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PENSION (Asset Class) (Detail) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanTargetPlanAssetAllocations | 15.00% |
Domestic Equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanWeightedAverageAssetAllocations | 52.00% | 54.00%
DefinedBenefitPlanTargetPlanAssetAllocations | 50.00% |
International Equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanWeightedAverageAssetAllocations | 15.00% | 13.00%
EquitySecuritiesMember |  |
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanWeightedAverageAssetAllocations | 67.00% | 67.00%
DefinedBenefitPlanTargetPlanAssetAllocations | 65.00% |
FixedIncomeFundsMember |  |
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanWeightedAverageAssetAllocations | 33.00% | 33.00%
DefinedBenefitPlanTargetPlanAssetAllocations | 35.00% |
Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanTargetPlanAssetAllocations | 10.00% |
Minimum [Member] | Domestic Equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanTargetPlanAssetAllocations | 40.00% |
Minimum [Member] | EquitySecuritiesMember |  |
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanTargetPlanAssetAllocations | 55.00% |
Minimum [Member] | FixedIncomeFundsMember |  |
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanTargetPlanAssetAllocations | 25.00% |
Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanTargetPlanAssetAllocations | 20.00% |
Maximum [Member] | Domestic Equities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanTargetPlanAssetAllocations | 60.00% |
Maximum [Member] | EquitySecuritiesMember |  |
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanTargetPlanAssetAllocations | 75.00% |
Maximum [Member] | FixedIncomeFundsMember |  |
Defined Benefit Plan Disclosure [Line Items] |  |
DefinedBenefitPlanTargetPlanAssetAllocations | 45.00% |

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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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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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