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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, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution plan expenses | $ 3,756 | $ 3,431 | $ 11,326 | $ 11,179
Retirement Savings Contributions [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution plan expenses | 1,897 | 2,055 | 6,042 | 6,072
Profit Sharing Contributions [Member] |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |
Total defined contribution plan expenses | $ 1,859 | $ 1,376 | $ 5,284 | $ 5,107

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + 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 No definition available. + Details
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- Details
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- Details
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