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Postretirement Benefit Plans - Defined Contribution Expenses for Company's Qualified Defined Contribution Plans and Statutory Profit Sharing Contributions (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | $ 10,353 | $ 10,949 | $ 13,832
Retirement Contributions [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | 8,633 | 8,930 | 8,556
Profit Sharing Contributions [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | $ 1,720 | $ 2,019 | $ 5,276

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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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