Segment Information (Revenues By Geographic Location) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net revenues	$ 641,422	$ 565,348	$ 1,846,127	$ 1,587,026
Enterprise Divisions [Member]
Net revenues	511,763	455,790	1,470,225	1,271,217
Enterprise Divisions [Member] | Americas [Member]
Net revenues	281,896	262,629	794,148	715,104
Enterprise Divisions [Member] | EMEA [Member]
Net revenues	164,149	136,794	488,196	406,116
Enterprise Divisions [Member] | Asia-Pacific [Member]
Net revenues	65,718	56,367	187,881	149,997
Online Services Division [Member]
Net revenues	129,659	109,558	375,902	315,809
Online Services Division [Member] | Americas [Member]
Net revenues	109,935	92,975	319,946	271,925
Online Services Division [Member] | EMEA [Member]
Net revenues	15,941	14,074	45,974	36,795
Online Services Division [Member] | Asia-Pacific [Member]
Net revenues	$ 3,783	$ 2,509	$ 9,982	$ 7,089