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Stock-Based Compensation (Detail) - (Table 6) (USD $)
9 Months Ended
Sep. 30, 2013
Sep. 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 4,333,500 1,006,500
Non-vested at January 1 (in Dollars per share) $ 23.16 $ 16.96
Granted 425,000 3,613,500
Granted (in Dollars per share) $ 29.07 $ 24.15
Vested (340,500) (258,000)
Vested (in Dollars per share) $ 24.92 $ 16.74
Forfeited (37,000) (3,000)
Forfeitures (in dollars per share) $ 21.49 $ 25.40
Non-vested at March 31 4,381,000 4,359,000
Non-vested at March 31 (in Dollars per share) $ 24.14 $ 22.93