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Contingencies and Commitments (Details) | 12 Months Ended
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Dec. 31, 2022 Bargeslip Spill Company
Portland Harbor Superfund Site [Member] |
Loss Contingencies [Line Items] |
Number of other companies also named as Potentially Responsible Parties ("PRPs") | Company | 250
Number of spills | Spill | 4
SBA Shipyard Site [Member] |
Loss Contingencies [Line Items] |
Number of barge slips | Bargeslip | 3

X
- Definition Refers to number of barge slips during the period. + References No definition available. + Details
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Namespace Prefix: | kex_
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Balance Type: | na
Period Type: | duration

X
- Definition Number of companies also named as potentially responsible parties under comprehensive environmental response compensation and liability act. + References No definition available. + Details
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Namespace Prefix: | kex_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of spills at the site to be declared as a Superfund site. + References No definition available. + Details
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Namespace Prefix: | kex_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |