recognized By Income Statement Classification) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Stock-based compensation	$ 30,557	[1]	$ 17,884	[1]
Cost Of Services Revenues [Member]
Stock-based compensation	450		268
Research And Development [Member]
Stock-based compensation	11,144		5,685
Sales, Marketing And Services [Member]
Stock-based compensation	9,970		6,032
General And Administrative [Member]
Stock-based compensation	$ 8,993		$ 5,899

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