Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) Agreement	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Income tax (expense) benefit	$ (2,673)	$ (1,622)	$ (8,400)	$ (5,447)
REVENUES	442,845	474,935	$ 1,324,922	1,385,651
ICE
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of distinct multiple element arrangements | Agreement			5
REVENUES	42,500	$ 71,300	$ 127,600	$ 212,800
Deferred revenue	$ 56,800		56,800		$ 67,000
Accounting Standards Update 2016-09
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Income tax (expense) benefit			$ 1,000