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Stock Option and Restricted Stock Unit Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 12,038 $ 19,632 $ 36,510 $ 47,213
Stock Options
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense 3,448 3,493 7,682 7,711
Restricted Stock Units (RSUs)
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 8,590 $ 16,139 $ 28,828 $ 39,502