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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 | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Defined Contribution Plan Disclosure [Line Items] |  |
Total defined contribution expense | $ 3,102 | $ 3,008
Retirement Savings Plans [Member] |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Total defined contribution expense | 1,259 | 1,291
Profit Sharing Plan [Member] |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Total defined contribution expense | $ 1,843 | $ 1,717

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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Period Type: |

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- Details
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Balance Type: |
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