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Stock-Based Compensation (Detail) - (Table 6) (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]    
Non-vested at January 1 2,889,000 671,000
Non-vested at January 1 (in Dollars per share) $ 34.74 $ 25.44
Granted 273,500 1,140,000
Granted (in Dollars per share) $ 43.32 $ 41.13
Vested (211,000) (169,000)
Vested (in Dollars per share) $ 37.10 $ 24.80
Forfeited (16,000) 0
Forfeitures (in dollars per share) $ 30.81 $ 0
Non-vested at March 31 2,935,500 1,642,000
Non-vested at March 31 (in Dollars per share) $ 36.77 $ 36.40