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Accounting for Stock- Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2014
Employee
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of restricted stock units issued 720,000 158,600 46,400    
Number of stock options issued 1,053,900 252,600 17,700    
Number of employees under modified performance grants       124  
Increase in stock-based compensation expenses       $ 35,900,000  
Credit to stock compensation expense 12,900,000        
Remaining liability awards 0       0
Weighted average vesting period for unrecognized compensation cost         3 years
Stock Options
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based payment award , vesting period 4 years 4 years 4 years    
Fair value of the stock options granted , value 4,900,000 1,320,000 81,000    
Weighted average grant date fair value of the stock options granted $ 4.66 $ 5.31 $ 4.58    
Unrecognized compensation cost related to non vested stock options 10,300,000       10,300,000
Restricted Stock Units (RSUs)
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Fair value of Restricted stock options granted , value 5,100,000 1,230,000 296,000    
Weighted average grant date fair value of the stock options granted $ 7.09   $ 6.39    
Weighted average grant date fair value of restricted stock units   $ 7.76      
Unrecognized compensation cost related to non vested stock options 12,500,000       12,500,000
Non Employee Director Stock Options
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based payment award , vesting period   3 years      
Weighted average grant date fair value of the stock options granted   $ 5.22      
Performance Based Stock Options
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to non vested stock options 0       0
Performance Based Restricted Stock Units
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to non vested stock options $ 0       $ 0