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Stock-Based Compensation (Detail) - (Table 6) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Proceeds from Stock Options Exercised $ 13,036,000 $ 16,433,000 $ 10,713,000
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 5,874,000 6,287,000 6,083,000
Non-vested at January 1 (in Dollars per share) $ 17.37 $ 17.29 $ 16.88
Granted 509,000 413,000 651,000
Granted (in Dollars per share) $ 31.70 $ 25.11 $ 22.87
Vested (1,177,000) (762,000) (414,000)
Vested (in Dollars per share) $ 18.44 $ 20.39 $ 20.19
Non-vested at June 30 5,135,000 5,874,000 6,287,000
Non-vested at June 30 (in Dollars per share) $ 18.42 $ 17.37 $ 17.29
Forfeited (71,000) (64,000) (33,000)
Forfeitures (in dollars per share) $ 25.61 $ 23.65 $ 22.30
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 6,841,000 $ 9,936,000 $ 16,983,000