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PENSION (Fair Value) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | $ 776,482 | $ 714,608 |
Cash And Cash Equivalents [Member] |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 42,374 | 23,979 |
EquitySecuritiesMember |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 504,633 | 459,002 |
DebtSecuritiesMember |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 216,372 | 219,249 |
Alternative Investments [Member] |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 10,912 | 10,760 |
Other Assets [Member] |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 2,191 | 1,618 |
FairValueInputsLevel1Member |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 617,991 | 578,403 |
FairValueInputsLevel1Member | Cash And Cash Equivalents [Member] |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 12,551 | 4,893 |
FairValueInputsLevel1Member | EquitySecuritiesMember |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 455,175 | 418,390 |
FairValueInputsLevel1Member | DebtSecuritiesMember |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 150,265 | 155,120 |
FairValueInputsLevel2Member |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 145,388 | 123,827 |
FairValueInputsLevel2Member | Cash And Cash Equivalents [Member] |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 29,823 | 19,086 |
FairValueInputsLevel2Member | EquitySecuritiesMember |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 49,458 | 40,612 |
FairValueInputsLevel2Member | DebtSecuritiesMember |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 66,107 | 64,129 |
FairValueInputsLevel3Member |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 13,103 | 12,378 | $ 10,475
FairValueInputsLevel3Member | Alternative Investments [Member] |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 10,912 | 10,760 |
FairValueInputsLevel3Member | Insurance Contracts [Member] |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | 10,912 | 10,760 | 9,720
FairValueInputsLevel3Member | Other Assets [Member] |  |  |
Defined Benefit Plan Fair Value Disclosure [Line Items] |  |  |
DefinedBenefitPlanFairValueOfPlanAssets | $ 2,191 | $ 1,618 | $ 755

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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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