Amendment Flag Current Fiscal Year End Date Document Period End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type Award Type [Axis] ASU 2015-17 [Member] Accounts receivable: Accounts Receivable, Net, Current [Abstract] Accounts payable Trade - less allowance for doubtful accounts Accounts Receivable, Net, Current Accrued liabilities Income taxes payable Accrued Income Taxes, Current Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated other comprehensive income - net Accumulated Other Comprehensive Income (Loss), Net of Tax Additional paid-in capital Adjustments to reconcile net earnings to net cash provided by operations: Adjustments for New Accounting Pronouncements [Axis] Compensation cost Allocated Share-based Compensation Expense Amortization of debt issuance costs Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Total assets Total assets Assets ASSETS Assets [Abstract] Current assets: Total current assets Assets, Current BASIS FOR PREPARATION OF THE CONDENSED FINANCIAL STATEMENTS Basis of Accounting [Text Block] Business Acquisition [Axis] Stock consideration through issuance of company common stock Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Purchase price Business Combination, Consideration Transferred ACQUISITIONS [Abstract] Business Acquisition [Line Items] ACQUISITIONS Business Combination Disclosure [Text Block] Marine transportation Cargo and Freight Revenue Cash and cash equivalents Cash and cash equivalents, beginning of year Cash and cash equivalents, end of period Decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Contingencies and commitments Commitments and Contingencies CONTINGENCIES [Abstract] Common stock, shares issued (in shares) Common stock, shares authorized (in shares) Common stock, $.10 par value per share. Authorized 120,000,000 shares, issued 59,776,000 shares Common Stock, Value, Issued Common stock, par value per share (in dollars per share) RETIREMENT PLANS [Abstract] Comprehensive income attributable to Kirby Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income, net of taxes Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Consolidation Items [Axis] Consolidation Items [Domain] Costs and expenses: Costs and Expenses [Abstract] Total costs and expenses Costs and Expenses Credit Facility [Axis] Credit Facility [Domain] Cumulative effect on retained earnings Cumulative Effect on Retained Earnings, Tax State and local Current State and Local Tax Expense (Benefit) Current Current Federal Tax Expense (Benefit) Debt Instrument [Line Items] LONG-TERM DEBT [Abstract] Schedule of Long-term Debt Instruments [Table] Carrying amount of debt Basis spread on variable rate Estimated fair value of outstanding debt Performance Bonds [Member] Debt Securities Payable [Member] Tax benefit from stock options exercised Deferred Tax Expense from Stock Options Exercised Deferred Deferred Federal Income Tax Expense (Benefit) Deferred revenues Provision for deferred income taxes Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Amortization of actuarial (gain) loss Defined Benefit Plan, Amortization of Gains (Losses) Defined Benefit Plan Disclosure [Line Items] Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Interest cost Defined Benefit Plan, Interest Cost Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost Decrease in pension plan projected benefit obligation Defined Benefit Plan, Plan Amendments Defined Benefit Plans and Other Postretirement Plans [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Service cost Defined Benefit Plan, Service Cost Components of net periodic benefit cost [Abstract] Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Depreciation and amortization STOCK AWARD PLANS Disclosure of Compensation Related Costs, Share-based Payments [Text Block] STOCK AWARD PLANS [Abstract] Net earnings per share attributable to Kirby common stockholders [Abstract] Net earnings per share attributable to Kirby common stockholders: Basic (in dollars per share) Basic (in dollars per share) Diluted (in dollars per share) Diluted (in dollars per share) EARNINGS PER SHARE Earnings Per Share [Text Block] EARNINGS PER SHARE [Abstract] Weighted average period of recognition in years Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Stock Options [Member] Income tax benefit Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Unrecognized compensation cost related to unvested awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized FAIR VALUE MEASUREMENTS [Abstract] FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Federal [Abstract] Federal Income Tax Expense (Benefit), Continuing Operations [Abstract] Loss (gain) on disposition of assets Gain (loss) on disposition of assets Goodwill Goodwill Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Axis] Issued guaranties Guarantor Obligations, Maximum Exposure, Undiscounted Guarantor Obligations [Line Items] Intersegment Eliminations [Member] TAXES ON INCOME [Abstract] Earnings before taxes on income - United States Earnings before taxes on income Segment profit (loss) Loss from other segment Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest TAXES ON INCOME Total Provision for taxes on income Provision for taxes on income Income Tax Expense (Benefit) CONDENSED STATEMENTS OF EARNINGS (Unaudited) [Abstract] Income taxes paid Increase (decrease) in provision for taxes on income Increase (decrease) in cash flows resulting from changes in operating assets and liabilities, net Increase (Decrease) in Operating Capital Dilutive effect of stock options (in shares) Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Interest expense Interest Expense Additional interest expense Interest paid Details of inventories [Abstract] Inventory, Net [Abstract] Inventories - net Inventory, Net, Total Inventory, Net Finished goods INVENTORIES Inventory Disclosure [Text Block] INVENTORIES [Abstract] Work in process Investment in affiliates Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures LIBOR [Member] Total liabilities and equity Liabilities and Equity LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Total current liabilities Liabilities, Current Current liabilities: Total long-term liabilities Liabilities, Noncurrent Credit facility, expiration date Line of Credit Facility, Expiration Date Credit facility, borrowing limit Line of Credit Facility, Maximum Borrowing Capacity LONG-TERM DEBT Long-term Debt [Text Block] Long-term debt - less current portion Long-term Debt, Excluding Current Maturities Loss Contingencies [Table] Loss Contingencies [Line Items] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Other [Member] Maximum [Member] Noncontrolling interests Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from financing activities: Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Cash flows from operating activities: Net earnings attributable to Kirby Net earnings attributable to Kirby Net Income (Loss) Attributable to Parent Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Net earnings attributable to noncontrolling interests Less: Net earnings attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Income available to Kirby common stockholders - diluted Net Income (Loss) Available to Common Stockholders, Diluted Income available to Kirby common stockholders - basic Net Income (Loss) Available to Common Stockholders, Basic New Accounting Pronouncements or Change in Accounting Principle [Table] ACCOUNTING STANDARDS ADOPTIONS ACCOUNTING STANDARDS ADOPTIONS [Abstract] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Fair value of property transferred in acquisition Noncash or Part Noncash Acquisition, Value of Assets Acquired Other income (expense) Other income (expense) Number of reportable segments Number of Reportable Segments Number of states having branches Number of States in which Entity Operates Reporting Segments [Member] Operating Segments [Member] Operating income Operating Income (Loss) Total other comprehensive income (loss), net of taxes Other Comprehensive Income (Loss), Net of Tax Amortization of net actuarial loss, Income Tax (Provision) Benefit Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Tax Actuarial gains (losses), Income Tax (Provision) Benefit Amortization of net actuarial loss, Net Amount Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), Net of Tax Actuarial gains (losses), Gross Amount Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax Amortization of net actuarial loss, Gross Amount Actuarial gains (losses), Net Amount Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), Net of Tax Pension and postretirement benefits Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Total other comprehensive income (loss), Gross Amount Other Comprehensive Income (Loss), before Tax Other Other Noncash Income (Expense) OTHER COMPREHENSIVE INCOME Other Comprehensive Income, Noncontrolling Interest [Text Block] Details of "Other" total assets [Abstract] OTHER COMPREHENSIVE INCOME [Abstract] Pension and postretirement benefits [Abstract] Total other comprehensive income (loss), Income Tax (Provision) Benefit Other Comprehensive Income (Loss), Tax Other assets Other Assets, Noncurrent Other comprehensive income (loss), net of taxes: Total other assets Other Assets Other long-term liabilities Other Postretirement Benefits [Member] Other Postretirement Benefits [Member] Other Other Receivables Payments related to tax withholding for share-based compensation Payments Related to Tax Withholding for Share-based Compensation Cash paid for acquisition Payments to Acquire Businesses, Gross Acquisitions of businesses and marine equipment Payments to Acquire Businesses, Net of Cash Acquired Purchase of treasury stock Payments for Repurchase of Common Stock Acquisition of noncontrolling interests Payments to Noncontrolling Interests Capital expenditures Payments to Acquire Productive Assets RETIREMENT PLANS Pension and Other Postretirement Benefits Disclosure [Text Block] Pension Benefits [Member] Pension Plan [Member] Plan Name [Domain] Plan Name [Domain] Plan Name [Axis] Prepaid expenses and other current assets Other Borrowings (payments) on bank credit facilities, net Proceeds from (Repayments of) Lines of Credit Proceeds from disposition of assets Proceeds from exercise of stock options Net earnings Net earnings Property, Plant and Equipment, Type [Domain] Property and equipment - net Property, Plant and Equipment, Net Property and equipment Property, Plant and Equipment, Gross Property, Plant and Equipment, Type [Axis] Range [Axis] Range [Domain] Restricted Stock [Member] Retained earnings Total revenues Revenues Revenues: Revolving Credit Facility [Member] Aggregate Intrinsic Value, Options Exercisable Fair value of options vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Weighted Average Exercise Price, Options Exercisable (in dollars per share) Weighted Average Remaining Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Estimated option term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Intrinsic value of restricted stock vesting Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested Weighted Average Exercise Price, Options Outstanding (in dollars per share) Schedule of Details of Inventories Summary of Stock Option Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Earnings Before Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Summary of Stock Option Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Changes in Other Comprehensive Income Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] Components of Basic and Diluted Earnings per Share Compensation Cost Breakdown in Statement of Earnings Summary of Restricted Stock Award Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Components of Net Periodic Benefit Cost Schedule of Defined Benefit Plans Disclosures [Table Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Guarantor Obligations [Table] Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Segment Reporting Information, by Segment [Table] Summary of Outstanding and Exercisable Stock Options Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Revenues [Abstract] Segment Reporting Information, Revenue for Reportable Segment [Abstract] SEGMENT DATA Segment Reporting Disclosure [Text Block] Segments [Domain] SEGMENT DATA [Abstract] Segment Reporting Information [Line Items] Selling, general and administrative Weighted Average Grant Date Fair Value Per Share [Abstract] Amortization of unearned share-based compensation Share-based Compensation Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Forfeited (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 Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Granted (in dollars per share) Unvested Restricted Stock Award Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement By Share-Based Payment Award [Line Items] Forfeited (in dollars per share) Term of grant Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Granted (in shares) Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Nonvested balance beginning of period (in dollars per share) Nonvested balance end of period (in dollars per share) 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 shares) Nonvested balance beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Average risk-free interest rate Weighted Average Exercise Price [Abstract] Intrinsic value of stock options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Vested (in dollars per share) Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Fair Value Assumptions [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Dividend yield Fair value of restricted stock vested Shares available for future grants (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Stock price volatility Outstanding at Period End (in dollars per share) Outstanding at Period Start (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Outstanding at Period Start (in shares) Outstanding at Period End (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Equity Award [Domain] Aggregate Intrinsic Value, Options Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Outstanding Non-Qualified or Nonincentive Stock Awards [Roll Forward] Fair value of stock options granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Number Outstanding (in shares) Number Exercisable (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Range of Exercise Prices, upper limit (in dollars per share) Range of Exercise Prices, lower limit (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Exercise Price Range [Axis] Letters Of Credit [Member] Standby Letters of Credit [Member] CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) [Abstract] CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract] CONDENSED BALANCE SHEETS (Unaudited) [Abstract] Segments [Axis] Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Stock Appreciation Rights [Member] Stock Appreciation Rights (SARs) [Member] Equity: Kirby stockholders' equity: Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total Kirby stockholders' equity Stockholders' Equity Attributable to Parent SERP [Member] Supplemental Employee Retirement Plan [Member] Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Taxes, other than on income Taxes, Miscellaneous Treasury stock, shares (in shares) Treasury stock - at cost, 5,770,000 shares at June 30, 2017 and 5,921,000 at December 31, 2016 Treasury Stock, Value Type of Adoption [Domain] Underlying Asset Class [Axis] Underlying Asset Class [Domain] Collision with M/S Summer Wind [Member] 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, Basic Variable Rate [Domain] Variable Rate [Axis] Weighted average common stock outstanding - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Weighted average common stock outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted average unvested restricted stock (in shares) Weighted Average Number of Shares, Restricted Stock Refers to current deferred tax assets which have been reclassified in the consolidated balance sheet from current deferred income taxes asset to noncurrent deferred income taxes liability. Reclassification Of Deferred Income Taxes Reclassification of deferred income taxes Amount of the effect of a change in accounting principle on net cash provided by operating activities and net cash used in financing activities. New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Activities and Financing Activities Effect of change on operating activities and financing activities Accounting Standards Update 2016-09 Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. Accounting Standards Update 2016-09 [Member] ASU 2016-09 [Member] BASIS FOR PREPARATION OF THE CONDENSED FINANCIAL STATEMENTS [Abstract] Tabular disclosure of the profit or loss and total assets for other segment information. Schedule Of Other Segment Reporting Information By Segment [Text Block] Schedule of Other Segment Reporting Information Current and future cash outflow to pay for purchases of fixed assets that have occurred. Capital Expenditures Incurred, Paid and Not yet Paid Capital expenditures included in accounts payable 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. Amortization of Major Maintenance Costs Amortization of major maintenance costs Overhaul and repair of medium-speed and high-speed diesel engines, reduction gear repair, and sale of related parts and accessories for customers in the marine, power generation and railroad industries. Revenue Repair And Sale Of Diesel Engine And Related Parts Diesel engine services 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. Costs Of Sales And Operating Expenses Costs of sales and operating expenses Refers to percentage of pension plan defined benefit plan cost increase limit during the period. Pension Plan Defined Benefit Plan Cost Increase Limit Percentage Pension plan defined benefit plan cost increase limit percentage 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. Employee Pension Plan, Grandfathered Participants, Participant Age Age of plan participants not impacted by pension plan amendment 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. Employee Pension Plan, Grandfathered Participants, Participant Service Period Who is Fifty Years Old Service period of participants who are age fifty not impacted by pension plan amendment 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. Employee Pension Plan, Grandfathered Participants, Service Period Service period of participants not impacted by pension plan amendment Provision for taxes on income [Abstract] Provision for taxes on income [Abstract] Undistributed Earnings Reallocated To Restricted Shares. Undistributed Earnings Reallocated To Restricted Shares Undistributed earnings reallocated to restricted shares Shares Outstanding [Abstract] Shares Outstanding [Abstract] 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. Weighted average common stock issued and outstanding Weighted average common stock issued and outstanding (in shares) Number of vessels damaged in collision resulting in fuel oil discharge. Number of vessels damaged in collision resulting in fuel oil discharge 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. Term of Instrument Under Guarantor Obligations Guarantor obligations, expiration period Refers to the number of maritime (seagoing) vessels. Number of Maritime Vessels Number of vessels involved in collision Assets other than goodwill that contribute to the future cash flows of both the cash-generating unit under review and other cash-generating units. General corporate assets Other segment disclosure [Abstract] Other segment disclosures [Abstract] Refers to amount of general corporate expenses. General corporate expenses General corporate expenses Diesel engine 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. Diesel Engine Services [Member] Diesel Engine Services [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. Marine Transportation [Member] Marine Transportation [Member] Represents to director plan of the equity-based compensation arrangement plan. Director Plan [Member] Director Plan [Member] Represents to employee plan of the equity-based compensation arrangement plan. Employee Plan [Member] Employee Stock Award Plan [Member] Document and Entity Information [Abstract] Represents information of third price range of option prices pertaining to options granted. Third Price Range [Member] Third Price Range [Member] Represents information of second price range of option prices pertaining to options granted. Second Price Range [Member] Second Price Range [Member] Represents information of first price range of option prices pertaining to options granted. First Price Range [Member] First Price Range [Member] Represents information of fourth price range of option prices pertaining to options granted. Fourth Price Range [Member] Fourth 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. Total Exercise Price Range [Member] Full Exercise Price Range [Member] Outstanding and Exercisable Stock options [Abstract] 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 Outstanding Options [Abstract] Options Outstanding [Abstract] Employee Stock Award Plan [Abstract] Stock Award Plan Information [Abstract] Restricted Stock Award Activity [Abstract] Share based Compensation Plans Combined Disclosure [Abstract] Tax benefit from restricted stock vesting during the reporting period. Tax Benefit From Restricted Stock Vesting Tax benefit from restricted stock vesting Refers to amount of fair value of options granted during the period. Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Fair Value Fair value of stock options granted Refers to the engine power of a maritime vessel as measured in horsepower. Horsepower of Maritime Vessel Horsepower of inland towboats Refers to a diesel-powered or steam-powered boat used especially on inland waterways to push groups of barges lashed to it in front or on one side or both. Inland Towboats [Member] Inland Towboats [Member] Refers to the barrel tank barges. Barrel Tank Barges [Member] Barrel Tank Barges [Member] Refers to the number of branches the entity operates. Number of Branches Number of branches Refers to the carrying capacity of tank barges as measured in number of barrels. Tank Barge Barrel Capacity Tank barge barrel capacity The average age of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. Property, Plant and Equipment, Average Age Average age of property Refers to the entity that is being acquired or purchased in a merger or acquisition. Stewart & Stevenson LLC [Member] Refers to the entity "Undisclosed Competitor" from whom assets are acquired or purchased in a merger or acquisition. Undisclosed Competitor [Member] Refers to pressure tank barges. Pressure Tank Barges [Member] Pressure Tank Barges [Member] Refers to inland tank barges. Inland Tank Barges [Member] Inland Tank Barges [Member] Refers to the number of maritime (seagoing) vessels acquired. Number of Maritime Vessels Acquired Number of maritime vessels acquired Amount of increase borrowing commitment available under the revolving credit facility and term loans. Line Of Credit Facility Increase In Aggregate Commitments Line of credit, increase in aggregate commitments