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Remaining principal amount Remaining principal amount Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Common stock, shares authorized Common Stock, Shares Authorized Product and Service Product and Service [Axis] Document Fiscal Period Focus Document Fiscal Period Focus Notes interest Debt Instrument, Interest Rate, Stated Percentage Entity Shell Company Entity Shell Company Cash and Cash Equivalents, at Carrying Value, Ending Balance Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Cash and Cash Equivalent New stock repurchase program. New Stock Repurchase Program [Member] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Entity Filer Category Entity Filer Category Common Stock, Value, Outstanding Common stock - $0.10 par value, 560,000,000 shares authorized, 208,146,920 and 208,556,788 shares outstanding at March 31, 2026 and December 31, 2025, respectively Total liabilities and shareholders’ equity Liabilities and Equity Debt Instrument [Line Items] Debt Instrument [Line Items] Current maturities of long-term debt Long-Term Debt, Current Maturities Long-term Debt, Current Maturities, Total Less: Current maturities Common stock split description Stockholders' Equity Note, Stock Split Payment for Initial delivery Treasury Stock, Common, Value General supplies and expenses Other Selling And General Expense Costs related to selling products and services, as well as other general and administrative expenses not separately disclosed on the income statement. Line of Credit Facility Accordion Line Of Credit Facility Accordion Amount of additional borrowing capacity under an accordion feature within the credit agreement. Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Capital in excess of par value Additional Paid in Capital, Common Stock Stock repurchase program remaining available and uncommitted repurchase amount. Stock Repurchase Program Remaining Available And Uncommitted Repurchase Amount Stock repurchase program remaining available and uncommitted repurchase amount Employee Benefit Costs Employee benefit costs. Employee benefit costs Significant Accounting Policies Significant Accounting Policies [Text Block] Share Repurchase Program Share Repurchase Program [Axis] Maturity Date Description Debt Instrument, Maturity Date, Description Disaggregation Of Revenue [Table] Disaggregation of Revenue [Table] Property and equipment: Property, Plant and Equipment, Net [Abstract] Senior notes Senior Notes Senior Notes, Total Senior note Earnings Per Share, Basic, Total Basic Earnings Per Share, Basic Repayments of Long-Term Debt, Total Repayments of Long-Term Debt Principal payments under debt agreements Principal payments under long-term debt agreements Principal payments Direct Communications and Utilities Costs, Total Communications and utilities Direct Communications and Utilities Costs Total current liabilities Liabilities, Current Adjustments to reconcile net income to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Revenue, Major Customer [Line Items] Share Repurchase Program Share Repurchase Program [Domain] Stock Repurchase Program Stockholders' Equity, Policy [Policy Text Block] Consolidation Items [Domain] Shareholders' equity: Equity, Attributable to Parent [Abstract] Entity Small Business Entity Small Business Recent Legislation [Policy Text Block] Disclosure of recent legislation. Recent Legislation Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Total Retained earnings Retained Earnings (Accumulated Deficit) Business Nature of Operations [Text Block] Taxes paid in exchange for shares withheld Restricted Stock, Value, Shares Issued Net of Tax Withholdings Share Repurchase Programs [Member] Stock Repurchase Programs [Member] Stock repurchase programs. Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases Paid in Three Equal Annual Installments [Member] Paid in three equal annual installments member. Paid in Three Equal Annual Installments [Member] Dividends paid Payments of Dividends, Total Dividends paid Payments of Dividends Amendment Flag Amendment Flag Product and Service Product and Service [Domain] LIABILITIES AND SHAREHOLDERS’ EQUITY Liabilities and Equity [Abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description Common Stock [Member] Common Stock [Member] Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less: Accumulated depreciation Forward contract for accelerated share repurchases Forward contract for accelerated share repurchases Accelerated Shares Repurchase Forward Contract Accelerated shares repurchase forward contract. Entity Address, Address Line One Entity Address, Address Line One Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Earnings per share: Earnings Per Share [Abstract] Unsecured Senior Note Due January 3, 2021 [Member] Unsecured Senior Note January Three Two Thousand Twenty One [Member] Unsecured senior note January 3, 2021. Debt Instrument, Redemption, Period [Axis] Document Type Document Type Line of Credit Facility, Increase in Borrowing Capacity Line of credit facility, increase in borrowing capacity. Line of credit facility, increase in borrowing capacity Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative [Domain] Entity Central Index Key Entity Central Index Key Customer receivables, allowances Accounts Receivable, Allowance for Credit Loss, Current Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Increase (decrease) in cash and cash equivalents Subsequent Event Type [Domain] Aggregate amount on promissory notes issued Aggregate Principal Amount Of Senior Notes Aggregate principal amount of senior notes available for issuance through March 22, 2026. Total Shares Delivered Total Shares Delivered Stock repurchased and retired during period, shares Share repurchases, including transaction costs, shares Share repurchases, including transaction costs, shares Summary of Accelerated Repurchase Activity Accelerated Share Repurchases [Table Text Block] Common stock, par value Common Stock, Par or Stated Value Per Share Operating Costs and Expenses, Total Operating supplies and expenses Operating Costs and Expenses Letter of Credit Fee in Percentage Letter Of Credit Fee In Percentage The effective interest rate during the reporting period on the outstanding letters of credit. Debt Disclosure [Abstract] Accrued Liabilities, Current, Total Other accrued liabilities Accrued Liabilities, Current Current Fiscal Year End Date Current Fiscal Year End Date Debt Instrument [Table] Schedule of Long-Term Debt Instruments [Table] Document Quarterly Report Document Quarterly Report Other Cost and Expense, Operating, Total Miscellaneous expenses, net Other Cost and Expense, Operating Entity Address, State or Province Entity Address, State or Province Line of Credit Facility, Remaining Borrowing Capacity Debt instrument, borrowing availability under Credit Agreement Incremental Common Shares Attributable to Share-based Payment Arrangements, Total Dilutive effect of share-based awards Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Claims and insurance accruals Carrying Amount of Accrued Known and Estimated Losses Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted that are expected to be paid within one year (or the normal operating cycle, if longer). 2020 Share Repurchase Program [Member] 2020 Share Repurchase Program [Member] A2020 Stock Repurchase Program [Member] 2020 stock repurchase program member. Description of revenue from external customers Disclosure on Geographic Areas, Description of Revenue from External Customers Long-term debt, fair value Long-Term Debt, Fair Value Subsequent Event [Member] Other Assets, Noncurrent, Total Other assets Other Assets, Noncurrent Total repurchased shares Stock Dividends, Shares Stock Dividends, Shares, Total Series B Notes [Member] Series B Notes [Member] Series B notes. Basis of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] 2024 ASR Agreement [Member] 2024 ASR agreement. Depreciation and amortization Depreciation And Amortization Including Debt Issuance Costs Depreciation and amortization including debt issuance costs. Cash and Cash Equivalents Cash and Cash Equivalents [Domain] Unsecured Senior Notes [Member] Unsecured Debt [Member] Salary and Wages Amount of expense for salary, wage, and incentive and equity-based compensation. Salaries and wages Maturity date Debt Instrument, Maturity Date Minimum [Member] Minimum [Member] Other Service Revenue [Member] Other Service Revenue [Member] Other Service Revenue [Member] Current assets: Assets, Current [Abstract] A2023 Share Repurchase Program [Member] A2023 Share Repurchase Program. 2023 Share Repurchase Program [Member] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Segment Reporting [Abstract] Schedule of Fair Value of Short-term Investments Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Current liabilities: Liabilities, Current [Abstract] Share repurchases, including settlements under accelerated share repurchase programs Stock repurchased and retired during period, value Share repurchases, including transaction costs Share repurchases, including transaction costs Accounts Receivable, after Allowance for Credit Loss, Current, Total Accounts Receivable, after Allowance for Credit Loss, Current Customer receivables, less allowances of $9,007 and $7,924, respectively Commitments and contingent liabilities Commitments and Contingencies Eurodollar [Member] Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Share-based compensation and share issuances, net of forfeitures, shares Interest Rate Spread added to Rate Debt Instrument, Basis Spread on Variable Rate Forecast [Member] Forecast [Member] Amended Revolving Credit Facility [Member] Amended revolving credit facility. 2019 Credit Agreement [Member] Long-term liabilities: Liabilities, Noncurrent [Abstract] Net income Net income Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Accrued Income Taxes, Current Income taxes payable Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Other, net Long-term Debt, Type Long-Term Debt, Type [Domain] Weighted Average Number of Shares Outstanding, Basic, Total Weighted average shares outstanding - basic Basic Weighted Average Number of Shares Outstanding, Basic Scenario Scenario [Axis] Series B [Member] Series B [Member] Variable Rate [Domain] Balance Balance Total shareholders’ equity Equity, Attributable to Parent Significant Accounting Policies [Table] Significant Accounting Policies [Table] Significant Accounting Policies [Table] Statement of Stockholders' Equity [Abstract] Debt, Long-Term and Short-Term, Combined Amount Total long-term debt Total long-term debt Insurance and claims Operating Insurance and Claims Costs, Production Fair Value Measurements Fair Value Disclosures [Text Block] Debt Instrument, Name Debt Instrument, Name [Domain] Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Credit Facility Credit Facility [Axis] Certificates of deposit [Member] Certificates of Deposit [Member] Taxes paid in exchange for shares withheld, shares Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Related Party Related and Nonrelated Parties [Axis] Entity Address, City or Town Entity Address, City or Town 2019 Share Repurchase Program [Member] A2019 Stock Repurchase Program [Member] 2019 Stock Repurchase Program [Member] Number of Reportable Segments Number of reportable segments Security Exchange Name Security Exchange Name Credit Facility Credit Facility [Domain] Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross, Beginning Balance Total property and equipment Property, Plant and Equipment, Gross Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Statistical Measurement Statistical Measurement [Domain] Total current assets Assets, Current Document Period End Date Document Period End Date Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Gain (Loss) on Disposition of Property Plant Equipment, Total Gain (Loss) on Disposition of Property Plant Equipment (Gain) loss on disposal of property and equipment Long-Term Debt Long-Term Debt [Text Block] Statement of Financial Position [Abstract] Common Stock Split Common Stock Split [Policy Text Block] Common stock split. ASR Agreement [Member] Accelerated Share Repurchase Agreement [Member] Accelerated share repurchase agreement. Land and structures Buildings Land And Improvements Gross Carrying amount as of the balance sheet date of buildings, land and improvements. Total liabilities Liabilities Variable Rate [Axis] Weighted average shares outstanding - diluted Diluted Weighted Average Number of Shares Outstanding, Diluted Entity File Number Securities Act File Number Cover [Abstract] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Percentage of initial delivery received Percentage of initial delivery received. Operating taxes and licenses Cost, Direct Tax and License Scenario Scenario [Domain] Number of operating segment Number of Operating Segments Segment Information Segment Reporting Disclosure [Text Block] Machinery and Equipment, Gross, Total Revenue equipment Machinery and Equipment, Gross Total revenue from operations Revenue from operations Revenue from Contract with Customer, Including Assessed Tax Note Agreement [Member] Note Agreement [Member] 2020 Note agreement. Purchased transportation Purchased Transportation Costs associated with the use of third parties transportation companies to fulfill part or all of a service to our customers under our customer agreements. New Accounting Pronouncements, Policy [Policy Text Block] Recently Adopted Accounting Pronouncements/Recently Issued Accounting Pronouncements Not Yet Adopted Proceeds from Issuance of Long-term Debt, Total Proceeds from issuance of senior promissory notes Proceeds from issuance of long-term debt Proceeds from Issuance of Long-Term Debt Other Receivables, Net, Current, Total Other receivables Other Receivables, Net, Current Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock, shares outstanding Common Stock, Shares, Outstanding Document Transition Report Document Transition Report Payments for share repurchases Payments for repurchase of common stock recieved under stock repurchase ASR agreement Payments for Repurchase of Common Stock Statement of Cash Flows [Abstract] Two Thousand Twenty Three Credit Agreement. Two Thousand Twenty Three Credit Agreement [Member] 2023 Credit Agreement [Member] Earnings Per Share Earnings Per Share [Text Block] Balance, in shares Balance, in shares Shares, Issued Net income Net Income (Loss) Attributable to Parent, Total Other financing activities, net Proceeds from (Payment for) Other Financing Activity ASSETS Assets [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total Share-based compensation and share issuances, net of forfeitures Fair Value Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Long-term Line of Credit, Total Revolving credit facility Long-Term Line of Credit Credit agreement borrowings Debt Instrument Debt Instrument [Axis] Assets, Fair value Assets, Fair Value Disclosure Assets, Fair Value Disclosure, Total Other fixed assets Property, Plant and Equipment, Other, Gross Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Title of 12(b) Security Title of 12(b) Security Schedule of Segment Reporting Information, by Segment [Table] Investment Income, Net, Total Interest income Investment Income, Net Share Repurchase Program, Remaining Authorized, Amount Stock repurchase program, remaining authorized repurchase amount Related Party Related and Nonrelated Parties [Domain] 2021 Share Repurchase Program [Member] A2021 Share Repurchase Program [Member] 2021 stock repurchase program. Other Liabilities, Noncurrent, Total Other non-current liabilities Other Liabilities, Noncurrent Debt Instrument, Redemption, Period [Domain] P G I M I N C [Member] P G I M I N C [Member] Prudential. Letters of Credit Outstanding, Amount Letters of Credit Outstanding, Amount Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Capital In Excess Of Par Value [Member] Additional Paid-in Capital [Member] Stock repurchase program, authorized amount Stock repurchase program, authorized amount Share Repurchase Program, Authorized, Amount Trading Symbol Trading Symbol Subsequent Event Type [Axis] Employee-related Liabilities, Current Employee-related Liabilities, Current, Total Compensation and benefits Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Interest and Debt Expense, Total Interest expense Interest and Debt Expense Equity Components Equity Components [Axis] Nonoperating Income (Expense) Total non-operating income Total non-operating income Total non-operating income Equity Component Equity Component [Domain] Leasehold improvements Leasehold Improvements, Gross Fixed interest rate Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate Changes in operating assets and liabilities, net. Changes in operating assets and liabilities, net Changes in operating assets and liabilities, net Depreciation, Depletion and Amortization, Nonproduction, Total Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Maximum [Member] Maximum [Member] Statistical Measurement Statistical Measurement [Axis] Available and Uncommitted [Member] Available and Uncommitted. Reconciliation of Number of Common Stock used in Computing Basic and Diluted Earning Per Share Schedule of Weighted Average Number of Shares [Table Text Block] Costs and Expenses Total operating expenses Accelerated share repurchase agreement, Amount paid Agreement Amount Accelerated Share Repurchases, Settlement (Payment) or Receipt Entity Registrant Name Entity Registrant Name Scheduled principal payment Debt Instrument, Periodic Payment, Principal Initial delivery received, shares Initial shares delivered Treasury Stock, Shares, Acquired Other Nonoperating Income (Expense), Total Other expense, net Other Nonoperating Income (Expense) Number of additional share of common stock received Conversion of Stock, Shares Issued Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) [Member] Total provision for income taxes Provision for income taxes Income Tax Expense (Benefit) Payments to Acquire Productive Assets, Total Purchase of property and equipment Payments to Acquire Productive Assets Operating expenses: Costs and Expenses [Abstract] Less significant expenses: Credit Agreement [Member] Credit agreement member. Credit Agreement [Member] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Amount remaining of a stock repurchase plan authorized and deferred. Stock Repurchase Program Remaining Authorized Deferred Repurchase Amount Stock repurchase program remaining authorized deferred repurchase amount Consolidation Items [Axis] LTL Service Revenue [Member] L T L Service Revenue [Member] LTL Service Revenue [Member] Total assets Assets Income Statement [Abstract] Earnings Per Share, Diluted, Total Diluted Earnings Per Share, Diluted Schedule of Financial Information with Respect to our Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Operating Segments [Member] Dividends, Common Stock, Total Dividends, Common Stock Cash dividend declared Disaggregation of Revenue [Abstract] City Area Code City Area Code Line of Credit Facility, Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Schedule of Revenue by Major Customers, by Reporting Segments [Table] Disaggregated Revenue Disaggregated Revenue Table [Text Block] Tabular disclosure of an entity's revenue disaggregated by service. Segment Reporting Information [Line Items] Common stock, conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Original borrowing capacity Line Of Credit Facility Original Borrowing Capacity Amount of original borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. Letter of Credit [Member] Letter of Credit [Member] Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Net property and equipment Property, Plant and Equipment, Net Operating income Operating Income (Loss) Retained Earnings [Member] Retained Earnings [Member] Cash and Cash Equivalents Cash and Cash Equivalents [Axis] Total long-term liabilities Liabilities, Noncurrent Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Deferred Income Tax Liabilities, Net, Total Deferred income taxes Deferred Income Tax Liabilities, Net Nonoperating Income (Expense) [Abstract] Non-operating expense (income): Entity Interactive Data Current Entity Interactive Data Current Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Common Stock, Dividends, Per Share, Declared Cash dividends declared per share Dividend declared per share Entity Tax Identification Number Entity Tax Identification Number Long-term Debt, Type Long-Term Debt, Type [Axis] Local Phone Number Local Phone Number Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Accounting Policies [Abstract] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Commercial paper [Member] Commercial Paper [Member] Salaries, wages and benefits Labor and Related Expense Entity Emerging Growth Company Entity Emerging Growth Company President and CEO. President And C E O [Member]