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Postretirement Benefit Plans - Defined Contribution Plan Expenses for Company's Qualified Contribution Plans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution plan expenses | $ 2,797 | $ 2,774 | $ 8,749 | $ 7,862
Retirement Savings Contributions [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution plan expenses | 2,106 | 2,101 | 6,526 | 6,319
Profit Sharing Contributions [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution plan expenses | $ 691 | $ 673 | $ 2,223 | $ 1,543

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 70 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480794/715-70-50-1 + Details
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