Nature of Business and Basis of Presentation (Details) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) segment country server	Mar. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of servers (more than 200,000) | server	200,000
Number of countries in which servers are located | country	130
Number of industry segments | segment	1
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by Operating Activities	$ 142,618	$ 191,373	$ 435,742	$ 687,590	$ 871,812	$ 793,452
Net Cash Used in Financing Activities	$ (88,858)	(116,871)	(205,025)	(291,088)	(359,779)	(297,029)
As Reported [Member] | Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Cash Provided by Operating Activities		190,238	433,110	684,510	866,298	764,151
Net Cash Used in Financing Activities		$ (115,736)	$ (202,393)	$ (288,008)	$ (354,265)	$ (267,728)