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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution plan expenses | $ 2,774 | $ 3,756 | $ 7,862 | $ 11,326
Retirement Savings Contributions [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution plan expenses | 2,101 | 1,897 | 6,319 | 6,042
Profit Sharing Contributions [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution plan expenses | $ 673 | $ 1,859 | $ 1,543 | $ 5,284

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