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Employer Contributions, Participant Contributions and Benefit Payments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plans |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer Contributions | $ 3,850 | $ 3,800 | $ 4,100
Benefits Paid | 8,877 | 9,724 | 6,489
Other Postretirement Benefit Plans, Defined Benefit |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer Contributions | 2,790 | 12,153 | 8,903
Participant Contributions | 234 | 279 | 220
Benefits Paid | 2,767 | 3,503 | 2,905
Supplemental Employee Retirement Plans, Defined Benefit |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer Contributions | 665 | 637 | 637
Benefits Paid | $ 665 | $ 637 | $ 637

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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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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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