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Benefit Plans - Summary of Common/Collective Trust Fund Pension Plan Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Jan. 01, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Total common/collective trust funds | $ 257,790 | $ 227,549
Common/Collective Trust Funds - Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total common/collective trust funds | 157,290 | 139,735
Common/Collective Trust Funds - Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total common/collective trust funds | $ 100,500 | $ 87,814

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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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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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