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Contingencies and Commitments (Details) | 6 Months Ended
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Jun. 30, 2021 USD ($)
Guaranties [Abstract] |
Issued guaranties | $ 23,396,000
Settlement Agreement [Member] |
Guaranties [Abstract] |
Payments for legal settlements | $ 2,102,000
Maximum [Member] |
Guaranties [Abstract] |
Guarantor obligations, expiration period | 3 years
Performance Bonds [Member] |
Guaranties [Abstract] |
Issued guaranties | $ 9,518,000
Letters of Credit [Member] |
Guaranties [Abstract] |
Issued guaranties | $ 13,878,000

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- Definition Term of the guarantee or each group of financial instruments used to support performance by the company and its subsidiaries in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | kex_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585 + Details
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Period Type: | duration

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- Details
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Period Type: |

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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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- Details
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