Balance Sheet Components (Property And Equipment And Accumulated Depreciation) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 329,833	$ 306,038
Less: Accumulated depreciation	(196,230)	(169,685)
Property and equipment, net	133,603	136,353
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	79,851	67,090
Property and equipment, useful life (years)	3 years
Operations And Other Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	100,226	100,306
Property and equipment, useful life (years)	5 years
Software, including internal-use software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	38,450	35,356
Property and equipment, useful life (years)	3 years
Furniture And Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	17,014	17,310
Property and equipment, useful life (years)	3 years
Building [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	40,681	40,681
Property and equipment, useful life (years)	30 years
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	43,168	44,473
Capital work-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 10,443	$ 822