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Retirement Plans (Narrative) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected long-term rate of return on plan assets (in hundredths) | 7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets | 7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets |
Contribution percentage to defined contribution plan (in hundredths) | 100.00%kex_DefinedContributionPlanContributionPercentage |  |
Pension plan defined benefit plan cost increase limit percentage (in hundredths) | 4.00%kex_PensionPlanDefinedBenefitPlanCostIncreaseLimitPercentage |  |
Aggregate contributions to the plans | $ 23,356,000 us-gaap_DefinedContributionPlanCostRecognized | $ 23,158,000 us-gaap_DefinedContributionPlanCostRecognized | $ 22,427,000 us-gaap_DefinedContributionPlanCostRecognized
Seafarers Pension Trust [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension contributions | $ 1,290,000 us-gaap_PensionContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kex_SeafarersPensionTrustMember | $ 1,368,000 us-gaap_PensionContributions / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kex_SeafarersPensionTrustMember |
Contribution percentage to defined contribution plan (in hundredths) | 100.00%kex_DefinedContributionPlanContributionPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kex_SeafarersPensionTrustMember |  |
Maximum contribution limit (in hundredths) | 5.00%kex_DefinedBenefitPlanMaximumContributionLimit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = kex_SeafarersPensionTrustMember |  |

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- Definition Represents maximum entity's contribution limit to the concerned pension trust during the reporting period. + References No definition available. + Details
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- Definition Defined Contribution Plan Contribution Percentage. + References No definition available. + Details
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- Definition Pension Plan Defined Benefit Plan Cost Increase Limit Percentage + References No definition available. + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition The amount of cash or cash equivalents contributed by the entity to fund its pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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