Employee Benefits - Summary of Equity-Based Awards for Employees (Detail)	12 Months Ended
Dec. 31, 2023 $ / shares shares
Awards
Share-based awards granted (in shares)	100,000
Common Stock Awards
Awards
Nonvested common stock awards, Beginning balance (in shares)	157,117
Granted (in shares)	81,180
Vested (in shares)	(119,431)
Forfeited/Cancelled (in shares)	(2,384)
Nonvested common stock awards, Ending balance (in shares)	116,482
Weighted Average Grant Date Fair Value Per Share
Nonvested common stock awards, Beginning balance (in USD per share) \| $ / shares	$ 77.31
Granted (in USD per share) \| $ / shares	115.87
Vested (in USD per share) \| $ / shares	78.00
Forfeited/Cancelled (in USD per share) \| $ / shares	99.39
Nonvested common stock awards, Ending balance (in USD per share) \| $ / shares	$ 103.02
Performance-Based Stock Awards
Awards
Nonvested performance-based stock awards/units, Beginning balance (in shares)	126,053
Share-based awards granted (in shares)	73,400
Vested (in shares)	(50,994)
Forfeited/Cancelled (in shares)	0
Nonvested performance-based stock awards/units, Ending balance (in shares)	148,459
Weighted Average Grant Date Fair Value Per Share
Nonvested performance-based stock awards/units, Beginning balance (in USD per share) \| $ / shares	$ 103.37
Granted (in USD per share) \| $ / shares	109.13
Vested (in USD per share) \| $ / shares	95.78
Forfeited/Cancelled (in USD per share) \| $ / shares	0
Nonvested performance-based stock awards/units, Ending balance (in USD per share) \| $ / shares	$ 108.83
Performance-Based Restricted Stock Units
Awards
Nonvested performance-based stock awards/units, Beginning balance (in shares)	15,711
Share-based awards granted (in shares)	14,730
Vested (in shares)	(15,518)
Forfeited/Cancelled (in shares)	(541)
Nonvested performance-based stock awards/units, Ending balance (in shares)	14,382
Weighted Average Grant Date Fair Value Per Share
Nonvested performance-based stock awards/units, Beginning balance (in USD per share) \| $ / shares	$ 80.55
Granted (in USD per share) \| $ / shares	111.84
Vested (in USD per share) \| $ / shares	80.76
Forfeited/Cancelled (in USD per share) \| $ / shares	97.89
Nonvested performance-based stock awards/units, Ending balance (in USD per share) \| $ / shares	$ 111.71

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

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Number of non-vested options outstanding.

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Number of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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Number of options vested.

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Weighted average grant-date fair value of options vested.

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