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Stock-Based Compensation (Detail) - (Table 5) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Jun. 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 190,000
Granted (in Dollars per share) $ 40.71
Exercised (316,000)
Exercised (in Dollars per share) $ 15.69
Cancelled/Forfeited (1,000)
Outstanding at June 30, 2012 2,576,000
Outstanding at June 30, 2012 (in Dollars per share) $ 19.73
Outstanding at June 30, 2012 4 years 5 months 15 days
Outstanding at June 30, 2012 (in Dollars) $ 33,405
Exercisable at June 30, 2012 1,228,000
Exercisable at June 30, 2012 (in Dollars per share) $ 16.49
Exercisable at June 30, 2012 4 years
Exercisable at June 30, 2012 (in Dollars) $ 19,328
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price $ 24.71