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Options Outstanding and Exercisable (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding 9,649,560 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 5 years 9 months 18 days [1]
Options Outstanding, Weighted-Average Exercise Price $ 14.39 [1]
Options Exercisable 6,314,661 [2]
Options Exercisable, Weighted-Average Exercise Price $ 12.35 [2]
Exercise Price Range One
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower limit $ 9.00
Range of Exercise Prices, upper limit $ 11.99
Options Outstanding 2,788,572 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 3 years [1]
Options Outstanding, Weighted-Average Exercise Price $ 9.71 [1]
Options Exercisable 2,788,572 [2]
Options Exercisable, Weighted-Average Exercise Price $ 9.71 [2]
Exercise Price Range Two
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower limit $ 12.00
Range of Exercise Prices, upper limit $ 14.00
Options Outstanding 4,590,316 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 10 months 24 days [1]
Options Outstanding, Weighted-Average Exercise Price $ 13.07 [1]
Options Exercisable 2,557,659 [2]
Options Exercisable, Weighted-Average Exercise Price $ 13.21 [2]
Exercise Price Range Three
  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, Lower limit $ 14.01
Range of Exercise Prices, upper limit $ 40.96
Options Outstanding 2,270,672 [1]
Options Outstanding, Weighted-Average Remaining Contractual Life 6 years 6 months [1]
Options Outstanding, Weighted-Average Exercise Price $ 22.82 [1]
Options Exercisable 968,430 [2]
Options Exercisable, Weighted-Average Exercise Price $ 17.69 [2]
[1] At December 31, 2013, the aggregate intrinsic value of options outstanding was $302.1 million.
[2] At December 31, 2013, the weighted-average remaining contractual life of options exercisable was 4.5 years and the aggregate intrinsic value of options exercisable was $210.6 million.