Nature of Business and Basis of Presentation - Narrative (Details) server in Thousands, $ in Millions	6 Months Ended
	Jun. 30, 2016 network segment country server	Dec. 31, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of servers (over 219,000) | server	219
Number of networks (more than 1,500) | network	1,500
Approximate number of countries in which servers are located (approximately 125) | country	125
Number of industry segments | segment	1
Accounting Standards Update 2015-03 [Member] | Other Assets [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs		$ (6.2)
Accounting Standards Update 2015-03 [Member] | Convertible senior notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issuance costs		$ 6.2