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Stock-Based Compensation (Detail) - (Table 5) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at January 1, 2012 3,403,500
Outstanding at January 1, 2012 (in Dollars per share) $ 13.71
Granted 544,000
Granted (in Dollars per share) $ 29.58
Exercised (492,000)
Exercised (in Dollars per share) $ 10.02
Cancelled/Forfeited (41,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 20.60
Outstanding at June 30, 2012 3,414,500
Outstanding at June 30, 2012 (in Dollars per share) $ 16.71
Outstanding at June 30, 2012 4 years 7 months
Outstanding at June 30, 2012 (in Dollars) $ 65,600
Exercisable at June 30, 2012 2,153,000
Exercisable at June 30, 2012 (in Dollars per share) $ 12.70
Exercisable at June 30, 2012 3 years 8 months
Exercisable at June 30, 2012 (in Dollars) $ 49,913