Segment Information (Net Revenues And Profit By Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013 segment		Sep. 30, 2012
Segment Reporting Information [Line Items]
Number of reportable segments					2
Net revenues	$ 712,731		$ 641,422		$ 2,116,014		$ 1,846,127
Segment profit	87,367		82,415		219,863		245,357
Amortization of intangible assets	(34,716)	[1]	(32,768)	[1]	(104,703)	[1]	(82,064)	[1]
Net interest and other income	3,438	[1]	8,483	[1]	6,009	[1]	15,636	[1]
Stock-based compensation	(45,893)	[1]	(40,103)	[1]	(137,306)	[1]	(108,922)	[1]
Consolidated income before income taxes	90,805		90,898		225,872		260,993
Infrastructure [Member]
Segment Reporting Information [Line Items]
Net revenues	564,552		511,763		1,686,411		1,470,225
Segment profit	134,598		130,566		380,445		371,515
SaaS [Member]
Segment Reporting Information [Line Items]
Net revenues	148,179		129,659		429,603		375,902
Segment profit	$ 33,378		$ 24,720		$ 81,427		$ 64,828

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