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Stock-based Compensation - Schedule of Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 9,528 $ 9,034 $ 28,087 $ 25,151
Income tax effect (2,787) (2,553) (7,451) (6,998)
Stock-based compensation expense, net of tax 6,741 6,481 20,636 18,153
Employee Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 329 37 385 191
RSUs [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 8,209 7,853 24,485 22,784
ESPP [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 990 $ 1,144 $ 3,217 $ 2,176