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Retirement Benefit Plans - Employer Contributions, Participant Contributions and Benefit Payments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension Plans
Defined Contribution Plan Disclosure [Line Items]
Employer Contributions	$ 3,758	$ 3,850	$ 3,800
Participant Contributions	0	0	0
Benefits Paid	7,823	8,877	9,724
Retirement Benefits
Defined Contribution Plan Disclosure [Line Items]
Employer Contributions	2,552	2,790	12,153
Participant Contributions	260	234	279
Benefits Paid	2,526	2,767	3,503
Supplemental Employee Retirement Plans, Defined Benefit
Defined Contribution Plan Disclosure [Line Items]
Employer Contributions	679	665	637
Participant Contributions	0	0	0
Benefits Paid	$ 679	$ 665	$ 637

X

- Definition

Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

+ References

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-Topic 715
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-Name Accounting Standards Codification
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- Definition

Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

+ References

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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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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