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Postretirement Benefit Plans - Defined Contribution Plan Expenses for the Company's Retirement Savings Plans and Profit Sharing Plan (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | $ 11,799 | $ 12,000 | $ 11,132
Retirement Contributions [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | 7,617 | 4,998 | 4,902
Profit Sharing Contributions [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Total defined contribution expense | $ 4,182 | $ 7,002 | $ 6,230

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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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- 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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Period Type: |

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- Details
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