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Related Party Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
ABS [Member] |  |  |
Related Party [Abstract] |  |  |
Related party expenses | $ 1.5 | $ 1.3 | $ 1.6
UK Protection & Indemnity Association [Member] |  |  |
Related Party [Abstract] |  |  |
Related party expenses | 3.6 | 3.4 | 3.2
Signal Member |  |  |
Related Party [Abstract] |  |  |
Related party expenses | 0.7 | 0.5 | 0.6
Strasburger & Price, LLP Member |  |  |
Related Party [Abstract] |  |  |
Legal services | 0.9 | 1.0 | 2.9
W. Sean O'Neil Attorney Member |  |  |
Related Party [Abstract] |  |  |
Legal services | 0.1 | $ 0.1 | $ 0.1
Mansfield Service Partners Member |  |  |
Related Party [Abstract] |  |  |
Related party expenses | $ 29.4 |  |

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- Definition Related Party Abstract + References No definition available. + Details
Name: | kex_RelatedPartyAbstract
Namespace Prefix: | kex_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
Name: | us-gaap_LegalFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Excludes Selling, General and Administrative Expense. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=kex_AmericanBureauOfShippingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=kex_UKProtectionIndemnityAssociationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=kex_SignalMutualIndemnityAssociationLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=kex_LimitedLiabilityPartnershipMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=kex_WSeanOneilAttorneyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=kex_MansfieldServicePartnersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |