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Share-Based Compensation - Summary of Nonvested Restricted Stock Activity and Related Information (Detail) shares in Thousands	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Shares
Non-vested restricted stock outstanding at June 30, 2020 (in shares)	600
Restricted Shares
Shares
Non-vested restricted stock outstanding at December 31, 2019 (in shares)	561
Granted (in shares)	242
Vested (in shares)	(191)
Forfeited (in shares)	(36)
Non-vested restricted stock outstanding at June 30, 2020 (in shares)	576
Weighted Average  Grant Date Fair Value
Non-vested restricted stock outstanding at December 31, 2019 (in usd per share) | $ / shares	$ 72.46
Granted (in usd per share) | $ / shares	63.79
Vested (in usd per share) | $ / shares	72.21
Forfeited (in usd per share) | $ / shares	75.28
Non-vested restricted stock outstanding at June 30, 2020 (in usd per share) | $ / shares	$ 68.72

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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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-Publisher FASB
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-Paragraph 2
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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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