Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,815,554	$ 1,480,349
Accumulated depreciation and amortization	(1,062,374)	(878,758)
Property and equipment, net	753,180	601,591
Computer and networking equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,046,739	850,533
Purchased software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	46,509	46,537
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 35,212	27,923
Estimated useful life (in years)	5 years
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 21,108	14,035
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	119,466	92,544
Internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 546,520	$ 448,777
Minimum | Computer and networking equipment
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
Minimum | Purchased software
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
Minimum | Office equipment
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	1 year
Minimum | Internal-use software
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	2 years
Maximum | Computer and networking equipment
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	7 years
Maximum | Purchased software
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	10 years
Maximum | Office equipment
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	16 years
Maximum | Internal-use software
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	7 years