Share-Based Compensation - Summary of Share-Based Compensation Expense Related to Share-Based Awards (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expenses	$ 4,603	$ 3,539	$ 8,861	$ 7,002
Cost of software services, maintenance and subscriptions [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expenses	746	513	1,447	1,026
Selling, general and administrative expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expenses	$ 3,857	$ 3,026	$ 7,414	$ 5,976