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Stock-Based Compensation (Detail) - (Table 6) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |
Proceeds from Stock Options Exercised | $ 6,212,000 | $ 13,036,000 | $ 16,433,000
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 | 5,137,000 | 5,876,000 | 6,287,000
Non-vested at January 1 (in Dollars per share) | $ 18.42 | $ 17.37 | $ 17.29
Granted | 633,000 | 509,000 | 413,000
Granted (in Dollars per share) | $ 32.64 | $ 31.70 | $ 25.11
Vested | (1,200,000) | (1,177,000) | (762,000)
Vested (in Dollars per share) | $ 19.40 | $ 18.44 | $ 20.39
Non-vested at June 30 | 4,427,000 | 5,137,000 | 5,876,000
Non-vested at June 30 (in Dollars per share) | $ 19.84 | $ 18.42 | $ 17.37
Forfeited | (143,000) | (71,000) | (62,000)
Forfeitures (in dollars per share) | $ 28.61 | $ 25.61 | $ 23.65
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 4,268,000 | $ 6,841,000 | $ 9,936,000

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