Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Stock Option Activity (Detail)

v2.4.0.8
Stock Based Compensation - Stock Option Activity (Detail) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Shares Underlying Options, Outstanding at beginning of period 4,065    
Number of Shares Underlying Options, Granted 1,836 1,024 1,169
Number of Shares Underlying Options, Exercised (877) (759) (302)
Number of Shares Underlying Options, Forfeited (97)    
Number of Shares Underlying Options, Outstanding at end of period 4,927 4,065  
Number of Shares Underlying Options, Vested - end of period 3,459    
Number of Shares Underlying Options, Vested and expected to vest - end of period 4,854    
Weighted Average Exercise Price Per Share, Outstanding at beginning of period $ 6.12    
Weighted Average Exercise Price Per Share, Granted $ 7.55    
Weighted Average Exercise Price Per Share, Exercised $ 4.25 $ 4.62 $ 4.12
Weighted Average Exercise Price Per Share, Forfeited $ 7.51    
Weighted Average Exercise Price Per Share, Outstanding at end of period $ 6.95 $ 6.12  
Weighted Average Exercise Price Per Share, Vested - end of period $ 6.58    
Weighted Average Exercise Price Per Share, Vested and expected to vest - end of period $ 6.95    
Weighted Average Remaining Contractual Term, Outstanding balance 2 years 10 months 6 days 2 years 7 months 24 days  
Weighted Average Remaining Contractual Term, Granted 4 years 29 days    
Weighted Average Remaining Contractual Term, Exercised 0 years    
Weighted Average Remaining Contractual Term, Forfeited 3 years 6 months 26 days    
Weighted Average Remaining Contractual Term, Exercisable at end of period 2 years 10 months 6 days 2 years 7 months 24 days  
Weighted Average Remaining Contractual Term, Vested - end of period 2 years 5 months 9 days    
Weighted Average Remaining Contractual Term, Vested and expected to vest - end of period 2 years 10 months 6 days    
Aggregate Intrinsic Value, Outstanding at end of period $ 2.81    
Aggregate Intrinsic Value, Vested - end of period 2.66    
Aggregate Intrinsic Value, Vested and expected to vest - end of the period $ 2.81