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Taxes on Income (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current deferred tax assets [Abstract]    
Compensated absences $ 854us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences $ 782us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences
Allowance for doubtful accounts 3,111us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 1,927us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Insurance accruals 2,858us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance 2,572us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance
Other 3,739us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 4,177us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Current deferred tax assets, Total 10,562us-gaap_DeferredTaxAssetsNetCurrent 9,458us-gaap_DeferredTaxAssetsNetCurrent
Deferred tax assets [Abstract]    
Postretirement health care benefits 2,795us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 3,015us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Insurance accruals 3,325kex_DeferredTaxAssetsTaxDeferredExpenseOfNonCurrentInsuranceAccruals 2,781kex_DeferredTaxAssetsTaxDeferredExpenseOfNonCurrentInsuranceAccruals
Deferred compensation 10,157us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 9,526us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Unrealized loss on derivative financial instruments 0us-gaap_DeferredTaxAssetsDerivativeInstruments 51us-gaap_DeferredTaxAssetsDerivativeInstruments
Unrealized loss on defined benefit plans 34,501kex_DeferredTaxAssetsTaxDeferredExpenseOfNonCurrentUnrealizedLossOnDefinedBenefitPlans 9,379kex_DeferredTaxAssetsTaxDeferredExpenseOfNonCurrentUnrealizedLossOnDefinedBenefitPlans
Operating loss carryforwards 515us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 5,699us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other 20,687us-gaap_DeferredTaxAssetsOther 17,925us-gaap_DeferredTaxAssetsOther
Deferred tax assets 71,980us-gaap_DeferredTaxAssetsNetNoncurrent 48,376us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred tax liabilities [Abstract]    
Property (547,388)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (487,187)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred state taxes (49,503)kex_DeferredTaxLiabilitiesStateTaxes (46,798)kex_DeferredTaxLiabilitiesStateTaxes
Pension benefits (11,198)kex_DeferredTaxLiabilitiesPensionBenefits (13,063)kex_DeferredTaxLiabilitiesPensionBenefits
Goodwill and other intangibles (37,936)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets (26,120)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Other (21,724)us-gaap_DeferredTaxLiabilitiesOther (19,318)us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liabilities (667,749)us-gaap_DeferredTaxLiabilities (592,486)us-gaap_DeferredTaxLiabilities
Deferred tax assets (liabilities) $ (595,769)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (544,110)us-gaap_DeferredTaxAssetsLiabilitiesNet