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Fair Value Measurements (Details) (USD $)	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014	Mar. 31, 2013	Nov. 01, 2012	Apr. 15, 2011
Business Acquisition [Line Items]
Payment of contingent liability	$ (4,756,000)kex_PaymentOfContingentLiability	$ (5,000,000)kex_PaymentOfContingentLiability	$ 0kex_PaymentOfContingentLiability
Allied Transportation Company [Member]
Business Acquisition [Line Items]
Earnout Provision						10,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember
Fair value contingent earnout liability	0kex_ContingentEarnoutLiabilityFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember					9,756,000kex_ContingentEarnoutLiabilityFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember
Increase (decrease) in fair value of earnout liability	97,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember	136,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember
Payment of contingent liability				5,000,000kex_PaymentOfContingentLiability / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember	5,000,000kex_PaymentOfContingentLiability / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember
United Holdings LLC [Member]
Business Acquisition [Line Items]
Earnout Provision							50,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = kex_UnitedHoldingsLlcMember
Fair value contingent earnout liability		18,300,000kex_ContingentEarnoutLiabilityFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = kex_UnitedHoldingsLlcMember					16,300,000kex_ContingentEarnoutLiabilityFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = kex_UnitedHoldingsLlcMember
Increase (decrease) in fair value of earnout liability	0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = kex_UnitedHoldingsLlcMember	0us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = kex_UnitedHoldingsLlcMember
Recurring [Member]
Assets [Abstract]
Derivatives		0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Liabilities [Abstract]
Derivatives		59,000us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Contingent liabilities		4,903,000kex_ContingentEarnoutLiability / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Liabilities fair value		4,962,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Quoted Prices In Active Markets For Identical Assets (Level 1) | Recurring [Member]
Assets [Abstract]
Derivatives		0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Liabilities [Abstract]
Derivatives		0us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Contingent liabilities		0kex_ContingentEarnoutLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Liabilities fair value		0us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Significant Other Observable Inputs (Level 2) | Recurring [Member]
Assets [Abstract]
Derivatives		0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Liabilities [Abstract]
Derivatives		59,000us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Contingent liabilities		0kex_ContingentEarnoutLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Liabilities fair value		59,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Significant Unobservable Inputs (Level 3) | Recurring [Member]
Assets [Abstract]
Derivatives		0us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Liabilities [Abstract]
Derivatives		0us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Contingent liabilities		4,903,000kex_ContingentEarnoutLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Liabilities fair value		$ 4,903,000us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember

X

- Definition

Refers to the entity buys another entity, it may choose to structure the transaction to provide potential future payments to the sellers for achieving certain agreed-upon financial targets.

+ References

No definition available.

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- Definition

Element represents the portion of the balance sheet assertion valued at fair value by the entity for a contingent earnout liability as of the date of acquisition.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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- Definition

Fair value before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value of financial and nonfinancial obligations.

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