Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Agreement	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Revenue	$ 453,277	$ 449,767	$ 891,728	$ 866,675
ICE
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of distinct multiple element arrangements | Agreement			5
Revenue	70,800	$ 65,800	$ 141,500	$ 101,800
Deferred revenue	$ 80,000		$ 80,000		$ 94,600