Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Agreement	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Revenue	$ 438,451	$ 416,908
ICE
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of distinct multiple element arrangements | Agreement	5
Revenue	$ 70,700	$ 36,000
Deferred revenue	$ 87,300		$ 94,600