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Stock-Based Compensation (Detail) - (Table 6) - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
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 4,067,000 4,257,000
Non-vested at January 1 (in Dollars per share) $ 24.69 $ 24.24
Granted 284,000 168,000
Granted (in Dollars per share) $ 37.10 $ 35.05
Vested (235,000) (244,000)
Vested (in Dollars per share) $ 22.94 $ 24.64
Forfeited (68,000) (2,000)
Forfeitures (in dollars per share) $ 34.27 $ 27.03
Non-vested at March 31 4,048,000 4,179,000
Non-vested at March 31 (in Dollars per share) $ 25.29 $ 24.54