Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Agreement	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
REVENUES	$ 474,935	$ 459,957	$ 1,385,651	$ 1,345,252
ICE
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of distinct multiple element arrangements | Agreement			5
REVENUES	71,300	$ 71,000	$ 212,800	$ 172,800
Deferred revenue	$ 72,300		$ 72,300		$ 94,600