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Stock-Based Compensation (Detail) - (Table 6) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
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 4,257,000 4,333,500
Non-vested at January 1 (in Dollars per share) $ 24.24 $ 23.16
Granted 168,000 425,000
Granted (in Dollars per share) $ 35.05 $ 29.07
Vested (244,000) (340,500)
Vested (in Dollars per share) $ 24.64 $ 24.92
Forfeited (2,000) (37,000)
Forfeitures (in dollars per share) $ 27.03 $ 21.49
Non-vested at March 31 4,179,000 4,381,000
Non-vested at March 31 (in Dollars per share) $ 24.54 $ 24.14