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Stock-Based Compensation (Detail) - (Table 6) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 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 4,067,000 4,257,000 4,333,500
Non-vested at January 1 (in Dollars per share) $ 24.69 $ 24.24 $ 23.16
Granted 361,000 182,000 434,000
Granted (in Dollars per share) $ 35.71 $ 34.88 $ 29.21
Vested (304,000) (345,000) (473,500)
Vested (in Dollars per share) $ 23.24 $ 24.11 $ 19.65
Non-vested at June 30 4,055,000 4,067,000 4,257,000
Non-vested at June 30 (in Dollars per share) $ 25.32 $ 24.69 $ 24.24
Forfeited (69,000) (27,000) (37,000)
Forfeitures (in dollars per share) $ 34.23 $ 29.34 $ 18.82