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Stock-Based Compensation (Detail) - (Table 6) - USD ($)
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
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 5,873,000 6,287,000
Non-vested at January 1 (in Dollars per share) $ 17.37 $ 17.29
Granted 372,000 389,000
Granted (in Dollars per share) $ 31.47 $ 24.92
Vested (294,000) (320,000)
Vested (in Dollars per share) $ 23.79 $ 22.17
Forfeited (71,000) (51,000)
Forfeitures (in dollars per share) $ 25.61 $ 23.39
Non-vested at March 31 5,880,000 6,305,000
Non-vested at March 31 (in Dollars per share) $ 17.84 $ 17.46