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Benefit Plans - Target Allocation of Assets and Acceptable Ranges (Detail) - Pension [Member] | Dec. 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 100.00%
Domestic equities [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 37.00%
Foreign equities [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 11.00%
Fixed Income [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 50.00%
Real estate [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 2.00%
Cash [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 0.00%
Minimum [Member] | Domestic equities [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 30.00%
Minimum [Member] | Foreign equities [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 5.00%
Minimum [Member] | Fixed Income [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 40.00%
Minimum [Member] | Real estate [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 0.00%
Minimum [Member] | Cash [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 0.00%
Maximum [Member] | Domestic equities [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 41.00%
Maximum [Member] | Foreign equities [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 13.00%
Maximum [Member] | Fixed Income [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 65.00%
Maximum [Member] | Real estate [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 4.00%
Maximum [Member] | Cash [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Target allocation of assets | 0.00%

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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 Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + 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 (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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