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

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

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

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

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Defined benefit plan assets target allocation percentage including stock.

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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.

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Expected payment related to qualified plan in next fiscal year.

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Payment related to nonqualified plan in current fiscal year.

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Payment related to qualified plan in current fiscal year.

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

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Percentage of long term return in cash.

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

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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.

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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.

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Postretirement Benefit Plans - Defined Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Feb. 22, 2024	Feb. 15, 2023
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	25,577			14,439	38,542
Expected long-term rate of return on assets	5.50%	5.50%	5.50%
Payment related to qualified plan, 2025	$ 0
Payment related to non-qualified plan, 2025	170,000
Expected payment related to qualified plan	910,000
Expected payment related to non-qualified plan	$ 145,000
U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	5.55%	4.64%	4.47%
Percentage of premium estimated return for equities and properties to risk free rate	1.80%
Percentage of long term return in cash	3.80%
Duration-matching Bonds [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	81.00%
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	8.86%
Equities [Member] \| U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	13.00%
Equity [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	16.00%
Money Market Funds [Member] \| United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	3.00%
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	75.00%
Fixed Income [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	7.00%
Insurance Contracts [Member] \| U.K Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of target allocation for investment category	4.00%
U.S. and international equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on assets	5.24%