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Leases (Schedule Of Rent Expense) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Property Subject To Or Available for Operating Lease [Line Items] |  |  |
Rental expense | $ 165,257 us-gaap_OperatingLeasesRentExpenseNet | $ 156,016 us-gaap_OperatingLeasesRentExpenseNet | $ 131,215 us-gaap_OperatingLeasesRentExpenseNet
Other Buildings and Equipment [Member] |  |  |
Property Subject To Or Available for Operating Lease [Line Items] |  |  |
Rental expense | 9,146 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = kex_OtherBuildingsAndEquipmentMember | 10,298 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = kex_OtherBuildingsAndEquipmentMember | 9,952 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = kex_OtherBuildingsAndEquipmentMember
Tank Barges [Member] | Marine Equipment [Member] |  |  |
Property Subject To Or Available for Operating Lease [Line Items] |  |  |
Rental expense | 19,780 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MarineServicesEquipmentMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = kex_TankBargesMember | 20,841 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MarineServicesEquipmentMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = kex_TankBargesMember | 23,835 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MarineServicesEquipmentMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = kex_TankBargesMember
Towing Vessels [Member] | Marine Equipment [Member] |  |  |
Property Subject To Or Available for Operating Lease [Line Items] |  |  |
Rental expense | $ 136,331 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MarineServicesEquipmentMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = kex_TowingVesselsMember | $ 124,877 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MarineServicesEquipmentMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = kex_TowingVesselsMember | $ 97,428 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_MarineServicesEquipmentMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = kex_TowingVesselsMember

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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