1001 - Document - Cover Page link:presentationLink link:definitionLink link:calculationLink 1002 - Statement - Consolidated Balance Sheets link:presentationLink link:definitionLink link:calculationLink 1003 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1004 - Statement - Consolidated Statements of Income link:presentationLink link:definitionLink link:calculationLink 1005 - Statement - Consolidated Statements of Comprehensive Income link:presentationLink link:definitionLink link:calculationLink 1006 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1007 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:definitionLink link:calculationLink 1008 - Statement - Consolidated Statements of Changes In Shareholders' Equity link:presentationLink link:definitionLink link:calculationLink 1009 - Statement - Consolidated Statements of Changes In Shareholders' Equity (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 999001 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure link:presentationLink link:definitionLink link:calculationLink 999002 - Disclosure - Significant Accounting Policies link:presentationLink link:definitionLink link:calculationLink 999003 - Disclosure - Other Comprehensive Income link:presentationLink link:definitionLink link:calculationLink 999004 - Disclosure - Investments link:presentationLink link:definitionLink link:calculationLink 999005 - Disclosure - Income Taxes link:presentationLink link:definitionLink link:calculationLink 999006 - Disclosure - Operating Property link:presentationLink link:definitionLink link:calculationLink 999007 - Disclosure - Retirement Plan link:presentationLink link:definitionLink link:calculationLink 999008 - Disclosure - Debt link:presentationLink link:definitionLink link:calculationLink 999009 - Disclosure - Leases link:presentationLink link:definitionLink link:calculationLink 999010 - Disclosure - Share-Based Payment Arrangements link:presentationLink link:definitionLink link:calculationLink 999011 - Disclosure - Equity link:presentationLink link:definitionLink link:calculationLink 999012 - Disclosure - Commitments and Contingencies link:presentationLink link:definitionLink link:calculationLink 999013 - Disclosure - Segment Information link:presentationLink link:definitionLink link:calculationLink 999014 - Disclosure - Change in Accounting Estimate for Self-Insured Claims link:presentationLink link:definitionLink link:calculationLink 999015 - Disclosure - Held for Sale Subsidiary link:presentationLink link:definitionLink link:calculationLink 999016 - Disclosure - Impairment of Software Assets link:presentationLink link:definitionLink link:calculationLink 999017 - Disclosure - Impairment of Equity Investment link:presentationLink link:definitionLink link:calculationLink 999018 - Disclosure - Recent Accounting Pronouncements link:presentationLink link:definitionLink link:calculationLink 999019 - Disclosure - Supply Chain Fraud Matter link:presentationLink link:definitionLink link:calculationLink 999020 - Disclosure - Significant Accounting Policies (Policies) link:presentationLink link:definitionLink link:calculationLink 999021 - Disclosure - Significant Accounting Policies (Tables) link:presentationLink link:definitionLink link:calculationLink 999022 - Disclosure - Other Comprehensive Income (Tables) link:presentationLink link:definitionLink link:calculationLink 999023 - Disclosure - Investments (Tables) link:presentationLink link:definitionLink link:calculationLink 999024 - Disclosure - Income Taxes (Tables) link:presentationLink link:definitionLink link:calculationLink 999025 - Disclosure - Held for Sale Subsidiary (Tables) link:presentationLink link:definitionLink link:calculationLink 999026 - Disclosure - Operating Property (Tables) link:presentationLink link:definitionLink link:calculationLink 999027 - Disclosure - Leases (Tables) link:presentationLink link:definitionLink link:calculationLink 999028 - Disclosure - Share-Based Payment Arrangements (Tables) link:presentationLink link:definitionLink link:calculationLink 999029 - Disclosure - Segment Information (Tables) link:presentationLink link:definitionLink link:calculationLink 999030 - Disclosure - Change in Accounting Estimate for Self-Insured Claims (Tables) link:presentationLink link:definitionLink link:calculationLink 999031 - Disclosure - Significant Accounting Policies - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999032 - Disclosure - Schedule Of Revenue By Major Customers By Reporting Segments (Detail) link:presentationLink link:definitionLink link:calculationLink 999033 - Disclosure - Summary of Activity in Allowance for Doubtful Accounts (Detail) link:presentationLink link:definitionLink link:calculationLink 999034 - Disclosure - Other Comprehensive Income - Components of and Changes in Accumulated Other Comprehensive (loss) Income, Net of Related Income Taxes (Detail) link:presentationLink link:definitionLink link:calculationLink 999035 - Disclosure - Investments - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999036 - Disclosure - Investments - Amortized Cost and Fair Value of Available-for-Sale Investments (Detail) link:presentationLink link:definitionLink link:calculationLink 999037 - Disclosure - Investments - Schedule of Unrealized Loss on Available-for-Sale Investments (Detail) link:presentationLink link:definitionLink link:calculationLink 999038 - Disclosure - Income Taxes - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999039 - Disclosure - Schedule of Provision for Income Taxes (Detail) link:presentationLink link:definitionLink link:calculationLink 999040 - Disclosure - Schedule of Provision for Income Taxes on Income Before Income Taxes (Detail) link:presentationLink link:definitionLink link:calculationLink 999041 - Disclosure - Schedule of Deferred Tax Assets and Liabilities (Detail) link:presentationLink link:definitionLink link:calculationLink 999042 - Disclosure - Schedule of Income Taxes Calculated on Income from Before Income Taxes and Provision for Income Taxes (Detail) link:presentationLink link:definitionLink link:calculationLink 999043 - Disclosure - Schedule for Gross Unrecognized Tax Benefits (Detail) link:presentationLink link:definitionLink link:calculationLink 999044 - Disclosure - Schedule of Income Taxes (Detail) link:presentationLink link:definitionLink link:calculationLink 999045 - Disclosure - Operating Property - Schedule of Operating Property (Detail) link:presentationLink link:definitionLink link:calculationLink 999046 - Disclosure - Operating Property - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999047 - Disclosure - Retirement Plan - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999048 - Disclosure - Debt - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999049 - Disclosure - Leases - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999050 - Disclosure - Leases - Components of Lease Cost for Finance Leases and Operating Leases (Detail) link:presentationLink link:definitionLink link:calculationLink 999051 - Disclosure - Leases - Classification on our Consolidated Balance Sheet (Detail) link:presentationLink link:definitionLink link:calculationLink 999052 - Disclosure - Leases - Undiscounted Cash Flows for the Finance and Operating Leases (Detail) link:presentationLink link:definitionLink link:calculationLink 999053 - Disclosure - Leases - Undiscounted Cash Flows for the Finance and Operating Leases (Parenthetical) (Detail) link:presentationLink link:definitionLink link:calculationLink 999054 - Disclosure - Leases - Weighted Average Remaining Lease Term and the Weighted Average Discount Rate for Finance and Operating leases (Detail) link:presentationLink link:definitionLink link:calculationLink 999055 - Disclosure - Share-Based Payment Arrangements - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999056 - Disclosure - Amounts Recognized in Financial Statements with Respect to Plans (Detail) link:presentationLink link:definitionLink link:calculationLink 999057 - Disclosure - Schedule of Information on Restricted Stock Units (Detail) link:presentationLink link:definitionLink link:calculationLink 999058 - Disclosure - Schedule of Information on Non - Vested Restricted Stock Units (Detail) link:presentationLink link:definitionLink link:calculationLink 999059 - Disclosure - Summary of Information Regarding Stock Options (Detail) link:presentationLink link:definitionLink link:calculationLink 999060 - Disclosure - Equity - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999061 - Disclosure - Commitments and Contingencies - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999062 - Disclosure - Segment Information - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999063 - Disclosure - Held for Sale Subsidiary - Disclosure of Long Lived Assets and Liabilities Held for Sale (Detail) link:presentationLink link:definitionLink link:calculationLink 999064 - Disclosure - Held for Sale Subsidiary - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999065 - Disclosure - Information Regarding Reportable Business Segments (Detail) link:presentationLink link:definitionLink link:calculationLink 999066 - Disclosure - Information Regarding Reportable Business Segments (Parenthetical) (Detail) link:presentationLink link:definitionLink link:calculationLink 999067 - Disclosure - Change in Accounting Estimate for Self-Insured Claims - Effect of Increase in Cost of Insurance and Claims (Detail) link:presentationLink link:definitionLink link:calculationLink 999068 - Disclosure - Change in Accounting Estimate for Self-Insured Claims - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999069 - Disclosure - Impairment of Software Assets - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999070 - Disclosure - Impairment of Equity Investment - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 999071 - Disclosure - Supply Chain Fraud Matter - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink Cover [Abstract] Document Period End Date Entity Current Reporting Status Entity Filer Category Entity Registrant Name Entity Interactive Data Current Entity Common Stock, Shares Outstanding Entity File Number Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Address, Address Line One Entity Address, City or Town Entity Address, Postal Zip Code City Area Code Local Phone Number Document Transition Report Entity Shell Company Entity Small Business Entity Emerging Growth Company Trading Symbol Title of 12(b) Security Security Exchange Name Entity Address, State or Province Document Type Amendment Flag Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Central Index Key Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Public Float Document Annual Report ICFR Auditor Attestation Flag Auditor Firm ID Auditor Name Auditor Location Document Financial Statement Error Correction [Flag] Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Statement [Line Items] Statement [Line Items] Amortization of right-of-use assets Assets [Abstract] ASSETS Assets, Current [Abstract] Current Assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Short-term Investments Short-term investments Receivables, Net, Current Trade accounts receivable, less allowance of $12,490 and $12,904 Other Receivables Other receivables, including advances to independent contractors, less allowance of $18,759 and $17,812 Other Assets, Current Other current assets Assets, Current Total current assets Disposal Group, Including Discontinued Operation, Assets, Current Assets held for sale Total assets held for sale Property, Plant and Equipment, Net Operating property, less accumulated depreciation and amortization of $473,642 and $456,547 Total operating property, net Goodwill Goodwill Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities, Current [Abstract] Current Liabilities Bank Overdrafts Cash overdraft Accounts Payable, Current Accounts payable Finance Lease, Liability, Current Current maturities of long-term debt Current maturities of long-term debt Self Insurance Reserve, Current Insurance claims Dividends Payable, Current Dividends payable Other Liabilities, Current Other current liabilities Liabilities, Current Total current liabilities Disposal Group, Including Discontinued Operation, Liabilities Liabilities held for sale Total liabilities held for sale Stockholders' Equity Attributable to Parent [Abstract] Shareholders' Equity Common Stock, Value, Issued Common stock, $0.01 par value, authorized 160,000,000 shares, issued 68,590,708 and 68,559,269 shares Additional Paid in Capital, Common Stock Additional paid-in capital Cumulative adjustment to retained earnings Retained earnings Treasury Stock, Value Cost of 34,531,982 and 33,243,196 shares of common stock in treasury Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Cumulative translation loss of foreign entities held for sale Stockholders' Equity Attributable to Parent Total shareholders' equity Beginning Balance Ending Balance Self Insurance Reserve, Noncurrent Insurance claims Deferred Income Taxes and Other Liabilities, Noncurrent Deferred income taxes and other noncurrent liabilities Liabilities and Equity Total liabilities and shareholders' equity Finance Lease, Liability, Noncurrent Long-term debt, excluding current maturities Long-term debt, excluding current maturities Allowance for Doubtful Accounts Receivable, Current Allowance on trade accounts receivable Allowance for Doubtful Accounts, Premiums and Other Receivables Allowance on other receivables Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated depreciation and amortization on operating property Less accumulated depreciation and amortization Common Stock, Par or Stated Value Per Share Common stock, par value Common Stock, Shares Authorized Common stock, authorized shares Common Stock, Shares, Issued Common stock, issued shares Treasury Stock, Common, Shares Treasury stock, shares Treasury Stock Ending Balance (in shares) Treasury Stock Beginning Balance (in shares) Income Statement [Abstract] Costs and Expenses [Abstract] Costs and expenses: Purchased Transportation Costs Purchased transportation The cost of purchased transportation and transportation-related services of third party capacity providers of various modes for the carriage of customer freight during the period. Sales Commissions and Fees Commissions to agents Other Cost and Expense, Operating Other operating costs, net of gains on asset sales/dispositions Operating Insurance and Claims Costs, Production Insurance and claims Selling, General and Administrative Expense Selling, general and administrative Depreciation, Depletion and Amortization, Nonproduction Depreciation and amortization Depreciation and amortization Costs and Expenses Total costs and expenses Asset Impairment Charges Impairment of intangible and other assets Impairment of intangible and other assets Revenue from Contract with Customer, Excluding Assessed Tax Revenue External revenue Interest Income, Operating Investment income Operating Income (Loss) Operating income Operating income Operating income Interest And Debt Income Expense Interest and debt expense (income) Interest and debt expense (income) Interest and debt (income) expense. Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income before income taxes Income before income taxes Income before income taxes Income Tax Expense (Benefit) Income taxes Total income taxes Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Net income Earnings Per Share, Basic Basic earnings per share Earnings Per Share, Diluted Diluted earnings per share Common Stock, Dividends, Per Share, Declared Dividends per common share Weighted Average Number of Shares Outstanding, Basic Average basic shares outstanding Weighted Average Number of Shares Outstanding, Diluted Average diluted shares outstanding Statement of Comprehensive Income [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Unrealized holding gains on available-for-sale investments, net of tax expense of $660, $604 and $942 Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation gains (losses) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive income (loss) Other comprehensive income (loss) Net income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income Other Comprehensive Income (Loss), Securities, Available-for-sale, Tax Unrealized holding gains on available-for-sale investments, net of tax expense Statement of Cash Flows [Abstract] Net Cash Provided by (Used in) Financing Activities [Abstract] FINANCING ACTIVITIES Proceeds from (Repayments of) Bank Overdrafts Decrease in cash overdraft Payments of Dividends Dividends paid Proceeds from Stock Options Exercised Proceeds from exercises of stock options Payments Related to Tax Withholding for Share-based Compensation Taxes paid in lieu of shares issued related to stock-based compensation plans Payments for Repurchase of Common Stock Purchases of common stock Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities Principal payments on finance lease obligations Net Cash Provided by (Used in) Financing Activities NET CASH USED BY FINANCING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] INVESTING ACTIVITIES Proceeds from Sale and Maturity of Marketable Securities Sales and maturities of investments Payments to Acquire Marketable Securities Purchases of investments Payments to Acquire Property, Plant, and Equipment Purchases of operating property Proceeds from Sale of Property, Plant, and Equipment Proceeds from sales of operating property Net Cash Provided by (Used in) Investing Activities NET CASH USED BY INVESTING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] OPERATING ACTIVITIES Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Receivables (Increase) decrease in trade and other accounts receivable Increase (Decrease) in Other Operating Assets Increase in other assets Increase (Decrease) in Accounts Payable Decrease in accounts payable Increase (Decrease) in Other Operating Liabilities (Decrease) increase in other liabilities Increase (Decrease) in Insurance Liabilities Increase (decrease) in insurance claims Amortization of Debt Issuance Costs Non-cash interest charges Provision for Doubtful Accounts Provisions for losses on trade and other accounts receivable Gain (Loss) on Disposition of Property Plant Equipment Gains on sales/disposals of operating property Increase (Decrease) in Deferred Income Taxes Deferred income taxes, net Share-based Compensation Stock-based compensation Total cost of the Plans during the period Net Cash Provided by (Used in) Operating Activities NET CASH PROVIDED BY OPERATING ACTIVITIES Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Increase Decrease In Cash And Cash Equivalents Classified As Assets Held For Sale Less: Net change in cash and cash equivalents classified as assets held for sale Increase decrease in cash and cash equivalents classified as assets held for sale. Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect Including Cash Cash Equivalents Classified As Assets Held For Sale (Decrease) increase in cash and cash equivalents, including cash and cash equivalents classified as assets held for sale Cash cash equivalents restricted cash and restricted cash equivalents period increase decrease including exchange rate effect including cash cash equivalents classified as assets held for sale. Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Effect of exchange rate changes on cash and cash equivalents Statement of Stockholders' Equity [Abstract] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis]