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Stock-Based Compensation (Detail) - (Table 5) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding at January 1, 2012   3,373,000
Outstanding at January 1, 2012 (in Dollars per share)   $ 17.01
Granted   449,000
Granted (in Dollars per share)   $ 34.97
Exercised   (176,000)
Exercised (in Dollars per share)   $ 16.71
Cancelled/Forfeited   (81,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price   $ 26.93
Outstanding at June 30, 2012 3,565,000 3,565,000
Outstanding at June 30, 2012 (in Dollars per share) $ 19.06 $ 19.06
Outstanding at June 30, 2012 3 years 2 months  
Outstanding at June 30, 2012 (in Dollars) $ 46,981 $ 46,981
Exercisable at June 30, 2012 2,442,000 2,442,000
Exercisable at June 30, 2012 (in Dollars per share) $ 14.22 $ 14.22
Exercisable at June 30, 2012 2 years 4 months  
Exercisable at June 30, 2012 (in Dollars) $ 43,988 $ 43,988