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Stock Option and Restricted Stock Unit Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 15,687 $ 11,779 $ 27,290 $ 24,472
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 4,390 1,674 7,189 4,234
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 11,297 $ 10,105 $ 20,101 $ 20,238