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v2.4.1.9

Long-Term Debt, Narrative (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |
Senior Notes | $ 500,000,000 us-gaap_SeniorNotes |  |
Additional notes issued | 0 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 225,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 275,000,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Current portion of long-term debt | 116,700,000 us-gaap_LongTermDebtCurrent | 0 us-gaap_LongTermDebtCurrent |
Total debt outstanding, Fair value | 705,215,000 us-gaap_DebtInstrumentFairValue | 710,377,000 us-gaap_DebtInstrumentFairValue |
Commitment fee (in hundredths) | 0.30%us-gaap_LineOfCreditFacilityCommitmentFeePercentage |  |
Senior Notes Series A Due February 27, 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate, stated percentage (in hundredths) | 2.72%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LineOfCreditFacilityAxis = kex_SeniorNotesSeriesDueFebruaryTwentySevenTwoThousandTwentyMember |  |
Additional notes issued | 67,500,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_LineOfCreditFacilityAxis = kex_SeniorNotesSeriesDueFebruaryTwentySevenTwoThousandTwentyMember |  |
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 |
Senior debt retired | 82,500,000 us-gaap_SeniorLongTermNotes / us-gaap_LineOfCreditFacilityAxis = kex_SeniorNotesSeriesDueFebruaryTwentySevenTwoThousandTwentyMember |  |
Senior Notes Series B Due February 27, 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate, stated percentage (in hundredths) | 3.29%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LineOfCreditFacilityAxis = kex_SeniorNotesSeriesBDueFebruaryTwentySevenTwoThousandTwentyThreeMember |  |
Additional notes issued | 157,500,000 us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_LineOfCreditFacilityAxis = kex_SeniorNotesSeriesBDueFebruaryTwentySevenTwoThousandTwentyThreeMember |  |
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 |
Senior debt retired | 192,500,000 us-gaap_SeniorLongTermNotes / us-gaap_LineOfCreditFacilityAxis = kex_SeniorNotesSeriesBDueFebruaryTwentySevenTwoThousandTwentyThreeMember |  |
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 |
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 |
Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date | Jul. 01, 2016 |  |
Average borrowing under revolving credit facility | 152,892,000 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_LineOfCreditFacilityAxis = kex_TermLoanMember |  |
Senior debt retired | 100,000,000 us-gaap_SeniorLongTermNotes / us-gaap_LineOfCreditFacilityAxis = kex_TermLoanMember |  |
Current portion of long-term debt | 0 us-gaap_LongTermDebtCurrent / us-gaap_LineOfCreditFacilityAxis = kex_TermLoanMember |  |
Term loan, duration | 5 years |  |
Weighted average interest rate (in hundredths) | 1.70%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LineOfCreditFacilityAxis = kex_TermLoanMember |  |
Term Loan [Member] | LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, variable rate basis | LIBOR |  |
Basis spread on variable rate (in hundredths) | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LineOfCreditFacilityAxis = kex_TermLoanMember / kex_ReferenceRateAxis = kex_LiborMember |  |
Term Loan [Member] | Alternate Base Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, variable rate basis | Alternate Base Rate |  |
Basis spread on variable rate (in hundredths) | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LineOfCreditFacilityAxis = kex_TermLoanMember / kex_ReferenceRateAxis = kex_AlternateBaseRateMember |  |
Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Senior debt retired |  |  | 200,000,000 us-gaap_SeniorLongTermNotes / us-gaap_LineOfCreditFacilityAxis = us-gaap_SeniorNotesMember
Revolving Credit Facility [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date | Nov. 09, 2015 |  |
Average borrowing under revolving credit facility | 28,591,000 us-gaap_LineOfCreditFacilityAverageOutstandingAmount / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Commitment amount | 25,000,000 us-gaap_LineOfCreditFacilityCommitmentFeeAmount / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Credit facility, amount outstanding | 4,939,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Weighted average interest rate (in hundredths) | 1.70%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |  |
Revolving Credit Facility [Member] | LIBOR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, variable rate basis | LIBOR |  |
Basis spread on variable rate (in hundredths) | 1.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / kex_ReferenceRateAxis = kex_LiborMember |  |
Revolving Credit Facility [Member] | Alternate Base Rate [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, variable rate basis | Alternate Base Rate |  |
Basis spread on variable rate (in hundredths) | 0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_LineOfCreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / kex_ReferenceRateAxis = kex_AlternateBaseRateMember |  |
Line Of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, amount outstanding | $ 1,194,000 us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_LongtermDebtTypeAxis = us-gaap_LineOfCreditMember |  |

X
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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- Definition Amount of the fee for available but unused credit capacity under the credit facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. 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 FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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- Definition Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 + Details
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