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Employee Benefits - Summary of Equity-Based Awards for Employees (Detail)	3 Months Ended
	Mar. 31, 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	10,800
Vested | shares	(564)
Forfeited/Cancelled | shares	(445)
Nonvested common stock awards, Ending balance | shares	182,980
Nonvested performance-based stock awards, Beginning balance | $ / shares	$ 47.40
Granted | $ / shares	45.65
Vested | $ / shares	54.98
Forfeited/Cancelled | $ / shares	56.05
Nonvested performance-based stock awards, Ending balance | $ / shares	$ 47.25
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
Forfeited/Cancelled | shares	(6,697)
Nonvested performance-based stock awards/units, Ending balance | shares	191,693
Nonvested performance-based stock awards/units, Beginning balance | $ / shares	$ 52.25
Granted | $ / shares	45.65
Forfeited/Cancelled | $ / shares	65.60
Nonvested performance-based stock awards/units, Ending balance | $ / shares	$ 48.93
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
Forfeited/Cancelled | shares	(440)
Nonvested performance-based stock awards/units, Ending balance | shares	12,808
Nonvested performance-based stock awards/units, Beginning balance | $ / shares	$ 56.05
Forfeited/Cancelled | $ / shares	56.05
Nonvested performance-based stock awards/units, Ending balance | $ / shares	$ 56.05

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=109197908&loc=d3e5070-113901

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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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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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Gross number of share options (or share units) granted during the period.

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