Defined benefit plan number of common shares sold to ESOP trust.

No definition available.

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- Definition

Preceding year asset gain or loss considered to calculate expected return on plan assets.

+ References

No definition available.

+ Details

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- Definition

Defined benefit plan percentage of preceding year asset gain or loss considered to calculate expected return on plan assets.

+ References

No definition available.

+ Details

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- Definition

Defined benefit plan percentage of second preceding year asset gain or loss considered to calculate expected return on plan assets.

+ References

No definition available.

+ Details

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- Definition

Preceding year asset gain or loss considered to calculate expected return on plan assets.

+ References

No definition available.

+ Details

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- Definition

Defined benefit plan assets target allocation percentage including stock.

+ References

No definition available.

+ Details

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- Definition

Amount of employer's best estimate of payments expected to be paid out of operating cash to plan participants during the next fiscal year beginning after the date of the latest statement of financial position.

+ References

No definition available.

+ Details

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- Definition

Percentage of expected long term rate of return on plan assets.

+ References

No definition available.

+ Details

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- Definition

Percentage of long term return in cash.

+ References

No definition available.

+ Details

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- Definition

Percentage of premium estimated return for equities and properties to risk free rate.

+ References

No definition available.

+ Details

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-8

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-18

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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Postretirement Benefit Plans - Defined Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 15, 2023	Feb. 17, 2022	Feb. 24, 2021
Defined Benefit Plan Disclosure [Line Items]
Assets gains or losses added for prior year	80.00%
Assets gains or losses added for second preceding year	60.00%
Assets gains or losses added for third preceding year	40.00%
Assets gains or losses added for fourth preceding year	20.00%
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Common shares sold to the Company's ESOP trust				38,542	33,983	31,362
Expected long-term rate of return on assets	5.50%	5.50%	6.75%
Expected payment related to qualified plan	$ 0
Expected payment related to non-qualified plan	$ 308,000
U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	4.47%	1.61%	1.13%
Percentage of premium estimated return for equities and properties to risk free rate	3.00%
Percentage of long term return in cash	5.25%
Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	13.00%
Percentage of target allocation for investment including stock category	20.00%
Expected long-term rate of return on assets	9.57%
Equities [Member] \| U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	6.00%
Real Estate [Member] \| U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	1.00%
Bonds [Member] \| U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	80.00%
Debt Securities [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	78.00%
Cash [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	2.00%
Cash [Member] \| U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	8.00%
Insurance Contracts [Member] \| U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	5.00%
U.S. and international equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	5.35%