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Accounting for Stock- Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2013
May 23, 2013
Performance Based Stock Options
May 23, 2013
Performance Based Restricted Stock Units
Mar. 07, 2013
Performance Based Restricted Stock Units
Sep. 30, 2013
Stock Options
Sep. 30, 2013
Restricted Stock Units (RSUs)
Sep. 30, 2013
Performance Options
Sep. 30, 2013
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Options granted     5,598,100 1,687,900 5,846,000        
Weighted average grant date fair value of the stock options granted     $ 3.05 $ 6.85 $ 2.81   $ 5.89   $ 4.14
Share based payment award , vesting period 4 years                
Fair value of restricted stock units 732,350                
Number of restricted stock options 1,106,000                
Unrecognized compensation cost related to non-vested stock options           $ 27,100,000 $ 21,400,000    
Weighted average vesting period for unrecognized compensation cost   1 year 6 months              
Unrecognized expenses milestones not considered probable of achievement             $ 3,700,000 $ 107,000