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Stock Incentive Plans and Stock Purchase Plans - Schedule of Restricted Stock and Deferred Stock Awards (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of Shares, Non-vested shares at January 1, 2019	1,310,853
Number of Shares, Awarded	1,112,773
Number of Shares, Forfeited	(137,091)
Number of Shares, Vested	(563,420)
Number of Shares, Non-vested shares at December 31, 2019	1,723,115	1,310,853
Weighted Average Fair Value, Non-vested shares at January 1, 2019	$ 54.46
Weighted Average Fair Value, Awarded	33.28	$ 51.99	$ 54.22
Weighted Average Fair Value, Forfeited	48.37
Weighted Average Fair Value, Vested	55.96
Weighted Average Fair Value, Non-vested shares at December 31, 2019	$ 40.77	$ 54.46

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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