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Postretirement Benefit Plans - Defined Contribution Plan Expenses for Company's Qualified Contribution Plans (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution plan expenses | $ 3,517 | $ 2,839 | $ 6,322 | $ 6,164
Retirement Savings Contributions [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution plan expenses | 2,410 | 2,344 | 4,654 | 4,559
Profit Sharing Contributions [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution plan expenses | $ 1,107 | $ 495 | $ 1,668 | $ 1,605

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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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