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Stock-Based Compensation (Detail) - (Table 5) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at January 1, 2012 2,703,000
Outstanding at January 1, 2012 (in Dollars per share) $ 17.79
Granted 213,000
Granted (in Dollars per share) $ 40.30
Exercised (423,000)
Exercised (in Dollars per share) $ 16.51
Cancelled/Forfeited (39,000)
Outstanding at June 30, 2012 2,454,000
Outstanding at June 30, 2012 (in Dollars per share) $ 19.96
Outstanding at June 30, 2012 4 years 2 months
Outstanding at June 30, 2012 (in Dollars) $ 58,312
Exercisable at June 30, 2012 1,185,000
Exercisable at June 30, 2012 (in Dollars per share) $ 16.94
Exercisable at June 30, 2012 3 years 9 months
Exercisable at June 30, 2012 (in Dollars) $ 31,732
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 17.67