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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | $ 10,949 | $ 13,832 | $ 13,215
Retirement Contributions [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | 8,930 | 8,556 | 8,134
Profit Sharing Contributions [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | $ 2,019 | $ 5,276 | $ 5,081

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