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Stock-Based Compensation (Detail) - (Table 5) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 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 346,500
Granted (in Dollars per share) $ 44.02
Exercised (284,000)
Exercised (in Dollars per share) $ 14.73
Cancelled/Forfeited (25,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 29.99
Outstanding at June 30, 2012 2,306,500
Outstanding at June 30, 2012 (in Dollars per share) $ 24.77
Outstanding at June 30, 2012 4 years 10 months
Outstanding at June 30, 2012 (in Dollars) $ 54,625
Exercisable at June 30, 2012 1,431,000
Exercisable at June 30, 2012 (in Dollars per share) $ 18.78
Exercisable at June 30, 2012 4 years
Exercisable at June 30, 2012 (in Dollars) $ 42,360