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v2.4.1.9

Long-Term Debt (Schedule of Long-Term Debt) (Details) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument [Line Items] |  |
Long-term Debt | $ 716,700,000 us-gaap_LongTermDebt | $ 749,150,000 us-gaap_LongTermDebt
Senior Notes Series A Due February Twenty Seven Two Thousand Twenty [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | 150,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = kex_SeniorNotesSeriesDueFebruaryTwentySevenTwoThousandTwentyMember | 150,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = kex_SeniorNotesSeriesDueFebruaryTwentySevenTwoThousandTwentyMember
Credit facility, expiration date | Feb. 27, 2020 |
Long term debt, face amount | 150,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = kex_SeniorNotesSeriesDueFebruaryTwentySevenTwoThousandTwentyMember |
Senior Notes Series B Due February Twenty Seven Two Thousand Twenty Three [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | 350,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = kex_SeniorNotesSeriesBDueFebruaryTwentySevenTwoThousandTwentyThreeMember | 350,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = kex_SeniorNotesSeriesBDueFebruaryTwentySevenTwoThousandTwentyThreeMember
Credit facility, expiration date | Feb. 27, 2023 |
Long term debt, face amount | 350,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = kex_SeniorNotesSeriesBDueFebruaryTwentySevenTwoThousandTwentyThreeMember |
Credit Line Due June Twenty Nine Two Thousand Fifteen [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | 0 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = kex_CreditLineDueJuneTwentyNineTwoThousandFifteenMember | 0 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = kex_CreditLineDueJuneTwentyNineTwoThousandFifteenMember
Credit facility, expiration date | Jun. 29, 2015 |
Long term debt, face amount | 10,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = kex_CreditLineDueJuneTwentyNineTwoThousandFifteenMember |
Term Loan Due July 1, 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | 100,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = kex_TermLoanDueMayThirtyFirstTwoThousandSixteenMember | 208,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = kex_TermLoanDueMayThirtyFirstTwoThousandSixteenMember
Credit facility, expiration date | Jul. 01, 2016 |
Long term debt, face amount | 540,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = kex_TermLoanDueMayThirtyFirstTwoThousandSixteenMember |
Revolving Credit Facility Due November 9, 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | 116,700,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = kex_RevolvingCreditFacilityDueNovemberNineThousandFifteenMember | 41,150,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = kex_RevolvingCreditFacilityDueNovemberNineThousandFifteenMember
Credit facility, expiration date | Nov. 09, 2015 |
Long term debt, face amount | 325,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LineOfCreditFacilityAxis = kex_RevolvingCreditFacilityDueNovemberNineThousandFifteenMember |
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | $ 4,939,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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