Balance Sheet Components (Property and Equipment and Accumulated Depreciation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 357,196	$ 336,037
Less: Accumulated depreciation	(223,591)	(204,356)
Property and equipment, net	133,605	131,681
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	102,867	84,193
Property and equipment, useful life, years	3 years
Operations and other equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	96,361	100,207
Property and equipment, useful life, years	5 years
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	36,439	39,073
Property and equipment, useful life, years	3 years
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	21,011	18,208
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	51,194	45,393
Capital work-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 8,643	$ 8,282