100000 - Document - Document and Entity Information
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100010 - Statement - CONSOLIDATED BALANCE SHEETS
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100020 - Disclosure - Leases, Future Minimum Lease Payments Under Operating Leases (Details) 2
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100030 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)
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100040 - Disclosure - Other Comprehensive Income (Loss) (Details) 3
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100050 - Disclosure - Taxes on Income, Earnings (Loss) Before Taxes (Details) 3
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100060 - Statement - CONSOLIDATED STATEMENTS OF EARNINGS
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100070 - Disclosure - Other Comprehensive Income (Loss) (Details) 4
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100080 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
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100090 - Disclosure - Other Comprehensive Income (Loss) (Details) 5
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100100 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS
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100110 - Statement - CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
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995455 - Disclosure - Summary of Significant Accounting Policies
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995465 - Disclosure - Acquisitions
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995475 - Disclosure - Revenues
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995485 - Disclosure - Segment Data
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995495 - Disclosure - Long-Term Debt
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995505 - Disclosure - Leases
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995515 - Disclosure - Impairments and Other Charges
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995525 - Disclosure - Stock Award Plans
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995535 - Disclosure - Taxes on Income
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995545 - Disclosure - Earnings Per Share
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995555 - Disclosure - Inventories
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995565 - Disclosure - Retirement Plans
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995575 - Disclosure - Other Comprehensive Income (Loss)
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995585 - Disclosure - Contingencies and Commitments
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995595 - Disclosure - Related Party Transactions
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995605 - Disclosure - Summary of Significant Accounting Policies (Policies)
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995615 - Disclosure - Summary of Significant Accounting Policies (Tables)
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995625 - Disclosure - Acquisitions (Tables)
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995635 - Disclosure - Revenues (Tables)
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995645 - Disclosure - Segment Data (Tables)
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995655 - Disclosure - Long-Term Debt (Tables)
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995665 - Disclosure - Leases (Tables)
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995675 - Disclosure - Stock Award Plans (Tables)
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995685 - Disclosure - Taxes on Income (Tables)
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995695 - Disclosure - Earnings Per Share (Tables)
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995705 - Disclosure - Inventories (Tables)
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995715 - Disclosure - Retirement Plans (Tables)
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995725 - Disclosure - Other Comprehensive Income (Loss) (Tables)
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995735 - Disclosure - Summary of Significant Accounting Policies (Details)
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995745 - Disclosure - Summary of Significant Accounting Policies, Summary of Balances of Property and Equipment - Net (Details)
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995755 - Disclosure - Summary of Significant Accounting Policies, Goodwill and Other Intangibles (Details)
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995765 - Disclosure - Summary of Significant Accounting Policies, Revenue Recognition through Accrued Insurance (Details)
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995775 - Disclosure - Acquisitions (Details)
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995785 - Disclosure - Revenues (Details)
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995795 - Disclosure - Revenues, Remaining Performance Obligation (Details)
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995805 - Disclosure - Segment Data (Details)
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995815 - Disclosure - Long-Term Debt, Carrying Value and Fair Value of Debt Outstanding (Details)
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995825 - Disclosure - Long-Term Debt, Borrowings and Payments under Bank Credit Facilities (Details)
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995835 - Disclosure - Long-Term Debt, Schedule of Aggregate Payments Due on Long-Term Debt (Details)
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995845 - Disclosure - Long-Term Debt (Details)
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995855 - Disclosure - Leases, Future Minimum Lease Payments Under Operating Leases (Details)
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995865 - Disclosure - Leases, Lease Cost (Details)
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995875 - Disclosure - Leases, Other Supplemental Information (Details)
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995885 - Disclosure - Impairments and Other Charges (Details)
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995895 - Disclosure - Stock Award Plans, Compensation Cost (Details)
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995905 - Disclosure - Stock Award Plans, Employee Plan Stock Option Activity (Details)
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995915 - Disclosure - Stock Award Plans, Employee Plan Outstanding and Exercisable Options (Details)
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995925 - Disclosure - Stock Award Plans, Employee Plan Restricted Stock Award Activity (Details)
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995935 - Disclosure - Stock Award Plans, Employee Plan RSU Activity (Details)
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995945 - Disclosure - Stock Award Plans, Director Plan Stock Option Activity (Details)
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995955 - Disclosure - Stock Award Plans, Director Plan Outstanding and Exercisable Options (Details)
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995965 - Disclosure - Stock Award Plans, Director Plan Restricted Stock Award Activity (Details)
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995975 - Disclosure - Stock Award Plans, All Plans Options and Restricted Stock Award Activity (Details)
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995985 - Disclosure - Taxes on Income, Earnings (Loss) Before Taxes (Details)
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995995 - Disclosure - Taxes on Income, Schedule of Effective Income Tax Rate Reconciliation (Details)
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996005 - Disclosure - Taxes on Income, Schedule of Deferred Tax Assets and Liabilities (Details)
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996015 - Disclosure - Taxes on Income, Reconciliation of Liability for Unrecognized Tax Benefits (Details)
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996025 - Disclosure - Earnings Per Share (Details)
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996035 - Disclosure - Schedule of Inventories, Net (Details)
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996045 - Disclosure - Retirement Plans, Information About Plan Assets and Asset Allocation (Details)
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996055 - Disclosure - Retirement Plans, Schedule of Change in Benefit Obligation (Details)
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996065 - Disclosure - Retirement Plans, Weighted-Average Assumption Used to Determine Benefit Obligation (Details)
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996075 - Disclosure - Retirement Plans, Summary of Change in Plan Assets (Details)
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996085 - Disclosure - Retirement Plans, Summary of Funded Status at End of Year (Details)
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996095 - Disclosure - Retirement Plans, Amounts Recognized in Consolidated Balance Sheets (Details)
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996105 - Disclosure - Retirement Plans, Amounts Recognized in Accumulated Other Comprehensive Income (Details)
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996115 - Disclosure - Retirement Plans, Expected Employer Contribution and Benefit Payments (Details)
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996125 - Disclosure - Retirement Plans, Components of Net Periodic Benefit Cost, Pension Benefits (Details)
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996135 - Disclosure - Retirement Plans, Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost, Pension Benefits (Details)
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996145 - Disclosure - Retirement Plans, Components of Net Periodic Benefit Cost, Other Postretirement Benefits (Details)
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996155 - Disclosure - Retirement Plans, Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost, Other Postretirement Benefits (Details)
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996165 - Disclosure - Retirement Plans, Multiemployer Pension Plan and Defined Contribution Plans (Details)
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996175 - Disclosure - Other Comprehensive Income (Loss) (Details)
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996185 - Disclosure - Contingencies and Commitments (Details)
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996195 - Disclosure - Contingencies and Commitments, Certain Significant Risks and Uncertainties (Details)
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996205 - Disclosure - Related Party Transactions (Details)
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Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Self Insurance
Insurance accruals
Auditor Firm ID
2024
Lessee, Operating Lease, Liability, to be Paid, Year One
Document Transition Report
Stock price volatility
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Life
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Weighted-average assumption used to determine benefit obligation at end of year [Abstract]
Restructuring Cost and Reserve [Line Items]
Geographical [Axis]
Noncontrolling Interest [Member]
Noncontrolling Interests [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period
Vesting period
Debt Instruments [Abstract]
Long-term Debt [Abstract]
Other Segment Disclosure Abstract
Other segment disclosures [Abstract]
Other segment disclosure [Abstract]
Other Liabilities, Noncurrent
Other Liabilities, Noncurrent, Total
Other long-term liabilities
Schedule of Segment Reporting Information, by Segment [Table]
RSUs [Member]
Restricted Stock Units (RSUs) [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Components of net periodic benefit cost [Abstract]
Fair Value, Inputs, Level 1 [Member]
Entity Public Float
2027
Lessee, Operating Lease, Liability, to be Paid, Year Four
Defined Benefit Plan, Cash and Cash Equivalents [Member]
Cash and Cash Equivalents [Member]
Three point four six series a notes due january nineteen two thousand thirty three.
Three point Four Six Series A Notes Due January Nineteen Two Thousand Thirty Three [Member]
3.46 Series A Notes Due January 19, 2023 [Member]
Income Tax, Policy [Policy Text Block]
Taxes on Income
Property, Plant and Equipment, Useful Life
Revenue from Contract with Customer, Excluding Assessed Tax
Revenues by major source
Revenues
Revenue from Contract with Customer, Excluding Assessed Tax, Total
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Amounts recognized in the consolidated balance sheets [Abstract]
Period in which recertification of ocean going vessels occur twice
Period in which recertification of ocean going vessels occur twice
Represents the period in which recertification of ocean going vessels occur twice.
Number of vessels involved in collision
Number of Maritime Vessels
Refers to the number of maritime (seagoing) vessels.
Marine Transportation [Member]
Marine Transportation [Member]
Marine transportation - A component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)
Actual return on plan assets
Income Tax Description Abstract
Income Taxes [Abstract]
Income Tax Description [Abstract]
Unrecognized compensation cost related to restricted stock
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Unrecognized compensation cost related to unvested awards
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total
Disaggregation of Revenue [Table Text Block]
Higman Pension Plan [Member]
Higman Pension Plan [Member]
Higman Pension Plan [Member]
Payments to Acquire Businesses, Net of Cash Acquired
Acquisitions of businesses and marine equipment, net of cash acquired
Payments to Acquire Businesses, Net of Cash Acquired, Total
Concentration Risk Type [Axis]
Defined Benefit Plan, Plan Assets, Payment for Settlement
Settlements
ICFR Auditor Attestation Flag
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]
Summary of Significant Accounting Policies
Schedule of Business Acquisitions, by Acquisition [Table]
Contract with Customer, Liability, Current
Deferred revenues
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
Change in Plan Assets
Compensation Cost Breakdown in Statement of Earnings
Share-Based Payment Arrangement, Cost by Plan [Table Text Block]
2025
Finite-Lived Intangible Assets and Liabilities, Amortization Expense, Year Two
Amount of amortization expense for assets and liabilities, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
Goodwill, Gross
Balance (gross)
Balance (gross)
Other Nonoperating Income
Other income
Goodwill, Acquired During Period
Income Tax Disclosure [Line Items]
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.
Thereafter
FiniteLivedIntangibleAssetsAndLiabilitiesAmortizationExpenseDueAfterYearFive
Finite lived intangible assets and liabilities amortization expense Due after year five
Operating Lease, Liability, Noncurrent
Operating lease liabilities - less current portion
Shares Outstanding Abstract
Shares outstanding [Abstract]
Shares Outstanding [Abstract]
Less: Net (earnings) loss attributable to noncontrolling interests
Net (earnings) loss attributable to noncontrolling interests
Net Income (Loss) Attributable to Noncontrolling Interest
Net Income (Loss) Attributable to Noncontrolling Interest, Total
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Defined Benefit Plan, Expected Return (Loss) on Plan Assets
Expected return on plan assets
Impairment Effects on Earnings Per Share [Line Items]
Unamortized debt discounts and issuance costs
Debt Instrument, Unamortized Discount
Debt Instrument, Unamortized Discount, Total
Related Party Transactions [Abstract]
Ultimate rate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Ultimate Health Care Cost Trend Rate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Ultimate Health Care Cost Trend Rate
Assets, Current
Total current assets
Contribution percentage to defined contribution plan
Defined Contribution Plan Contribution Percentage, aggregate accumulated benefit obligation
Refers to the defined contribution plan contribution as a percentage of the aggregate accumulated benefit obligation during the period.
Liabilities and Equity
Total liabilities and equity
Entity Address, State or Province
Deferred Tax Assets, Other
Other
Long-Term Debt [Text Block]
Long-Term Debt
Director Plan [Member]
Director Plan [Member]
Represents to director plan of the equity-based compensation arrangement plan.
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number
Outstanding at Period Start (in shares)
Outstanding at Period End (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Fair value of stock options granted (in dollars per share)
Comprehensive income (loss) attributable to Kirby
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Inventory Disclosure [Text Block]
Inventories
Trading Symbol
Deferred Tax Assets, Net of Valuation Allowance
Deferred tax assets, net of valuation allowance
Common Stock, Shares, Issued
Common Stock, Shares, Issued, Total
2025
2023
Other intangible liabilities - gross
Finite-Lived Intangible Liabilities, Gross
Amount before amortization of liabilities, excluding financial liabilities and goodwill, lacking physical substance with a finite life.
Prepaid Expense and Other Assets, Current
Prepaid expenses and other current assets
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table]
Net Income (Loss) Attributable to Parent [Abstract]
Net Income (Loss) Attributable to Parent [Abstract]
Convoy [Member]
Convoy Servicing Company and Agility Fleet Services, LLC [Member]
Refers to the entity that is being acquired or purchased in a merger or acquisition.
Total capacity of barrels
Total Capacity Barrels
Total capacity barrels.
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Change in plan assets [Roll Forward]
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years
Next five years
Schedule of Long-Term Debt Instruments [Table]
Foreign [Member]
Foreign Tax Authority [Member]
Canada [Member]
Shares, Outstanding
Ending balance (in shares)
Beginning balance (in shares)
Line of Credit Facility, Remaining Borrowing Capacity
Available borrowing capacity
2026
Lessee, Operating Lease, Liability, to be Paid, Year Three
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income [Member]
Business Combination Disclosure [Text Block]
Acquisitions
Total other comprehensive income , net of taxes
Other Comprehensive Income (Loss), Net of Tax
Deferred tax liabilities [Abstract]
Components of Deferred Tax Liabilities [Abstract]
Share-Based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
Outstanding and Exercisable Stock Options
Deferred Tax Liabilities, Property, Plant and Equipment
Property
Entity Address, City or Town
Related Party Transaction [Line Items]
2026
Finite-Lived Intangible Assets and Liabilities, Amortization Expense, Year Three
Amount of amortization expense for assets and liabilities, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
Weighted average discount rate
Operating Lease, Weighted Average Discount Rate, Percent
Higman [Member]
Higman Marine, Inc [Member]
Refers to the entity that is being acquired or purchased in a merger or acquisition.
Defined Benefit Plan, Benefit Obligation
Benefit obligation at beginning of year
Benefit obligation at end of year
Benefit obligations
Other Comprehensive Income (Loss)
Other Comprehensive Income, Noncontrolling Interest [Text Block]
Increase (Decrease) in Income Taxes Payable
Income taxes payable
Summary of Balances of Property and Equipment - Net
Property, Plant and Equipment [Table Text Block]
Years to ultimate
Defined Benefit Plan, Year Health Care Cost Trend Rate, Ultimate Trend Rate
Year ultimate health care cost trend rate is expected to be reached, in CCYY format.
Subsequent Event [Member]
Subsequent Event Type [Axis]
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions
Additions for tax positions of prior years
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
2024
Finite-Lived Intangible Assets and Liabilities, Amortization Expense, Next Twelve Months
Amount of amortization expense for assets and liabilities, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
Liabilities, Current [Abstract]
Current liabilities:
Assets, Current [Abstract]
Current assets:
Accounts Receivable, Allowance for Credit Loss, Current
Trade, allowance for doubtful accounts
Unrealized gain on defined benefit plans
Deferred Tax Assets Tax Deferred Expense of Non Current Unrealized gain Loss on Defined Benefit Plans
Deferred tax assets tax deferred expense of non current unrealized gain loss on defined benefit plans.
Impairment, Long-Lived Asset, Held-for-Use
Impairment, Long-Lived Asset, Held-for-Use, Total
Statement of Stockholders' Equity [Abstract]
Operating Lease, Liability, Current
Current portion of operating lease liabilities
Service period of participants who are age fifty not impacted by pension plan amendment
Employee Pension Plan, Grandfathered Participants, Participant Service Period Who is Fifty Years Old
The service period of eligible participants of the employee pension plan who have reached the age of fifty that will be grandfathered and not be impacted by the amendment to the pension plan.
Debt Instrument, Maturity Date
Maturity Date
Long-Term Debt
Term loan
Long-Term Debt
Long-term debt
Property and equipment - net
Property, Plant and Equipment, Net
Property and equipment - net
Property, Plant and Equipment, Net, Beginning Balance
Property, Plant and Equipment, Net, Ending Balance
Defined Benefit Plan, Benefit Obligation, Benefits Paid
Gross benefits paid
Number Exercisable (in shares)
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable, Beginning Balance
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable, Ending Balance
Plan 2016 and 2017 [Member]
Plan 2016 and 2017 [Member]
Higman pension plan for 2016 and 2017 year
Accounts Receivable, Credit Loss Expense (Reversal)
Provision (credit) for doubtful accounts
Effective income tax rate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
United States income tax statutory rate
Services segment's relationship term
Services Segments Relationship Years
Relationship term maintained by entity with customers.
Statement of Comprehensive Income [Abstract]
Scenario [Domain]
Treasury Stock, Common, Shares
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate
Discount rate
Entity Central Index Key
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures
Issuance of stock for equity awards, net of forfeitures
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total
Deferred Tax Asset, Tax Deferred Expense, Reserve and Accrual, Accounts Receivable, Allowance for Credit Loss
Allowance for doubtful accounts
Plan Name [Domain]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest [Abstract]
Earnings (loss) before taxes on income [Abstract]
Other Intangible Assets and Other Intangible Liabilities
Finite-lived Intangible Assets and Liabilities [Table Text Block]
Tabular disclosure of assets and liabilities, excluding financial assets, liabilities and goodwill, lacking physical substance with a finite life, by either major class or business segment.
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property
Gain (loss) on disposition of assets
Gain on disposition of assets
Gain on disposition of assets
Gain on disposition of assets
Increase (Decrease) in Other Operating Assets
Other assets
Increase (Decrease) in Other Operating Assets, Total
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period
Current
Current Foreign Tax Expense (Benefit)
Schedule of Goodwill [Table Text Block]
Changes in Goodwill
Employee Stock Award Plan [Member]
Employee Plan [Member]
Represents to employee plan of the equity-based compensation arrangement plan.
Liabilities, Current
Total current liabilities
Entity Tax Identification Number
Earnings (loss) before taxes on income
Earnings (loss) before taxes on income
Earnings (loss) before taxes on income
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
Segment profit (loss)
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]
Legal Fees
Legal services
Payments of Debt Issuance Costs
Payment of debt issue costs
Valuation allowance for state deferred tax assets
Valuation Allowance For State Deferred Tax Assets
Valuation allowance for state deferred tax assets.
Weighted Average Exercise Price [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]
Construction in Progress [Member]
Construction in Progress [Member]
Leases
Lessee, Operating Leases [Text Block]
Restricted Stock [Member]
Restricted Stock [Member]
Plan Name [Axis]
Geographical [Domain]
Assets
Total assets
Total assets
Operating Lease, Right-of-Use Asset
Operating lease right-of-use assets
Entity Registrant Name
Components of Deferred Tax Assets [Abstract]
Deferred tax assets [Abstract]
Notes Payable to Bank, Current
Bank notes payable
Related Party, Type [Domain]
Retained Earnings (Accumulated Deficit)
Retained Earnings (Accumulated Deficit), Total
Retained Earnings (Accumulated Deficit), Beginning Balance
Retained Earnings (Accumulated Deficit), Ending Balance
Retained earnings
Amortization of net actuarial (gain) loss, Net Amount
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Settlement, Reclassification Adjustment from AOCI, after Tax
Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) and settlement of defined benefit plan.
Amortization of net actuarial (gain) loss, Gross Amount
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Settlement, Reclassification Adjustment from AOCI, before Tax
Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) and settlement of defined benefit plan.
Supplemental Cash Flow Information [Abstract]
Supplemental disclosures of cash flow information:
Dry Docking And Ocean Going Vessels Abstract
Drydocking on Ocean-Going Vessels [Abstract]
Dry-docking and Ocean-Going Vessels [Abstract]
Share-Based Payment Arrangement, Expense, Tax Benefit
Income tax benefit
Guarantor obligations, expiration period
Term of Instrument Under Guarantor Obligations
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.
Retained Earnings [Member]
Retained Earnings [Member]
Outstanding (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Nonvested balance beginning of period (in shares)
Nonvested balance end of period (in shares)
Equity, Including Portion Attributable to Noncontrolling Interest
Ending balance
Beginning balance
Total equity
Federal Income Tax Expense (Benefit), Continuing Operations
Total U.S. Federal
Impairment of Intangible Assets, Finite-Lived
Impairment charge
Deferred Income Tax Liabilities, Net
Deferred income taxes
Deferred Income Tax Liabilities, Net, Total
Minimum [Member]
Minimum [Member]
Proceeds from Stock Options Exercised
Proceeds from exercise of stock options
Natural Disasters and Other Casualty Events [Member]
Operating Lease, Liability
Operating lease liabilities
Operating Lease, Liability, Total
Number of spills
Site Contingency Number Of Spills
Number of spills at the site to be declared as a Superfund site.
Significant Accounting Policies [Line Items]
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.
Forecast [Member]
Forecast [Member]
Schedule of Net Funded Status [Table Text Block]
Funded Status at End of Year
Restricted Stock Unit Activity Abstract
RSU Activity [Abstract]
Restricted Stock Unit Activity [Abstract]
Share-Based Payment Arrangement, Director [Policy Text Block]
Stock-Based Compensation
Accrued Income Taxes, Current
Income taxes payable
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Funded status at end of year [Abstract]
Disaggregation of Revenue [Abstract]
Equity Component [Domain]
Defined Contribution Plan, Cost
Aggregate contributions to the plans
Segments [Axis]
Land [Member]
Land [Member]
Defined Benefit Plan, Plan Assets, Contributions by Employer
Pension contributions
Employer contribution
Receivables [Abstract]
U.S. State [Abstract]
State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract]
Unusual or Infrequent Item, or Both [Axis]
Defined Benefit Plan, Expected Future Benefit Payment, Year Two
Year two
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair Value Assumptions [Abstract]
Operating Loss Carryforwards [Table]
Adjustments to reconcile net earnings (loss) to net cash provided by operations:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Amount excluded on unamortized debt discounts and issuance costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, Total
Sublease Income
Sublease income
Debt Disclosure [Abstract]
Earnings (loss) available to Kirby common stockholders - diluted
Net Income (Loss) Available to Common Stockholders, Diluted
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation
Tax withholdings on equity award vesting
Marine Transportation Segment [Member]
Marine Transportation Segment [Member]
Refers to the segment of business related maritime transport is the shipment of goods (cargo) and people by sea and other waterways.
Debt Instrument, Basis Spread on Variable Rate
Debt Instrument, Basis Spread on Variable Rate
Entity Current Reporting Status
Common Stock, Shares Authorized
Defined Benefit Plan, Equity Securities [Member]
Equity Securities [Member]
Unusual or Infrequent Item, or Both [Domain]
Deferred Tax Liabilities, Gross
Deferred tax liabilities
Deferred Tax Liabilities, Gross, Total
Deferred Foreign Income Tax Expense (Benefit)
Deferred
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year
First year
Range of renewal options under term contracts
Range Of Renewal Options Under Term Contracts
Validity period of contract with customers.
Energy storage system [Member]
Energy Storage System [Member]
Energy Storage System [Member]
Assets [Abstract]
ASSETS
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]
Goodwill
Pension plan defined benefit plan cost increase limit percentage
Pension Plan Defined Benefit Plan Cost Increase Limit Percentage
Refers to percentage of pension plan defined benefit plan cost increase limit during the period.
Revenue from Contract with Customer [Policy Text Block]
Revenue Recognition
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Weighted average assumptions used to determine net periodic benefit cost [Abstract]
Amortization of Intangible Assets
Amortization of Intangible Assets, Total
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant
Shares available for future grants (in shares)
Base Rate [Member]
Base Rate [Member]
Alternate Base Rate [Member]
Restricted Stock Award Activity Abstract
Restricted Stock Award Activity [Abstract]
Restricted Stock Award Activity [Abstract]
Common Stock, Value, Issued
Common Stock, Value, Issued, Total
Common Stock, Value, Issued, Beginning Balance
Common Stock, Value, Issued, Ending Balance
Common stock, $0.10 par value per share. Authorized 120,000,000 shares, issued 65,472,000
Repayments of Long-Term Debt
Payments on long-term debt
Payments on long-term debt
Repayments of Long-term Debt, Total
Other Noncash Income (Expense)
Other
Other Noncash Income (Expense), Total
Refers to the period of revenue derived form the term contracts maturity.
Revenue Derived From Term Contracts Maturity Period
Range of term contracts
Revenue Recognition [Abstract]
Revenue recognized
Contract with Customer, Liability, Revenue Recognized
Current Fiscal Year End Date
Amortization of share-based compensation
Share-Based Payment Arrangement, Noncash Expense
Share-based Payment Arrangement, Noncash Expense, Total
Auditor Name
Operating income (loss)
Operating Income (Loss)
Deferred
Deferred Income Tax Expense (Benefit)
Provision (benefit) for deferred income taxes
Deferred
(Provision) benefit for taxes on income
Income Tax Expense (Benefit)
Total Provision (benefit) for taxes on income
Benefit (provision) for taxes on income
Total Provision (benefit) for taxes on income
Schedule of Line of Credit Facilities [Table Text Block]
Borrowings and Payments Under the Bank Credit Facilities
Weighted Average Grant Date Fair Value Per Share [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets
Expected long-term rate of return on plan assets
Liability, Defined Benefit Plan, Noncurrent
Long-term liability
Liability, Defined Benefit Plan, Noncurrent, Total
2027
2025
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions
Reductions for tax positions of prior years
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Share-Based Payment Arrangement, Expense
Compensation cost
Buildings and Other Equipment [Member]
Buildings and Other Equipment [Member]
Buildings and other equipment.
Payment, Tax Withholding, Share-Based Payment Arrangement
Payments related to tax withholding for share-based compensation
Disaggregation of Revenue [Table]
Full Exercise Price Range [Member]
Total Exercise Price Range [Member]
This is the total range, encompassing the minimum exercise price amount, and the maximum exercise price amount. Its child Members should disaggregate the individual tranches of price ranges.
Period of amortization of shipyard costs
Period of amortization of shipyard costs
Represents the period of amortization of shipyard costs.
Finite-Lived Intangible Assets, Net
Other intangibles, net
Other intangible assets - net
Finite-Lived Intangible Assets, Net, Beginning Balance
Finite-Lived Intangible Assets, Net, Ending Balance
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate
Years to ultimate
Weighted average common stock issued and outstanding (in shares)
Weighted average common stock issued and outstanding
Number of shares of common stock determined by relating the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period.
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Revenue from Contract with Customer [Text Block]
Revenues
Expected Cash Flows for the Defined Benefit Plans and Postretirement Benefit Plan
Schedule of Expected Cash Flows [Table Text Block]
Tabular disclosure of benefits expected to be paid by or contributed to pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]
Impairment of Long-Lived Assets and for Long-Lived Assets to Be Disposed Of
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value
Aggregate Intrinsic Value, Options Outstanding
Debt Instrument, Face Amount
Long term debt, face amount
Gearbox Repair [Member]
Gearbox Repair [Member]
Gearbox repair
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions
Additions based on tax positions related to the current year
Portland Harbor Superfund Site [Member]
Represents portland Harbor Superfund Site.
Term Loan Due July 29,2027 [Member]
Term Loan Due July Twenty Nine Two Thousand Twenty Seven [Member]
Term Loan Due July 29, 2027 [Member]
Federal Income Tax Expense (Benefit), Continuing Operations [Abstract]
U.S. Federal [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract]
Future Minimum Lease Payments Under Operating Leases [Abstract]
Provision For Taxes On Income Abstract
Provision (benefit) for taxes on income [Abstract]
Provision for taxes on income [Abstract]
Provision (benefit) for taxes on income [Abstract]
Coastal Transportation [Member]
Refers to coastal transportation of refined petroleum products and black oil.
Coastal Transportation [Member]
Self Insurance Reserve [Policy Text Block]
Accrued Insurance
Property, Plant and Equipment [Abstract]
Accrued Insurance
Accrued insurance liabilities
Long-Term Debt, Type [Domain]
Entity Voluntary Filers
Refers to revolving credit facility debt instruments.
Revolving Credit Facility Due June Thirty Two Thousand Twenty One [Member]
Credit line due June 30, 2021 [Member]
Commitments and Contingencies Disclosure [Abstract]
Other Assets, Noncurrent
Other assets
Other Assets, Noncurrent, Total
Operating Leases, Weighted Average Discount Rate and Remaining Lease Term
Operating Leases, Weighted Average Discount Rate and Remaining Lease Term [Table Text Block]
operating leases related to weighted average discount rate and weighted average remaining lease term.
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross
Granted (in shares)
Intersegment Eliminations [Member]
Other Accrued Liabilities, Current
Other
Interest Paid, Excluding Capitalized Interest, Operating Activities
Interest paid
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax
Total recognized in net periodic benefit cost and other comprehensive income
Retirement Plan Type [Domain]
Inventory, Net [Abstract]
Equity, Attributable to Parent [Abstract]
Kirby stockholders' equity:
Thereafter
Lessee, Operating Lease, Liability, to be Paid, after Year Five
Lease, Cost [Table Text Block]
Impairment of Intangible Assets (Excluding Goodwill)
Impairment of Intangible Assets (Excluding Goodwill), Total
Secured Debt [Member]
Defined Benefit Plan, Interest Cost
Interest cost
Interest cost
Loss Contingency Nature [Axis]
Bank Note Payable [Member]
Bank Note Payable [Member]
Refers to a bank note payable.
Other Postretirement Benefits Plan [Member]
Other Postretirement Benefits [Member]
Line of Credit Facility, Maximum Borrowing Capacity
Maximum borrowing capacity
Asset Impairment Charges [Abstract]
Number of Reporting Units
Number of reporting units
3.29% Senior Notes Due February, 27 2023 [Member]
Senior Notes Series B Due February 27, 2023 [Member]
Senior Notes Series B Due February Twenty Seven Two Thousand Twenty Three [Member]
Refers to the senior notes debt instruments.
Net earnings (loss) per share attributable to Kirby common stockholders:
Earnings Per Share [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block]
Future Minimum Lease Payments under Operating Leases
Loss Contingencies [Table]
Consolidated Abstract
Consolidated [Abstract]
Insurance [Abstract]
Deferred Tax Liabilities, Net
Net deferred tax liabilities
Deferred Tax Liabilities, Net, Total
Accounting Policies [Abstract]
Segments [Domain]
Actuarial gain , Gross Amount
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax
Recognition of actuarial gain
Recognition of actuarial loss
Drydocking on Ocean-Going Vessels
Dry Docking Requirements [Policy Text Block]
Disclosure of accounting policy for entity's ocean-going vessels are subject to regulatory dry docking requirements after certain periods of time to be inspected, and have planned major maintenance performed.
Scenario [Axis]
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Concentrations of Credit Risk
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value of stock options granted
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Fair Value
Refers to amount of fair value of options granted during the period.
One-time deferred tax provision
One-time deferred tax provision
One-time deferred tax provision
Struck by LPG Tanker, the Genesis River [Member]
Unasserted Claim 1 [Member]
A claim for damages that is likely to be made and for which it is reasonably possible that there will be an unfavorable outcome, such as a likelihood that lawsuits from parties as yet unidentified will be filed alleging injury from using a product when other parties have successfully sued the entity for such use.
Insurance premiums and claims
Insurance Premiums And Claims
Insurance premiums and claims are reviewed by the entity's for their validity and then paid out to the insured or requesting party (on behalf of the insured) once approved.
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Expected benefit payments (gross) [Abstract]
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Return of investment to noncontrolling interests
Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Equity:
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
Change in Benefit Obligation
Underlying Asset Class [Domain]
Revolving Credit Facility [Member]
Revolving Credit Facility [Member]
Basic (in dollars per share)
Earnings Per Share, Basic
Earnings Per Share, Basic, Total
Customer Concentration Risk [Member]
Customers [Member]
Environmental Costs, Policy [Policy Text Block]
Environmental Liabilities
Damages and assessment cost.
Damages and Assessment Cost
Environmental Remediation Site [Domain]
Commitments and Contingencies
Contingencies and commitments
Inland Tank Barges [Member]
Inland Tank Barges [Member]
Inland Tank Barges
Business Combinations [Abstract]
Income Statement [Abstract]
Defined Benefit Plan, Amortization of Gain (Loss)
Amortization of actuarial gain
Amortization of actuarial loss
Related Party, Type [Axis]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Information about Plan Assets [Abstract]
Amortization of major maintenance costs
Amortization of Major Maintenance Costs
Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.
Operating Lease, Cost
Operating lease cost
Short-term lease cost
Short-Term Lease, Cost
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense
Income tax penalties and interest recognized
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Asset Allocation Among Asset Categories [Abstract]
Goodwill, Impaired, Accumulated Impairment Loss
Accumulated impairment and amortization
Accumulated impairment and amortization
Retirement Benefits [Abstract]
Statistical Measurement [Domain]
Loss Contingencies [Line Items]
Accruals for revenues earned included in accounts receivable
Unbilled Receivables, Current
Net Cash Provided by (Used in) Operating Activities
Net cash provided by operating activities
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested
Intrinsic value of restricted stock vesting
2028
Finite-Lived Intangible Assets and Liabilities, Amortization Expense, Year Five
Amount of amortization expense for assets and liabilities, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
Document Period End Date
Statistical Measurement [Axis]
Commitments and Contingencies Disclosure [Text Block]
Contingencies and Commitments
General corporate expenses
General corporate expenses
Refers to amount of general corporate expenses.
Operating Lease, Payments
Operating cash outflow from operating leases
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement
Settlements
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement, Total
Settlements
Diluted (in dollars per share)
Earnings Per Share, Diluted
Earnings Per Share, Diluted, Total
Product and Service [Domain]
Lease, Cost [Abstract]
Deferred Tax Assets, Operating Loss Carryforwards
Operating loss carryforwards
Deferred Tax Assets, Operating Loss Carryforwards, Total
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Total
Foreign currency translation, Income Tax (Provision) Benefit
Unrecognized Tax Benefits
Balance at beginning of year
Balance at end of year
Inland Transportation [Member]
Refers to inland transportation of petrochemical feedstock, chemicals, pressurized products, refined petroleum products, certain black oil, agricultural chemicals and black oil, such as asphalt.
Inland Transportation [Member]
Internal Revenue Service (IRS) [Member]
Thereafter
Long-Term Debt, Maturity, after Year Five
General corporate assets
Assets other than goodwill that contribute to the future cash flows of both the cash-generating unit under review and other cash-generating units.
Share Based Compensation Plans Combined Disclosure Abstract
Share-based Compensation Plans Combined Disclosure [Abstract]
Share based Compensation Plans Combined Disclosure [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period
Term of grant
Revenue from Contract with Customer [Abstract]
Debt Securities Payable [Member]
Performance Bonds [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options Abstract
Options Exercisable [Abstract]
Share based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Exercisable Options [Abstract]
Debt Instrument, Name [Domain]
Signal Member
Signal Mutual Indemnity Association Ltd [Member]
The company which is self-insurance not-for-profit organization authorized by the U.S. Department of Labor as a longshore worker's compensation insurance provider.
Fair Value Hierarchy and NAV [Domain]
Cash Paid During Period Abstract
Cash paid (received) during the period:
Cash paid during the period [Abstract]
Years open to audit under the statute of limitations
Operating losses tax year
Open Tax Year
Operating Loss Carryforwards [Line Items]
Loss Contingency, Nature [Domain]
Defined Benefit Plan, Equity Securities, US [Member]
U.S. Equity Securities [Member]
Number of Reportable Segments
Number of reportable segments
Additional Paid in Capital, Common Stock
Additional Paid in Capital, Common Stock, Beginning Balance
Additional Paid in Capital, Common Stock, Ending Balance
Additional paid-in capital
Related Party Abstract
Related Party [Abstract]
Inventories
Inventory, Policy [Policy Text Block]
Pension Benefits [Member]
Pension Plan [Member]
Aggregate Payments due on Long-Term Debt
Schedule of Maturities of Long-Term Debt [Table Text Block]
Defined Benefit Plan, Additional Information [Abstract]
Retirement Plans [Abstract]
3.51% senior notes due January 19, 2033 [Member]
Three Point Five One Percentage Senior Notes Due January Nineteen Two Thousand Thirty Three [Member]
Three Point Five One Percentage Senior Notes Due January Nineteen Two Thousand Thirty Three [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage
Asset allocations
Components of Deferred Tax Assets and Liabilities [Abstract]
Weighted Average Exercise Price, Options Exercisable (in dollars per share)
Share-Based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price
Real Estate Investment [Member]
Treasury stock purchases
Treasury stock purchases
Payments for Repurchase of Common Stock
Equity, Attributable to Noncontrolling Interest
Stockholders' Equity Attributable to Noncontrolling Interest, Total
Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance
Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance
Noncontrolling interests
Schedule of Restructuring and Related Costs [Table]
Capital expenditures included in accounts payable
Capital Expenditures Incurred, Paid and Not yet Paid
Current and future cash outflow to pay for purchases of fixed assets that have occurred.
Capital expenditures included in accounts payable
Proceeds from (Repayments of) Notes Payable
Borrowings on long-term debt
Proceeds from (Repayments of) Notes Payable, Total
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period
Stock option exercises (in shares)
Exercised (in shares)
Consolidation, Policy [Policy Text Block]
Principles of Consolidation
Other intangible liabilities - net
Finite Lived Intangible Liabilities Net
Amount after amortization of liabilities, excluding financial liabilities and goodwill, lacking physical substance with a finite life.
Liabilities and Equity [Abstract]
LIABILITIES AND STOCKHOLDERS' EQUITY
Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table]
Entity Address, Postal Zip Code
Mansfield Service Partners Member
Mansfield Service Partners [Member]
Mansfield Service Partners.
Entity Interactive Data Current
Plan 2020 [Member]
Plan 2020 [Member]
Higman pension plan for 2020 year.
Unrecognized Tax Benefits that Would Impact Effective Tax Rate
Increase (Decrease) in Accounts Payable
Accounts payable
Increase (Decrease) in Accounts Payable, Total
Credit Facility [Domain]
Excise taxes on treasury stock purchases
Excise Taxes On Treasury Stock Purchases
Excise taxes on treasury stock purchases
Lessee, Operating Lease, Liability, Undiscounted Excess Amount
Less: imputed interest
Borrowings (Payments) on bank credit facilities
Proceeds from (Repayments of) Lines of Credit
Borrowings (payments) on bank credit facilities, net
Granted (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period
Entity Well-known Seasoned Issuer
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Exercised (in dollars per share)
Entity Incorporation, State or Country Code
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [Abstract]
Cash and Cash Equivalents, Policy [Policy Text Block]
Cash Equivalents
Net earnings (loss) per share basic attributable to Kirby common stockholders:
Earnings Per Share, Basic [Abstract]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax [Abstract]
Non Cash Investing Activity Abstract
Non-cash investing activity:
Non-cash investing activity: [Abstract]
Equity Components [Axis]
Summary of Income Tax Contingencies [Table Text Block]
Reconciliation of Liability for Unrecognized Tax Benefits
Increase (Decrease) in Accounts Receivable
Accounts receivable
Accrual for Taxes Other than Income Taxes, Current
Taxes - other than on income
Other Segments [Member]
Other [Member]
Defined Benefit Plan, Plan Assets, Amount
Fair value of plan assets at beginning of year
Fair value of plan assets at end of year
Fair value of plan assets
Defined Benefit Plan, Plan Assets, Amount, Total
Retirement Benefits [Text Block]
Retirement Plans
Debt Instrument Carrying Value And Fair Value Abstract
Carrying Value and Fair Value of Debt Outstanding [Abstract]
Debt Instrument, Carrying Value and Fair Value [Abstract]
Inventory Disclosure [Abstract]
Cash paid for acquisition
Cash paid for acquisition
Payments to Acquire Businesses, Gross
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]
Amounts Recognized in Accumulated Other Comprehensive Income
Number of maritime vessels acquired
Number of maritime vessels acquired
Number of Maritime Vessels Acquired
Refers to the number of maritime (seagoing) vessels acquired.
Federal operating loss deferred tax assets
Deferred Tax Assets, Tax Credit Carryforwards, Foreign
Number of tank barges
Number of Tank Barges
Number of tank barges.
Vested (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Local Phone Number
Property, Plant and Equipment [Line Items]
Current Federal Tax Expense (Benefit)
Current
Term Loan [Member]
Term Loan Facility [Member]
A credit facility arrangement that is repayable in quarterly installments in increasing percentages of the original principal amount of the loan.
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures
Issuance of stock for equity awards, net of forfeitures (in shares)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total
Goodwill
Balance
Balance
Goodwill
Goodwill, Total
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities
Accrued and other liabilities
Capitalized interest excluded from interest expense
Interest Costs Capitalized
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Weighted average amortization period for intangible assets and liabilities
Intangible Assets and Liabilities Weighted Average Amortization Period
Weighted average amortization period for intangible assets and liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
Payments to Noncontrolling Interests for Return of Investment
Amount payment to noncontrolling interest for return of investment during the period.
Return of investment to noncontrolling interests and other
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]
Income Tax Authority [Domain]
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated other comprehensive income - net
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total
Segment Reporting Information [Line Items]
Document Annual Report
Amortization of share-based compensation
Share-Based Payment Arrangement, Amount Capitalized
Other Segment Reporting Information
Schedule Of Other Segment Reporting Information By Segment [Table Text Block]
Tabular disclosure of the profit or loss and total assets for other segment information.
Common Stock, Par or Stated Value Per Share
Represents to stock and incentive plan of the equity-based compensation arrangement plan.
Stock and Incentive Plan 2005 [Member]
2005 Stock and Incentive Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate
Discount rate
Debt Instrument, Interest Rate, Stated Percentage
Interest rate
Debt instrument, interest rate, stated percentage
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Weighted average period of recognition in years
Long-Lived Tangible Asset [Axis]
Company's provision for taxes on income varied from the statutory federal income tax rate [Abstract]
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Maximum [Member]
Maximum [Member]
3.46% Senior Notes Due January 19, 2033 [Member]
Senior Notes Due January Nineteen Two Thousand Thirty Three [Member]
Senior notes due january nineteen two thousand thirty three.
Net earnings (loss) per share diluted attributable to Kirby common stockholders:
Earnings Per Share, Diluted [Abstract]
Consolidation Items [Domain]
Percentage of inland revenue
Percentage Of Inland Revenue
Percentage of inland revenue from movement of products under term contracts.
4.2% Senior Notes Due March 1, 2028 [Member]
Senior Notes Due March 1, 2028 [Member]
Senior Notes Due March One Two Thousand Twenty Eight [Member]
Refers to the senior notes debt instruments.
Settlement Agreement [Member]
Settlement agreement.
Settlement Agreement [Member]
Number of vessels damaged in collision resulting in fuel oil discharge
Number of vessels damaged in collision resulting in fuel oil discharge.
Fair Value, Inputs, Level 3 [Member]
Level 3 [Member]
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect
Increase (decrease) in cash and cash equivalents
Defined Benefit Plan, Service Cost
Service cost
Service cost
Unrecognized tax benefits including interest and penalties
Unrecognized Tax Benefits Including Income Tax Penalties and Interest
This element represents the total of unrecognized tax benefits including interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity and the amount of statutory penalties in the period in which the entity claims or expects to claim a tax position, in its tax return, that does not meet the minimum statutory threshold to avoid payment of penalties.
Service period of participants not impacted by pension plan amendment
Employee Pension Plan, Grandfathered Participants, Service Period
The service period of eligible participants of the employee pension plan who will be grandfathered and not be impacted by the amendment to the pension plan.
Defined Benefit Plan, Expected Future Benefit Payment, Year Four
Year four
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements
Dilutive effect of stock options and restricted stock units (in shares)
Incremental Common Shares Attributable to Share-based Payment Arrangements, Total
Outstanding And Exercisable Stock Options Abstract
Outstanding and Exercisable Stock options [Abstract]
Expired (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period
Document Financial Statement Error Correction [Flag]
Document Financial Statement Error Correction [Flag]
Operating Segments [Member]
Reportable Segments [Member]
Significant Accounting Policies [Table]
Schedule detailing all significant accounting policies of the reporting entity.
Schedule of Inventories, Net
Schedule of Inventory, Current [Table Text Block]
Supplemental Employee Retirement Plan [Member]
SERP [Member]
Segment Reporting Disclosure [Text Block]
Segment Data
City Area Code
Actuarial gain , Income Tax (Provision) Benefit
Actuarial gains (losses), Income Tax (Provision) Benefit
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
Changes in Other Comprehensive Income (Loss)
Deferred
Deferred State and Local Income Tax Expense (Benefit)
Inventories - net
Inventory, Net
Inventories - net
Cash flows from operating activities:
Net Cash Provided by (Used in) Operating Activities [Abstract]
Total other comprehensive income (loss), Gross Amount
Other Comprehensive Income (Loss), before Tax
Consolidation Items [Axis]
Savage Inland Marine, LLC and Convoy [Member]
Savage Inland Marine, LLC and Convoy Servicing Company and Agility Fleet Services, LLC [Member]
Refers to the entity that is being acquired or purchased in a merger or acquisition.
Distribution and Services Segment [Member]
Distribution and Services [Member]
Distribution And Services [Member]
Distribution and services - A component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.
Business Acquisition [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase
Rate of compensation increase
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Accumulated depreciation
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Accumulated depreciation
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance
Accumulated depreciation
Defined Benefit Plan, Plan Assets, Benefits Paid
Gross benefits paid
Weighted Average Number of Shares Outstanding, Basic (in Shares)
Weighted Average Number of Shares Outstanding, Basic
Defined Benefit Plan, Expected Future Employer Contributions [Abstract]
Expected employer contributions [Abstract]
Guarantor Obligations, Maximum Exposure, Undiscounted
Issued guaranties
Inventory, Work in Process, Gross
Net Cash Provided by (Used in) Financing Activities [Abstract]
Cash flows from financing activities:
Foreign Income Tax Expense (Benefit), Continuing Operations
Total Foreign
Second Price Range [Member]
Second Price Range [Member]
Represents information of second price range of option prices pertaining to options granted.
Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
Restricted Stock Award Activity
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
RSU Activity
Statement [Table]
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
Stock Option Activity
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Stock Option Valuation Assumptions
Document Fiscal Period Focus
Lessee, Operating Lease, Liability, to be Paid
Total lease payments
Liabilities, Noncurrent
Total long-term liabilities
Share-Based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit
Range of Exercise Prices, lower limit (in dollars per share)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase
Rate of compensation increase
Related Party Transactions Disclosure [Text Block]
2025
Lessee, Operating Lease, Liability, to be Paid, Year Two
Statement [Line Items]
Statement [Line Items]
Other Assets [Abstract]
Carrying Values and Fair Values of Debt Outstanding
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
Fair value
Fair value
Debt Instrument, Fair Value Disclosure
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Antidilutive securities excluded from computation of earnings per share (in shares)
Contract assets
Contract with Customer, Asset, after Allowance for Credit Loss
Contract with Customer, Asset, after Allowance for Credit Loss, Total
Customer relationship period
Customer Relationship Period
Period referring customer relationship maintained by some of the manufacturing and refining customers.
Foreign [Abstract]
Foreign Income Tax Expense (Benefit), Continuing Operations [Abstract]
Lease, Cost
Total lease cost
Exercise Price Range [Domain]
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority
Tax refund amount
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax
Prior service cost (credit)
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Deferred Tax Assets and Liabilities
Trade - less allowance for doubtful accounts of $7,636 ($7,684 in 2022)
Accounts Receivable, after Allowance for Credit Loss, Current
Accounts Receivable, after Allowance for Credit Loss, Current, Total
Receivables from insurance companies to cover claims in excess included in accounts receivable
Receivables From Insurance Companies To Cover Claims In Excess Included In Accounts Receivable
Refers to the amount of receivables from insurance companies to cover claims in excess included in accounts receivable.
Common Stock [Member]
Debt Instrument [Line Items]
Defined Benefit Plan, Debt Security [Member]
Debt Securities [Member]
Accounts Receivable, after Allowance for Credit Loss, Current [Abstract]
Accounts receivable:
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax
Current year actuarial loss (gain)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), after Reclassification Adjustment, before Tax, Total
Credit Line due June 30, 2024 [Member]
Revolving Credit Facility Due June Thirty Two Thousand Twenty Four [Member]
Revolving credit facility due June thirty two thousand twenty four member.
Plan 2019 [Member]
Plan 2019 [Member]
Higman pension plan for 2019 year.
Cash and Cash Equivalents, at Carrying Value
Cash and Cash Equivalents, at Carrying Value, Total
Cash and Cash Equivalents, at Carrying Value, Beginning Balance
Cash and Cash Equivalents, at Carrying Value, Ending Balance
Cash and cash equivalents
Aggregate Intrinsic Value, Options Exercisable
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value
Building [Member]
Buildings [Member]
Undistributed earnings allocated to restricted shares
Undistributed earnings reallocated to restricted shares
Undistributed Earnings Reallocated To Restricted Shares
Undistributed Earnings Reallocated To Restricted Shares.
Entity Common Stock, Shares Outstanding
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax
Total recognized in other comprehensive income
Inventory, Finished Goods, Gross
Inventory, Finished Goods, Gross, Total
Guarantor Obligations, Nature [Domain]
Guarantor Obligations, Nature [Axis]
Treasury stock - at cost, 6,843,000 shares in 2023 and 5,565,000 shares in 2022
Treasury Stock, Value
Treasury Stock, Value, Total
Treasury Stock, Value, Beginning Balance
Treasury Stock, Value, Ending Balance
Cover [Abstract]
Selling, General and Administrative Expense
Selling, General and Administrative Expense, Total
Document Fiscal Year Focus
Other Intangibles
Intangible Assets, Finite-Lived, Policy [Policy Text Block]
Deferred state taxes
Deferred Tax Liabilities State Taxes
Amount of deferred tax liability attributable to taxable temporary differences from deferred state taxes.
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
Accrued liabilities for payment of interest and penalties
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total
Payments for Legal Settlements
Payments for legal settlements
Cash and Equity Securities [Member]
Cash and equity securities.
Income Taxes Paid, Net
Income Taxes Paid, Net, Total
Income taxes paid (refunded), net
Other Supplemental Information About Operating Leases Abstract
Other Supplemental Information about Operating Leases [Abstract]
Other Supplemental Information about Operating Leases [Abstract]
State and Local Income Tax Expense (Benefit), Continuing Operations
Total U.S. State
Interest Payable, Current
Interest
CPF [Member]
Central Pension Fund of the International Union of Operating [Member]
Central Pension Fund of the International Union of Operating (CPF) is a defined benefit plan providing retirees with a predetermined monthly retirement benefit upon reaching a specific age. The retirement benefit paid to a retiree is typically calculated using a formula which often employs years of credited service under the plan and salary information. The retirement benefit is typically payable to the employee upon attainment of their normal retirement age for the remainder of his/her lifetime. Benefits under this type of plan are often referred to as accrued benefits. This type of plan does not maintain individual accounts for employees.
Third Price Range [Member]
Third Price Range [Member]
Represents information of third price range of option prices pertaining to options granted.
Credit Line Due June 30, 2024 [Member]
Credit Line Due June Thirty Two Thousand Twenty Four [Member]
Credit line due june thirty two thousand twenty four.
Defined Benefit Plan, Expected Future Benefit Payment, Year Five
Year five
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Granted (in dollars per share)
Segment Reporting [Abstract]
Maximum contribution limit
Defined Benefit Plan Maximum Contribution Limit
Represents maximum entity's contribution limit to the concerned pension trust during the reporting period.
Proceeds from Sale of Productive Assets
Proceeds from Sale of Productive Assets, Total
Proceeds from disposition of assets and other
Proceeds from sale of assets
Security Exchange Name
United States [Member]
Domestic Tax Authority [Member]
Tax benefit from restricted stock vesting
Tax Benefit From Restricted Stock Vesting
Tax benefit from restricted stock vesting during the reporting period.
New Accounting Pronouncements, Policy [Policy Text Block]
Accounting Standards Adoptions
Related party expenses
Operating Costs and Expenses
Operating Costs and Expenses, Total
Deferred Tax Assets, State Taxes
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options Abstract
Options Outstanding [Abstract]
Share based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Outstanding Options [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Total
Foreign currency translation, Gross Amount
Open Tax Year Abstract
Open Tax Year [Abstract]
Open Tax Year [Abstract]
Property and equipment, gross
Property, Plant and Equipment, Gross
Property and equipment
Property, Plant and Equipment, Gross, Beginning Balance
Property, Plant and Equipment, Gross, Ending Balance
2027
Finite-Lived Intangible Assets and Liabilities, Amortization Expense, Year Four
Amount of amortization expense for assets and liabilities, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
Current State and Local Tax Expense (Benefit)
Current
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability
Right-of-use assets obtained in exchange for lease obligations
Number of barge slips
Number of barge slips
Refers to number of barge slips during the period.
Treasury Stock, Shares, Acquired
Treasury stock purchases (in shares)
Expired (in dollars per share)
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price
Business Acquisition, Acquiree [Domain]
Total other comprehensive income (loss), Income Tax (Provision) Benefit
Total other comprehensive income, income tax (provision) benefit
Other Comprehensive Income (Loss), Tax
Other Comprehensive Income (Loss), Tax, Total
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax
Accumulated other compensation income
Commitment Amount
Line of Credit Facility, Commitment Fee Amount
Stock option exercises
Stock Issued During Period, Value, Stock Options Exercised
Entity Emerging Growth Company
Repurchase Agreements, Valuation, Policy [Policy Text Block]
Treasury Stock
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value
Intrinsic value of stock options exercised
Number Outstanding (in shares)
Share-Based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Beginning Balance
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding, Ending Balance
Amendment Flag
Defined Benefit Plan, Assumptions [Table Text Block]
Weighted-Average Assumption Used to Determine Benefit Obligation and Net Periodic Benefit Cost
Employee Stock Award Plan Abstract
Stock Award Plan Information [Abstract]
Employee Stock Award Plan [Abstract]
Income tax receivable
Deferred Income Taxes and Other Tax Receivable, Current
ABS [Member]
American Bureau of Shipping [Member]
The company which is not-for-profit that provides global classification services to the marine, offshore and gas industries.
Costs of sales and operating expenses
Costs Of Sales And Operating Expenses
Costs incurred and are directly related to generating revenues and 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.
Impairment Effects on Earnings Per Share [Table]
Defined Benefit Plan, Plan Assets, Category [Axis]
Commercial and Industrial [Member]
Commercial and Industrial [Member]
Refers to selling OEM replacement parts and new diesel engines, provides service mechanics and maintains facilities to overhaul and repair diesel engines and ancillary products for marine and on-highway transportation companies, mining and industrial companies. The Company provides engineering and field services, OEM replacement parts and safety-related products to power generation operators and to the nuclear industry, manufactures engine generator and pump packages for power generation operators and municipalities, offers power generation systems customized for specific commercial and industrial applications, and rents equipment including power generation systems, pumps, air compressors, fork lifts and railcar movers.
Noncurrent asset
Assets for Plan Benefits, Defined Benefit Plan
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits
Deferred compensation
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Total
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate
Ultimate rate
KMT'S
Kirby Marine Transportation (KMT's) [MEMBER]
Kirby marine transportation (KMT's) [member].
Term Loan Due March 27,2024 [Member]
Term Loan due March Twenty Seven Two Thousand Twenty Four [Member]
Term Loan due March Twenty Seven Two Thousand Twenty Four [Member]
Proceeds from Legal Settlements
Proceeds from legal settlements
Leases [Abstract]
Weighted Average Exercise Price, Options Outstanding (in dollars per share)
Share-Based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price, Beginning Balance
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price, Ending Balance
Percentage of costal revenue
Percentage of coastal revenue
Percentage of costal revenue from movement of products under term contracts.
Plan 2018 [Member]
Plan 2018 [Member]
Higman pension plan for 2018 year.
Variable Rate [Domain]
Securities Act File Number
Finite Lived Intangible Assets And Liabilities Estimated Amortization Expense Fiscal Year Maturity Abstract
Intangible Assets and liabilities, Estimated Amortization Expense, Fiscal Year Maturity [Abstract]
Finite-Lived Intangible Assets and Liabilities, Estimated Amortization Expense, Fiscal Year Maturity [Abstract]
Line of Credit Facility, Expiration Date
Credit facility, expiration date
Accumulated amortization
Finite Lived Intangible Liabilities Accumulated Amortization
Accumulated amount of amortization of liabilities, excluding financial liabilities and goodwill, lacking physical substance with a finite life.
Deferred Tax Assets, Gross
Deferred tax assets, gross
Receivable [Policy Text Block]
Accounts Receivable
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)
Actuarial (gain) loss
Goodwill and Intangible Assets Disclosure [Abstract]
Long-Term Debt, Excluding Current Maturities
Long-term debt, net - less current portion
Long-term Debt, Excluding Current Maturities, Total
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents
Cash and cash equivalents, end of year
Cash and cash equivalents, beginning of year
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Health care cost trend rate [Abstract]
Other Assets
Total other assets
Share-Based Payment Arrangement [Abstract]
Defined Benefit Plan, Expected Future Benefit Payment, Year One
Year one
Strasburger & Price, LLP Member
Limited Liability Partnership [Member]
Legal form of business company offering limited liability to its owners.
Accounts Payable, Current
Accounts payable
Accounts Payable, Current, Total
Debt Instrument [Axis]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Nonvested balance end of period (in dollars per share)
Nonvested balance beginning of period (in dollars per share)
Deferred Tax Assets, Valuation Allowance
Valuation allowances
Deferred Tax Assets, Valuation Allowance, Total
Operating Loss Carryforward Abstract
Operating Loss Carryforward [Abstract]
Operating Loss Carryforward [Abstract]
2028
2026
Costs and Expenses
Total costs and expenses
Range of Exercise Prices, upper limit (in dollars per share)
Share-Based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit
Other Receivables
Other
2024
2022
Auditor Location
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term
Estimated option term
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Pension and postretirement benefits
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax, Total
Entity Address, Address Line Two
Entity Address, Address Line Two
Schedule of Defined Benefit Plans Disclosures [Table]
Goodwill and other intangibles
Deferred Tax Assets, Goodwill and Intangible Assets
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Entity Small Business
Entity Shell Company
Increase (Decrease) in Operating Assets [Abstract]
Increase (decrease) in cash flows resulting from changes in:
Investment Type [Axis]
Unasserted Claim [Member]
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation
Tax withholdings on equity award vesting (in shares)
Initial rate
Defined Benefit Plan, Initial Health Care Cost Trend Rate
Defined Benefit Plan, Initial Health Care Cost Trend Rate
Earnings Per Share [Text Block]
Earnings Per Share
Revenues [Abstract]
Entity Address, Address Line One
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]
Amounts Recognized in the Consolidated Balance Sheets
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic
Undistributed earnings allocated to restricted shares
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic, Total
Other intangible assets - gross
Finite-Lived Intangible Assets, Gross
Finite-Lived Intangible Assets, Gross, Total
W. Sean O'Neil Attorney Member
W. Sean O'Neil Attorney [Member]
W. Sean O'Neil Attorney.
Subsequent Event Type [Domain]
Variable lease cost
Variable Lease, Cost
2026
2024
Taxes, Miscellaneous
Taxes, other than on income
Taxes, Miscellaneous, Total
Inventory
Deferred Tax Assets, Inventory
Exercise Price Range [Axis]
Number of other companies also named as Potentially Responsible Parties ("PRPs")
Site Contingency Number Of Companies Named As Potentially Responsible Parties Under Comprehensive Environmental Response Compensation And Liability Act
Number of companies also named as potentially responsible parties under comprehensive environmental response compensation and liability act.
Dividend yield
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Long-Term Debt, Type [Axis]
Net loss
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net earnings (loss)
Net earnings (loss)
2028
Lessee, Operating Lease, Liability, to be Paid, Year Five
Cenac Marine Services, LLC [Member]
Cenac Marine Services, LLC [Member]
Refers to the entity that is being acquired or purchased in a merger or acquisition.
Marine Transportation Equipment [Member]
Marine Transportation Equipment [Member]
Refers to the equipment related maritime transport is the shipment of goods (cargo) and people by sea and other waterways.
First Price Range [Member]
First Price Range [Member]
Represents information of first price range of option prices pertaining to options granted.
Carrying value
Carrying value
Long-Term Debt, Gross
Depreciation, Depletion and Amortization
Depreciation, Depletion and Amortization, Total
Depreciation and amortization
Product and Service [Axis]
Treasury Stock, Value, Acquired, Cost Method
Treasury stock purchases
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
Revenues [Abstract]
Title of 12(b) Security
Finite-Lived Intangible Assets, Accumulated Amortization
Accumulated amortization
HAWAII
HAWAII
Number of single customers accounting more than 10% of segment revenue
Number of major customers accounting more than ten percent of revenue
Number of single customers who account for more than 10 percent of segment revenues.
Investments [Domain]
Litigation Status [Domain]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent
Other - net
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent, Total
Treasury Stock Common [Member]
Treasury Stock, Common [Member]
Net Cash Provided by (Used in) Investing Activities [Abstract]
Cash flows from investing activities:
Litigation Status [Axis]
State and Local Jurisdiction [Member]
Louisiana [Member]
Long-Term Line of Credit
Credit facility, amount outstanding
Long-term Line of Credit, Total
Environmental Remediation Site [Axis]
Goodwill, Impairment Loss
Goodwill impairment charge
Impairment
Deferred Tax Expense from Stock Options Exercised
Tax benefit from stock options exercised
Long-Lived Tangible Asset [Domain]
Schedule of Allocation of Plan Assets [Table Text Block]
Asset Allocation
Increase (Decrease) in Inventories
Inventory
Increase (Decrease) in Inventories, Total
UK Protection & Indemnity Association [Member]
A mutual marine protection and indemnity organization that provides protection and indemnity insurance for third party liabilities and expenses arising from vessel operations.
Liability, Defined Benefit Plan, Current
Current liability
Defined Benefit Plan, Equity Securities, Non-US [Member]
International Equity Securities [Member]
Number of off-highway top distributors
Number of Top Distributors, Off-highway Engines
Refers to the number of top distributors of off-highway engines.
Average risk-free interest rate
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Share-Based Payment Arrangement [Text Block]
Stock Award Plans
Forfeited or expired (in dollars per share)
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Forfeited (in dollars per share)
Unpaid balance
unpaid balance
unpaid balance
Short-Term Debt
Short-term Debt, Total
Recognized amortization of major maintenance costs
Amortization of Major Maintenance Activity Costs
Amount of amortization expense attributable to major maintenance activity costs.
Retirement Plan Type [Axis]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Concentration Risk Type [Domain]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Granted (in dollars per share)
Document Type
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Line of Credit [Member]
Credit Line [Member]
Line Of Credit [Member]
Litigation Settlement, Amount Awarded from Other Party
Net Cash Provided by (Used in) Investing Activities
Net cash used in investing activities
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax
Net actuarial (gain) loss
Earnings (loss) available to Kirby common stockholders - basic
Net Income (Loss) Available to Common Stockholders, Basic
Income (loss) available to Kirby common stockholders - basic
Unsecured Debt [Member]
Deferred Tax Liabilities, Other
Other
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Forfeited (in shares)
Net cash used in financing activities
Net Cash Provided by (Used in) Financing Activities
Actuarial gain , Net Amount
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax
Defined Benefit Plan, Plan Assets, Category [Domain]
Entity Filer Category
Debt Instrument, Periodic Payment, Interest
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract]
Amounts recognized in accumulated other comprehensive income [Abstract]
Foreign currency translation adjustments
Foreign currency translation, Net Amount
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax
Property, Plant and Equipment, Planned Major Maintenance Activities, Policy [Policy Text Block]
Property, Maintenance and Repairs
Earnings (Loss) Before Taxes
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
Variable Rate [Axis]
Accrued Liabilities, Current [Abstract]
Accrued liabilities:
Operating Loss Carryforwards, Expiration Date
Expiration dates, operating loss carryforwards
Underlying Asset Class [Axis]
Oil and Gas [Member]
SBA Shipyard Site [Member]
SBA Shipyard Site [Member]
Refers to a location
Age of plan participants not impacted by pension plan amendment
Employee Pension Plan, Grandfathered Participants, Participant Age
The age of eligible participants of the employee pension plan who will be grandfathered and not be impacted by the amendment to the pension plan.
Defined Benefit Plan, Expected Future Benefit Payment, Year Three
Year three
Nonoperating Income (Expense)
Other income
Nonoperating Income (Expense), Total
Property, Plant and Equipment [Table]
Amortization of net actuarial (gain) loss, Income Tax (Provision) Benefit
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Settlement, Reclassification Adjustment from AOCI, Tax
Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) and settlement of defined benefit plan.
Average age
Finite-Lived Intangible Asset, Useful Life
Asset Impairment Charges
Impairments and other charges
Impairments and other charges
Asset Impairment Charges, Total
2.72% Senior Notes Due February 27, 2020 [Member]
Senior Notes Series A Due February 27, 2020 [Member]
Senior Notes Series A Due February Twenty Seven Two Thousand Twenty [Member]
Refers to the senior notes debt instruments.
Equity, Attributable to Parent
Total Kirby stockholders' equity
Stockholders' Equity Attributable to Parent, Beginning Balance
Stockholders' Equity Attributable to Parent, Ending Balance
Three point five one series b notes due january nineteen two thousand thirty three.
Three point Five One Series B Notes Due January Nineteen Two Thousand Thirty Three [Member]
3.51 Series B Notes Due January 19, 2023 [Member]
SOFR [Member]
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Documents Incorporated by Reference [Text Block]
Other Machinery and Equipment [Member]
Other Equipment [Member]
Net earnings (loss) attributable to Kirby
Net earnings (loss) attributable to Kirby
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment
Decrease in pension plan projected benefit obligation
Other comprehensive income , net of taxes:
Other Comprehensive Income (Loss), before Tax [Abstract]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Interest Expense
Interest expense
Interest Expense, Total
Standby Letters of Credit [Member]
Letters Of Credit [Member]
Income Tax Disclosure [Table]
A table disclosing the information about earnings (loss) before taxes on income.
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Net Periodic Benefit Cost
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent
State and local taxes, net of federal benefit
Fair Value Measurements
Fair Value Measurement, Policy [Policy Text Block]
Statement of Financial Position [Abstract]
Seafarers Pension Trust [Member]
Seafarers Pension Trust [Member]
Seafarers Pension Trust is a defined benefit plan providing retirees with a predetermined monthly retirement benefit upon reaching a specific age. The retirement benefit paid to a retiree is typically calculated using a formula which often employs years of credited service under the plan and salary information. The retirement benefit is typically payable to the employee upon attainment of their normal retirement age for the remainder of his/her lifetime. Benefits under this type of plan are often referred to as accrued benefits. This type of plan does not maintain individual accounts for employees.
Weighted Average Number of Shares Outstanding, Diluted (in Shares)
Weighted Average Number of Shares Outstanding, Diluted
Defined Benefit Plan, Accumulated Benefit Obligation
Accumulated benefit obligation at end of year
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Effective Income Tax Rate Reconciliation
Non Current Deferred Tax Assets And Liabilities Abstract
Non-current deferred tax assets and liabilities [Abstract]
Non Current Deferred Tax Assets And Liabilities [Abstract]
Impairment of Long-Lived Assets to be Disposed of
Impairments and other charges
Non-cash write-down
Non-cash pre-tax impairment charge
Credit Facility [Axis]
Effective Income Tax Rate Reconciliation, Percent
Effective income tax rate
Deferred Federal Income Tax Expense (Benefit)
Deferred
Cash paid for acquisition
Payments to Acquire Productive Assets
Capital expenditures
Capital expenditures
Payments to Acquire Productive Assets, Total
Percentage of costs relate to service costs for leased towing vessels
Percentage of Costs related to Service Costs Estimated
Estimated percentage of costs related to service costs and other non-lease components.
Percentage of costs relate to service costs for leased towing vessels
Weighted average remaining lease term
Operating Lease, Weighted Average Remaining Lease Term
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Net periodic benefit cost
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage
Income Tax Disclosure [Text Block]
Taxes on Income
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Outstanding at Period End (in dollars per share)
Outstanding at Period Start (in dollars per share)
Asset Impairment Charges [Text Block]
Impairments and Other Charges
Weighted average unvested restricted stock (in shares)
Weighted Average Number of Shares, Restricted Stock
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions
Retirement benefits
Earnings per Share
Schedule of Loss Per Share
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Disaggregation of Revenue [Line Items]
Income Tax Authority [Axis]
Undistributed earnings allocated to restricted shares
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted
Undistributed earnings allocated to restricted shares
Undistributed Earnings (Loss) Allocated to Participating Securities, Diluted, Total
Costs and Expenses [Abstract]
Costs and expenses:
Current Income Tax Expense (Benefit)
Current
Current
Total comprehensive income (loss), net of taxes
Total comprehensive income (loss), net of taxes
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Fair Value Hierarchy and NAV [Axis]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
Vested (in shares)
Vesting (in shares)
Fair value of stock options granted
Stock Issued During Period, Shares, New Issues
Employee-related Liabilities, Current
Employee compensation
Employee-related Liabilities, Current, Total
Initial rate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Initial Health Care Cost Trend Rate
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Initial Health Care Cost Trend Rate
Business Acquisition [Axis]
Income Tax Disclosure [Abstract]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Investment in affiliates
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures, Total
Defined Benefit Plan, Funded (Unfunded) Status of Plan
Funded status and amount recognized at end of year
Operating Loss Carryforwards
Operating loss carryforwards
Operating Loss Carryforwards, Total
Current year actuarial (gain) loss
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax