Business Acquisitions - Schedule of Preliminary Allocation of the Purchase Price (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Apr. 06, 2015	Dec. 31, 2014
Allocation of the purchase consideration:
Goodwill	$ 1,135,500		$ 1,051,294
Octoshape [Member]
Allocation of the purchase consideration:
Cash		$ 664
Accounts receivable		1,976
Other current assets		393
Identifiable intangible assets		41,950
Goodwill		69,445
Deferred tax assets		5,230
Total assets acquired		119,658
Other current liabilities		(1,983)
Current deferred revenue		(770)
Deferred tax liabilities		(9,858)
Total liabilities assumed		(12,611)
Net assets acquired		$ 107,047