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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | $ 14,142 | $ 12,030 | $ 11,799
Retirement Contributions [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | 8,035 | 7,328 | 7,617
Profit Sharing Contributions [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | $ 6,107 | $ 4,702 | $ 4,182

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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 http://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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