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Stock-Based Compensation (Detail) - (Table 6) - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
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 4,191,000 4,055,000
Non-vested at January 1 (in Dollars per share) $ 25.93 $ 25.32
Granted 259,000 377,000
Granted (in Dollars per share) $ 37.38 $ 34.22
Vested (213,000) (193,000)
Vested (in Dollars per share) $ 33.25 $ 30.44
Forfeited (34,000) 0
Forfeitures (in dollars per share) $ 35.08 $ 0.00
Non-vested at March 31 4,203,000 4,239,000
Non-vested at March 31 (in Dollars per share) $ 26.19 $ 25.93