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SEGMENT DATA (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 Segment | Mar. 31, 2014 | Dec. 31, 2014
SEGMENT DATA [Abstract] |  |  |
Number of Reportable Segments | 2 us-gaap_NumberOfReportableSegments |  |
Revenues [Abstract] |  |  |
Marine transportation | $ 419,905 us-gaap_CargoAndFreightRevenue | $ 435,771 us-gaap_CargoAndFreightRevenue |
Diesel engine services | 167,768 kex_RevenueRepairAndSaleOfDieselEngineAndRelatedParts | 153,475 kex_RevenueRepairAndSaleOfDieselEngineAndRelatedParts |
Total revenues | 587,673 us-gaap_Revenues | 589,246 us-gaap_Revenues |
Segment profit (loss) | 97,902 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 101,000 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Total assets | 4,151,894 us-gaap_Assets |  | 4,141,909 us-gaap_Assets
Other segment disclosures [Abstract] |  |  |
Gain on disposition of assets | 1,555 us-gaap_GainLossOnDispositionOfAssets | 51 us-gaap_GainLossOnDispositionOfAssets |
Interest expense | (5,250)us-gaap_InterestExpense | (5,618)us-gaap_InterestExpense |
Other income (expense) | 60 us-gaap_NonoperatingIncomeExpense | (236)us-gaap_NonoperatingIncomeExpense |
Details of "Other" total assets [Abstract] |  |  |
Total assets | 4,151,894 us-gaap_Assets |  | 4,141,909 us-gaap_Assets
Marine transportation [Member] |  |  |
Revenues [Abstract] |  |  |
Segment profit (loss) | 96,269 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = kex_MarineTransportationMember | 97,551 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = kex_MarineTransportationMember |
Total assets | 3,386,629 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = kex_MarineTransportationMember |  | 3,317,696 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = kex_MarineTransportationMember
Details of "Other" total assets [Abstract] |  |  |
Total assets | 3,386,629 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = kex_MarineTransportationMember |  | 3,317,696 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = kex_MarineTransportationMember
Diesel engine services [Member] |  |  |
Revenues [Abstract] |  |  |
Segment profit (loss) | 8,843 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = kex_DieselEngineServicesMember | 12,772 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = kex_DieselEngineServicesMember |
Total assets | 713,903 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = kex_DieselEngineServicesMember |  | 736,129 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = kex_DieselEngineServicesMember
Details of "Other" total assets [Abstract] |  |  |
Total assets | 713,903 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = kex_DieselEngineServicesMember |  | 736,129 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = kex_DieselEngineServicesMember
Other [Member] |  |  |
Revenues [Abstract] |  |  |
Segment profit (loss) | (7,210)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (9,323)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Total assets | 51,362 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 88,084 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Other segment disclosures [Abstract] |  |  |
General corporate expenses | (3,575)kex_GeneralCorporateExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (3,520)kex_GeneralCorporateExpenses / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Gain on disposition of assets | 1,555 us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | 51 us-gaap_GainLossOnDispositionOfAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Interest expense | (5,250)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (5,618)us-gaap_InterestExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Other income (expense) | 60 us-gaap_NonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (236)us-gaap_NonoperatingIncomeExpense / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Profit (loss) from other segment | (7,210)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | (9,323)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |
Details of "Other" total assets [Abstract] |  |  |
General corporate assets | 48,687 kex_GeneralCorporateAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 85,545 kex_GeneralCorporateAssets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Investment in affiliates | 2,675 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | 2,539 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember
Total assets | $ 51,362 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember |  | $ 88,084 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember

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- Definition Overhaul and repair of medium-speed and high-speed diesel engines, reduction gear repair, and sale of related parts and accessories for customers in the marine, power generation and railroad industries. + References No definition available. + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Revenue from transporting cargo and freight between locations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2941-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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