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Postretirement Benefit Plans - Defined Contribution Plan Expenses for Company's Qualified Contribution Plans (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Defined Contribution Plan Disclosure [Line Items] |  |
Total defined contribution plan expenses | $ 2,733 | $ 3,291
Retirement Savings Contributions [Member] |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Total defined contribution plan expenses | 1,758 | 2,409
Profit Sharing Contributions [Member] |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Total defined contribution plan expenses | $ 975 | $ 882

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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Balance Type: | debit
Period Type: | duration

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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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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |