Business Acquisitions - Schedule of Preliminary Allocation of the Purchase Price (Details) - USD ($) $ in Thousands	Apr. 06, 2015	Jun. 30, 2015	Dec. 31, 2014
Allocation of the purchase consideration:
Goodwill		$ 1,135,947	$ 1,051,294
Octoshape [Member]
Business Acquisition [Line Items]
Total purchase consideration	$ 107,547
Allocation of the purchase consideration:
Cash	664
Accounts receivable	1,976
Other current assets	393
Identifiable intangible assets	41,950
Goodwill	69,945
Deferred tax assets	5,230
Total assets acquired	120,158
Other current liabilities	(1,983)
Current deferred revenue	(770)
Deferred tax liabilities	(9,858)
Total liabilities assumed	(12,611)
Net assets acquired	$ 107,547