Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,084,707	$ 1,815,554
Accumulated depreciation and amortization	(1,283,690)	(1,062,374)
Property and equipment, net	801,017	753,180
Computer and networking equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,170,471	1,046,739
Purchased software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	51,727	46,509
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 41,968	35,212
Estimated useful life (in years)	5 years
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 24,497	21,108
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	139,991	119,466
Internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 656,053	$ 546,520
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