Schedule of Assets (Held at End of Year) (Details) - EBP 004
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12 Months Ended |
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Dec. 31, 2025
USD ($)
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Plan Number |
004
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| Entity Tax Identification Number |
74-1884980
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| EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution |
$ 28,882,175
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[1] |
| EBP, Asset Held for Investment, Total |
$ 944,707,449
|
|
| EBP, Asset Held for Investment, Participant Loan, Maturity Date |
Mar. 15, 2039
|
[1] |
| Investment, Identifier [Axis]: Common Trust Funds |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 582,080,966
|
|
| Investment, Identifier [Axis]: Common Trust Funds BlackRock Russell 2000 Fund |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
BlackRock [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 40,256,378
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| Investment, Identifier [Axis]: Common Trust Funds Franklin Templeton Putnam Large Cap Value Trust CL1 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Franklin Templeton [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 38,099,106
|
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| Investment, Identifier [Axis]: Common Trust Funds Invesco Stable Value Retirement Fund CL1 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Invesco [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 97,253,884
|
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| Investment, Identifier [Axis]: Common Trust Funds Northern Trust Aggregate Bond Index DC NL Tier 3 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Northern Trust [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 65,602,299
|
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| Investment, Identifier [Axis]: Common Trust Funds Northern Trust MSCI ACWI EX US Index TR 3 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Northern Trust [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 79,543,793
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| Investment, Identifier [Axis]: Common Trust Funds Northern Trust S&P 500 Tier 3 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Northern Trust [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 175,687,980
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| Investment, Identifier [Axis]: Common Trust Funds T. Rowe Price retirement 2010A TR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 1,498,140
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| Investment, Identifier [Axis]: Common Trust Funds T. Rowe Price retirement 2015A TR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 1,770,041
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| Investment, Identifier [Axis]: Common Trust Funds T. Rowe Price retirement 2020A TR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 14,024,832
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| Investment, Identifier [Axis]: Common Trust Funds T. Rowe Price retirement 2025A TR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 8,296,900
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| Investment, Identifier [Axis]: Common Trust Funds T. Rowe Price retirement 2030A TR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 19,522,473
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| Investment, Identifier [Axis]: Common Trust Funds T. Rowe Price retirement 2035A TR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 10,656,944
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| Investment, Identifier [Axis]: Common Trust Funds T. Rowe Price retirement 2040A TR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 16,769,470
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| Investment, Identifier [Axis]: Common Trust Funds T. Rowe Price retirement 2045A TR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 5,466,494
|
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| Investment, Identifier [Axis]: Common Trust Funds T. Rowe Price retirement 2050A TR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 4,184,855
|
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| Investment, Identifier [Axis]: Common Trust Funds T. Rowe Price retirement 2055A TR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 2,756,961
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| Investment, Identifier [Axis]: Common Trust Funds T. Rowe Price retirement 2060A TR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 409,439
|
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| Investment, Identifier [Axis]: Common Trust Funds T. Rowe Price retirement 2065A TR |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
T. Rowe Price [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Common Collective Trust [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 280,977
|
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| Investment, Identifier [Axis]: Common stock Kirby Corporation Common stock |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Kirby Corporation Common stock [Member]
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
EBP, Employer, Common Stock [Member]
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Asset Held for Investment, Party-in-Interest [true false] |
true
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 53,677,515
|
[1] |
| Investment, Identifier [Axis]: Mutual Funds |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 280,066,793
|
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| Investment, Identifier [Axis]: Mutual Funds American Century Small Cap GR R6 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
American Century [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 21,645,481
|
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| Investment, Identifier [Axis]: Mutual Funds American Funds American Bond Fund of America Class R-6 |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
American Funds [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 20,175,898
|
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| Investment, Identifier [Axis]: Mutual Funds Blackrock Global Allocation Fund |
|
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
BlackRock [Member]
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 3,951,024
|
|
| Investment, Identifier [Axis]: Mutual Funds Dimensional Fund Advisors DFA Real Estate Securities Portfolio Institutional Class |
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Dimensional Fund Advisors [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 12,999,376
|
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| Investment, Identifier [Axis]: Mutual Funds Fidelity Mid Cap Index |
|
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
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| EBP, Investment, Issuer Name [Extensible Enumeration] |
Fidelity [Member]
|
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| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
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| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 42,611,039
|
|
| Investment, Identifier [Axis]: Mutual Funds Harbor International Fund |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Harbor [Member]
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 51,132,452
|
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| Investment, Identifier [Axis]: Mutual Funds Northern Trust Active Multi-Manager Emerging Markets Equity Fund |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Northern Trust [Member]
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 10,904,155
|
|
| Investment, Identifier [Axis]: Mutual Funds PIMCO Rae US Small Fund Institutional Class |
|
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
PIMCO [Member]
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 23,518,042
|
|
| Investment, Identifier [Axis]: Mutual Funds Prudential Jennison Large Cap Growth Fund |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Investment, Issuer Name [Extensible Enumeration] |
Prudential Jennison [Member]
|
|
| EBP, Investment, Current Value, Type [Extensible Enumeration] |
Mutual Fund [Member]
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] |
us-gaap-ebp:EmployeeBenefitPlanParticipantDirectedMember
|
|
| EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value |
$ 93,129,326
|
|
| Minimum |
|
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| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Asset Held for Investment, Participant Loan, Interest Rate |
4.00%
|
[1] |
| EBP, Asset Held for Investment, Participant Loan, Maturity Date |
Jan. 07, 2026
|
|
| Maximum |
|
|
| EBP, Schedule of Asset Held for Investment [Line Items] |
|
|
| EBP, Asset Held for Investment, Participant Loan, Interest Rate |
10.30%
|
[1] |
| EBP, Asset Held for Investment, Participant Loan, Maturity Date |
Mar. 15, 2039
|
|
|
|