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v2.4.1.9

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 | $ 0 kex_PaymentOfContingentLiability |  |  |  |
Allied Transportation Company [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Earnout Provision |  |  |  |  |  | 10,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember |
Fair value contingent earnout liability | 0 kex_ContingentEarnoutLiabilityFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember |  |  |  |  | 9,756,000 kex_ContingentEarnoutLiabilityFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember |
Increase (decrease) in fair value of earnout liability | 97,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember | 136,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember |  |  |  |  |
Payment of contingent liability |  |  |  | 5,000,000 kex_PaymentOfContingentLiability / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember | 5,000,000 kex_PaymentOfContingentLiability / us-gaap_BusinessAcquisitionAxis = kex_AlliedTransportationCompanyMember |  |
United Holdings LLC [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Earnout Provision |  |  |  |  |  |  | 50,000,000 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_BusinessAcquisitionAxis = kex_UnitedHoldingsLlcMember
Fair value contingent earnout liability |  | 18,300,000 kex_ContingentEarnoutLiabilityFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = kex_UnitedHoldingsLlcMember |  |  |  |  | 16,300,000 kex_ContingentEarnoutLiabilityFairValueAtAcquisition / us-gaap_BusinessAcquisitionAxis = kex_UnitedHoldingsLlcMember
Increase (decrease) in fair value of earnout liability | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = kex_UnitedHoldingsLlcMember | 0 us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 / us-gaap_BusinessAcquisitionAxis = kex_UnitedHoldingsLlcMember |  |  |  |  |
Recurring [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivatives |  | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivatives |  | 59,000 us-gaap_DerivativeLiabilities / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Contingent liabilities |  | 4,903,000 kex_ContingentEarnoutLiability / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Liabilities fair value |  | 4,962,000 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Recurring [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivatives |  | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivatives |  | 0 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Contingent liabilities |  | 0 kex_ContingentEarnoutLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Liabilities fair value |  | 0 us-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 |  | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivatives |  | 59,000 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Contingent liabilities |  | 0 kex_ContingentEarnoutLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Liabilities fair value |  | 59,000 us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Significant Unobservable Inputs (Level 3) | Recurring [Member] |  |  |  |  |  |  |
Assets [Abstract] |  |  |  |  |  |  |
Derivatives |  | 0 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |
Derivatives |  | 0 us-gaap_DerivativeLiabilities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Contingent liabilities |  | 4,903,000 kex_ContingentEarnoutLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember |  |  |  |  |
Liabilities fair value |  | $ 4,903,000 us-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. + Details
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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. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e7008-128479 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226000-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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