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Stock-Based Compensation - Restricted Stock Units Activity (Detail) - Restricted Stock Units	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Number of Restricted Stock Units
Non-vested at December 31, 2018 | shares	660,375
Granted | shares	468,617
Vested | shares	(314,482)
Forfeited | shares	(58,028)
Non-vested at December 31, 2019 | shares	756,482
Weighted-Average Grant-Date Fair Value
Non-vested at December 31, 2018 | $ / shares	$ 58.63
Granted | $ / shares	49.46
Vested | $ / shares	57.51
Forfeited | $ / shares	52.78
Non-vested at December 31, 2019 | $ / shares	$ 53.89

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)
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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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- 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 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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- Definition

Number of non-option equity instruments exercised by participants.

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