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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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