Business Combinations - Schedule of Preliminary Allocation of the Purchase Price (Details) - USD ($) $ in Thousands	1 Months Ended
	Apr. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Allocation of the purchase consideration:
Goodwill		$ 1,356,623	$ 1,228,503
SOASTA, Inc. [Member]
Business Acquisition [Line Items]
Total purchase consideration	$ 199,280
Allocation of the purchase consideration:
Cash	1,935
Accounts receivable	4,108
Prepaids and other current assets	1,143
Identifiable intangible assets	49,900
Goodwill	121,669
Deferred tax assets	35,121
Total assets acquired	213,876
Accounts payable	(1,119)
Accrued liabilities	(3,915)
Deferred revenue	(9,562)
Total liabilities assumed	(14,596)
Net assets acquired	$ 199,280