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Retirement Plans - Information Pertaining to Activity in Supplemental Retirement Plans (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Change in benefit obligation: |  |  |
Benefit obligation at beginning of year | $ (40,341) | $ (43,834) |
Acquisition of obligations | 0 | (3,310) |
Service cost | (138) | (1,624) | $ (1,103)
Interest cost | (2,016) | (1,731) | (1,518)
Actuarial (loss)/gain | 81 | 10,266 |
Plan amendments | 0 | (2,141) |
Benefits paid | 3,769 | 2,033 |
Benefit obligation at end of year | (38,645) | (40,341) | $ (43,834)
Change in plan assets: |  |  |
Fair value of plan assets at beginning of year | 0 |  |
Fair value of plan assets at end of year | 0 | 0 |
Funded status | (38,645) | (40,341) |
Unrecognized net obligation existing at January 1, 1986 | 0 | 0 |
Unrecognized net actuarial (loss)/gain | (13,527) | (13,901) |
Unrecognized prior service cost | 0 | 0 |
Accumulated other comprehensive loss | 13,527 | 13,901 |
Accrued benefit cost | (38,645) | (40,341) |
Accumulated benefit obligation | $ (38,645) | $ (40,341) |

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- Definition Defined benefit plan net actuarial gains losses not yet recognized. + References No definition available. + Details
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- Definition Defined benefit plan net prior service costs credits not yet recognized. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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