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Stock-Based Compensation (Detail) - (Table 5) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at January 1, 2012 2,269,000
Outstanding at January 1, 2012 (in Dollars per share) $ 20.57
Granted 208,500
Granted (in Dollars per share) $ 43.55
Exercised (31,000)
Exercised (in Dollars per share) $ 21.07
Cancelled/Forfeited (16,500)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 25.01
Outstanding at June 30, 2012 2,430,000
Outstanding at June 30, 2012 (in Dollars per share) $ 22.57
Outstanding at June 30, 2012 4 years 8 months
Outstanding at June 30, 2012 (in Dollars) $ 50,357
Exercisable at June 30, 2012 1,244,500
Exercisable at June 30, 2012 (in Dollars per share) $ 19.21
Exercisable at June 30, 2012 4 years 2 months
Exercisable at June 30, 2012 (in Dollars) $ 29,887