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Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Significant Accounting Policies [Line Items] |  |  |
Limited partnership ownership (in hundredths) | 50.00%us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest |  |
Accruals for revenues earned included in accounts receivable | $ 143,615,000 kex_AccrualsForRevenuesEarnedIncludedInAccountsReceivable | $ 69,481,000 kex_AccrualsForRevenuesEarnedIncludedInAccountsReceivable |
Period in which recertification of ocean going vessels occur twice | 5 years |  |
Receivables from insurance companies to cover claims in excess included in accounts receivable | 92,379,000 kex_ReceivablesFromInsuranceCompaniesToCoverClaimsInExcessIncludedInAccountsReceivable | 22,396,000 kex_ReceivablesFromInsuranceCompaniesToCoverClaimsInExcessIncludedInAccountsReceivable |
Interest Expense Excludes Capitalized Interest | 639,000 kex_InterestExpenseExcludesCapitalizedInterest |  |
Interest amount capitalized |  | 0 us-gaap_InterestCostsCapitalized | 0 us-gaap_InterestCostsCapitalized
Impairment of goodwill | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss |
Gross carrying value of goodwill | 608,872,000 us-gaap_GoodwillGross | 608,872,000 us-gaap_GoodwillGross |
Accumulated amortization | 15,566,000 kex_AccumulatedAmortizationOfGoodwill | 15,566,000 kex_AccumulatedAmortizationOfGoodwill |
Accumulated impairment losses | 1,901,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss | 1,901,000 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |
Net goodwill | 591,405,000 us-gaap_Goodwill | 591,405,000 us-gaap_Goodwill |
Amortization of scheduled major maintenance costs | 16,409,000 us-gaap_OtherNoncashIncomeExpense | 9,029,000 us-gaap_OtherNoncashIncomeExpense | 3,924,000 us-gaap_OtherNoncashIncomeExpense
Accrued insurance liabilities | 25,416,000 us-gaap_AccruedInsuranceCurrentAndNoncurrent | 22,971,000 us-gaap_AccruedInsuranceCurrentAndNoncurrent | 17,876,000 us-gaap_AccruedInsuranceCurrentAndNoncurrent
Minimum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Other investments ownership percentage (in hundredths) | 20.00%kex_OtherInvestmentsRelatedToOperatingAndFinancialPoliciesOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Period of amortization of shipyard costs | 30 months |  |
Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Other investments ownership percentage (in hundredths) | 50.00%kex_OtherInvestmentsRelatedToOperatingAndFinancialPoliciesOwnershipPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Period of amortization of shipyard costs | 60 months |  |
Buildings [Member] | Minimum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the individual assets | 10 years |  |
Buildings [Member] | Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the individual assets | 40 years |  |
Other Equipment [Member] | Minimum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the individual assets | 2 years |  |
Other Equipment [Member] | Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the individual assets | 10 years |  |
Marine Transportation Equipment [Member] | Minimum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the individual assets | 5 years |  |
Marine Transportation Equipment [Member] | Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of the individual assets | 40 years |  |
Marine Transportation Segment [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Net goodwill | 381,243,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kex_MarineTransportationSegmentMember | 381,243,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kex_MarineTransportationSegmentMember |
Range of term contracts | 1 year |  |
Marine Transportation Segment [Member] | Minimum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Range of term contracts | 1 year |  |
Marine Transportation Segment [Member] | Maximum [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Range of term contracts | 5 years |  |
Diesel Engine Services Segment [Member] |  |  |
Significant Accounting Policies [Line Items] |  |  |
Net goodwill | $ 210,162,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kex_DieselEngineServicesSegmentMember | $ 210,162,000 us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = kex_DieselEngineServicesSegmentMember |

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