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Share-Based Compensation - Summary of Share-Based Compensation Expense Related to Share-Based Awards (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 20,182 $ 14,819 $ 11,653
Tax benefit (5,986) (4,237) (3,363)
Net decrease in net income 14,196 10,582 8,290
Cost of software services, maintenance and subscriptions [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense 3,380 2,177 1,509
Selling, general and administrative expenses [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Share-based compensation expense $ 16,802 $ 12,642 $ 10,144