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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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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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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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Number of non-vested options outstanding.

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No definition available.

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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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No definition available.

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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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Employee Benefits - Summary of Equity-Based Awards for Employees (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Awards
Share-based awards granted (in shares)	100,000	100,000	200,000
Common Stock Awards
Awards
Nonvested common stock awards, Beginning balance (in shares)	199,353
Granted (in shares)	109,189
Vested (in shares)	(149,504)
Forfeited/Cancelled (in shares)	(1,921)
Nonvested common stock awards, Ending balance (in shares)	157,117	199,353
Weighted Average Grant Date Fair Value Per Share
Nonvested common stock awards, Beginning balance (in USD per share)	$ 68.99
Granted (in USD per share)	89.32
Vested (in USD per share)	74.96
Forfeited/Cancelled (in USD per share)	79.60
Nonvested common stock awards, Ending balance (in USD per share)	$ 77.31	$ 68.99
Performance-Based Stock Awards
Awards
Nonvested performance-based stock awards/units, Beginning balance (in shares)	143,401
Share-based awards granted (in shares)	54,585
Vested (in shares)	(71,933)
Forfeited/Cancelled (in shares)	0
Nonvested performance-based stock awards/units, Ending balance (in shares)	126,053	143,401
Weighted Average Grant Date Fair Value Per Share
Nonvested performance-based stock awards/units, Beginning balance (in USD per share)	$ 81.30
Granted (in USD per share)	102.98
Vested (in USD per share)	59.07
Forfeited/Cancelled (in USD per share)	0
Nonvested performance-based stock awards/units, Ending balance (in USD per share)	$ 103.37	$ 81.30
Performance-Based Restricted Stock Units
Awards
Nonvested performance-based stock awards/units, Beginning balance (in shares)	8,252
Share-based awards granted (in shares)	16,618
Vested (in shares)	(8,061)
Forfeited/Cancelled (in shares)	(1,098)
Nonvested performance-based stock awards/units, Ending balance (in shares)	15,711	8,252
Weighted Average Grant Date Fair Value Per Share
Nonvested performance-based stock awards/units, Beginning balance (in USD per share)	$ 126.89
Granted (in USD per share)	80.55
Vested (in USD per share)	126.89
Forfeited/Cancelled (in USD per share)	88.61
Nonvested performance-based stock awards/units, Ending balance (in USD per share)	$ 80.55	$ 126.89