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Employee Benefits - Summary of Equity-Based Awards for Employees (Detail)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Common Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested common stock awards, Beginning balance | shares	173,189
Granted | shares	88,529
Vested | shares	(106,347)
Forfeited/Cancelled | shares	(1,767)
Nonvested common stock awards, Ending balance | shares	153,604
Nonvested performance-based stock awards, Beginning balance | $ / shares	$ 47.40
Granted | $ / shares	50.94
Vested | $ / shares	42.27
Forfeited/Cancelled | $ / shares	52.25
Nonvested performance-based stock awards, Ending balance | $ / shares	$ 52.93
Performance Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested performance-based stock awards/units, Beginning balance | shares	115,698
Granted | shares	82,692
Vested | shares	(31,404)
Forfeited/Cancelled | shares	(6,697)
Nonvested performance-based stock awards/units, Ending balance | shares	160,289
Nonvested performance-based stock awards/units, Beginning balance | $ / shares	$ 52.25
Granted | $ / shares	45.65
Vested | $ / shares	41.00
Forfeited/Cancelled | $ / shares	65.60
Nonvested performance-based stock awards/units, Ending balance | $ / shares	$ 50.49
Performance Based Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested performance-based stock awards/units, Beginning balance | shares	13,248
Granted | shares	13,933
Vested | shares	(12,808)
Forfeited/Cancelled | shares	(840)
Nonvested performance-based stock awards/units, Ending balance | shares	13,533
Nonvested performance-based stock awards/units, Beginning balance | $ / shares	$ 56.05
Granted | $ / shares	51.62
Vested | $ / shares	56.05
Forfeited/Cancelled | $ / shares	53.94
Nonvested performance-based stock awards/units, Ending balance | $ / shares	$ 51.62

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 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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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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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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