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Stock-Based Compensation (Detail) - (Table 6) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 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 4,191,000 4,055,000 4,067,000
Non-vested at January 1 (in Dollars per share) $ 25.93 $ 25.32 $ 24.69
Granted 275,000 434,000 361,000
Granted (in Dollars per share) $ 37.67 $ 34.30 $ 35.71
Vested (508,000) (276,000) (304,000)
Vested (in Dollars per share) $ 30.58 $ 30.28 $ 23.24
Non-vested at June 30 3,916,000 4,191,000 4,055,000
Non-vested at June 30 (in Dollars per share) $ 26.05 $ 25.93 $ 25.32
Forfeited (42,000) (22,000) (69,000)
Forfeitures (in dollars per share) $ 35.47 $ 33.45 $ 34.23