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Accounting for Stock- Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 1 Months Ended
Mar. 31, 2013
Mar. 31, 2013
Stock Options
Mar. 31, 2013
Restricted Stock Units (RSUs)
Mar. 31, 2013
Performance Options
Mar. 07, 2013
Performance based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted         5,846,000
Weighted average grant date fair value of the stock options granted         $ 2.81
Unrecognized compensation cost related to non-vested stock options   $ 13,600,000 $ 22,700,000    
Weighted average vesting period for unrecognized compensation cost 1 year 7 months 6 days        
Unrecognized expenses milestones not considered probable of achievement     $ 3,700,000 $ 107,000