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Stock-Based Compensation (Detail) - (Table 6) - USD ($)
6 Months Ended
Jun. 30, 2016
Jun. 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 339,000 246,000
Granted (in Dollars per share) $ 34.24 $ 36.40
Vested (187,000) (222,000)
Vested (in Dollars per share) $ 30.30 $ 22.94
Forfeited 0 (68,000)
Forfeitures (in dollars per share) $ 0.00 $ 34.27
Non-vested at March 31 4,207,000 4,023,000
Non-vested at March 31 (in Dollars per share) $ 25.87 $ 25.16