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Retirement Plans, Multiemployer Pension Plan and Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Plans [Abstract]
Aggregate contributions to the plans	$ 31.6	$ 26.9	$ 27.9
Seafarers Pension Trust [Member]
Retirement Plans [Abstract]
Pension contributions	0.7	$ 0.4
Contribution percentage to defined contribution plan		100.00%
Maximum contribution limit		5.00%
CPF [Member]
Retirement Plans [Abstract]
Pension contributions	$ 0.6	$ 0.6
Contribution percentage to defined contribution plan		108.00%

X

- 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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Namespace Prefix:	kex_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Refers to the defined contribution plan contribution as a percentage of the aggregate accumulated benefit obligation during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	kex_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanAdditionalInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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: