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Employee Benefits - Summary of Equity-Based Awards for Employees (Detail)	12 Months Ended
	Dec. 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	88,529
Vested | shares	(106,660)
Forfeited/Cancelled | shares	(2,176)
Nonvested common stock awards, Ending balance | shares	152,882
Nonvested performance-based stock awards, Beginning balance | $ / shares	$ 47.40
Granted | $ / shares	50.94
Vested | $ / shares	42.30
Forfeited/Cancelled | $ / shares	52.13
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	(1,187)
Nonvested performance-based stock awards/units, Ending balance | shares	13,186
Nonvested performance-based stock awards/units, Beginning balance | $ / shares	$ 56.05
Granted | $ / shares	51.62
Vested | $ / shares	56.05
Forfeited/Cancelled | $ / shares	53.26
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.

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-SubTopic 10
-Section 50
-Paragraph 2
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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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