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Stock-Based Compensation (Detail) - (Table 6) - USD ($)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
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 4,055,000 4,067,000
Non-vested at January 1 (in Dollars per share) $ 25.32 $ 24.69
Granted 377,000 284,000
Granted (in Dollars per share) $ 34.22 $ 37.10
Vested (193,000) (235,000)
Vested (in Dollars per share) $ 30.44 $ 22.94
Forfeited 0 (68,000)
Forfeitures (in dollars per share) $ 0.00 $ 34.27
Non-vested at March 31 4,239,000 4,048,000
Non-vested at March 31 (in Dollars per share) $ 25.93 $ 25.29