Due in 5-10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Deferred income taxes Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Supplemental Cash Flow Information [Abstract] Supplemental Cash Flow Information [Abstract] Type of Brand [Domain] Type of Brand [Domain] Type of Brand [Domain] 2019 Bank of America Revolving Credit Facility New Vehicles 2019 Bank of America Revolving Credit Facility, New Vehicles [Member] 2019 Bank of America Revolving Credit Facility, New Vehicles Goodwill Disposal Group, Including Discontinued Operation, Goodwill New and used vehicle New and used vehicle [Member] New and used vehicle [Member] Earnings per Share Earnings Per Share, Policy [Policy Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] NET INCOME Net income Net Income (Loss) Attributable to Parent Components of Inventory [Axis] Components of Inventory [Axis] Components of Inventory OPERATING LEASE RIGHT-OF-USE ASSETS Operating Lease, Right-of-Use Asset Schedule of Business Acquisitions Schedule of Business Acquisitions, by Acquisition [Table Text Block] Finance and insurance, net Finance and Insurance, net Finance and insurance [Member] Finance and insurance [Member] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Floor plan borrowings—non-trade Proceeds From Floor Plan Borrowings Non Trade Borrowings of floorplan notes payable to parties other than the manufacturer of the new vehicle and all floorplan notes payable related to pre-owned vehicles. Income Statement Location [Axis] Income Statement Location [Axis] Receivable Type [Axis] Receivable Type [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Reduction to cost of sales Reduction to New Vehicle Cost of Sales by Automobile Manufacturer Incentives Reduction to New Vehicle Cost of Sales by Automobile Manufacturer Incentives Floor plan repayments—divestitures Repayments Of Floor Plan Payables Non Trade Divestitures Repayment of floor plan payables non trade associated with the sale of the related franchise. Loaner vehicle amortization Cost, Depreciation and Amortization Deferred revenue Increase (Decrease) in Contract with Customer, Asset Segment Reporting Segment Reporting, Policy [Policy Text Block] Security Exchange Name Security Exchange Name New vehicle New Vehicle Cost of Sales Cost associated with new vehicle sale and lease transcations with individual retail and commercial customers. Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code 2021 BofA Real Estate Facility 2021 BofA Real Estate Facility [Member] 2021 BofA Real Estate Facility Operating lease liabilities Disposal Group, Including Discontinued Operation, Operating Lease Liabilities Disposal Group, Including Discontinued Operation, Operating Lease Liabilities Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Schedule of Contract with Customer, Assets Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Share Repurchases Share Repurchase Policy [Policy Text Block] Share Repurchase Policy [Policy Text Block] Additional paid-in capital Additional Paid in Capital, Common Stock Loaner vehicle period of use before sale (in months) Loaner Vehicle Period of Use Before Sale Loaner Vehicle Period of Use Before Sale 5.00% Senior Notes due 2032 Five Point Zero Zero Percent Percent Senior Notes due 2029 [Member] Five Point Zero Zero Percent Percent Senior Notes due 2029 OTHER LONG-TERM ASSETS Other Assets, Noncurrent Segments [Axis] Segments [Axis] Net (decrease) increase in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Entity File Number Entity File Number Contracts-In-Transit Contracts In Transit [Policy Text Block] Contracts-in-transit policy represents receivables from third-party finance companies for the portion of new and used vehicle purchase price financed by customers through sources arranged by us. Share-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Schedule of Debt Securities, Available-for-Sale Debt Securities, Available-for-sale [Table Text Block] Current maturities of long-term debt Disposal Group, Including Discontinued Operation, Current Maturities of Long-term Debt Disposal Group, Including Discontinued Operation, Current Maturities of Long-term Debt Components of Inventory [Domain] Component of Inventory [Domain] Component of Inventory [Domain] Other receivables Other Trade Accounts Receivable [Member] Other Trade Accounts Receivable [Member] Finance and insurance Finance and Insurance Expense Finance and Insurance Expense Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Intangible franchise rights Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Floor plan interest expense Floor Plan interest Expense Interest expense incurred on vehicle floorplan payable trade and non-trade outstanding during the period. LONG-TERM DEBT Long-term debt Long-term Debt and Lease Obligation Schedule of Inventory Schedule of Inventory, Current [Table Text Block] Antidilutive securities excluded from computation of earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Finance and insurance, net Finance and insurance, net [Member] Finance and insurance, net ACQUISITIONS AND DIVESTITURES Business Combination and Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Business Combination and Disposal Groups, Including Discontinued Operations, Disclosure Deferred income taxes Deferred Income Tax Expense (Benefit), Continuing Operations and Discontinued Operations Deferred Income Tax Expense (Benefit), Continuing Operations and Discontinued Operations New Vehicle Floor Plan Facility New Vehicle Floor Plan Facility [Member] New Vehicle Floor Plan Facility [Member] Number of states (in states) Number of States in which Entity Operates Restricted Cash and Securities Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Business Acquisition [Axis] Business Acquisition [Axis] 2018 Wells Fargo Master Loan Facility 2018 Wells Fargo Master Loan Facility [Member] 2018 Wells Fargo Master Loan Facility [Member] SOFR Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Municipal Municipal Bonds [Member] INVESTMENTS Investments Noncurrent Investments Noncurrent Sale of vehicle parts and accessories Sale of vehicle parts and accessories [Member] Sale of vehicle parts and accessories [Member] Change in fair value of cash flow swaps, net of reclassification adjustment and $6.9 tax charge OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Schedule of Carrying Values and Fair Values of Liabilities Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] Disposal Group Name [Axis] Disposal Group Name [Axis] Gains (losses) on changes in fair value of debt securities, tax benefit OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Deferred Commissions Deferred Commissions [Member] Deferred Commissions Award Type [Domain] Award Type [Domain] Local Phone Number Local Phone Number Credit Facility [Domain] Credit Facility [Domain] ASSETS Assets [Abstract] Total by maturity Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value Schedule of Carrying Amounts of Investment Securities and Fair Values Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Operating lease liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Operating lease liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Operating lease liabilities Liabilities Other Liabilities [Member] Floor plan notes payable—trade Floor Plan Notes Payable Trade, Gross Floor Plan Notes Payable Trade, Gross Schedule of Amortized Cost and Fair Value of TCA's Investment Investments Classified by Contractual Maturity Date [Table Text Block] Preferred stock, $.01 par value; 10,000,000 shares authorized; none issued or outstanding Preferred Stock, Value, Issued Purchases of previously leased real estate Payments to Acquire Previously Leased Real Estate Payments to Acquire Previously Leased Real Estate Retained Earnings Retained Earnings [Member] Debt Instrument [Axis] Debt Instrument [Axis] Domestic Brands Domestic Brands [Member] Domestic Brands [Member] Used vehicle Used Vehicle Cost of Sales Cost associated with used vehicle revenues, including the sale of used vehicles to individual retail customers and the wholesaling of used vehicles primarily to auctions or other dealers. COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] FINANCIAL INSTRUMENTS AND FAIR VALUE Derivatives and Fair Value [Text Block] Amount of surety bond line maintained Amount of Surety Bond Line Maintained Amount of Surety Bond Line maintained in the ordinary course of business. Total debt securities Debt Securities [Member] Retirement of common stock Retirement of common stock Stock Repurchased and Retired During Period, Value Accounts receivable Increase (Decrease) in Accounts Receivable Interest Rate Swap, January 2022 Interest Rate Swap, January 2022 [Member] Interest Rate Swap, January 2022 Inventories, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Other long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Repurchase of common stock associated with net share settlements of employee share-based awards (in shares) Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Property and equipment, net Disposal Group, Including Discontinued Operation, Property, Plant and Equipment Interest rate swap, net loss amount expected to be reclassified in the next twelve months Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Number of dealership locations, sold (in dealership locations) Number Of Dealership Locations, Sold Number Of Dealership Locations, Sold Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue Number of stand-alone used vehicle stores Number of stand-alone used vehicle stores Number of stand-alone used vehicle stores Net income (in dollars per share) Earnings Per Share, Basic (Gain) loss on dealership divestitures, net Gain on divestitures Gain (Loss) on Disposition of Business Amount Reclassified from Accumulated Other Comprehensive Income/(Loss) to Earnings Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Used vehicle Used Vehicle Revenue Used vehicle revenues include the sale of used vehicles to individual retail customers and the wholesaling of used vehicles primarily to auctions or other dealers. REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] Bank of America, N.A. Bank of America, N.A. [Member] Bank of America, N.A. [Member] Used vehicle retail Used vehicle retail [Member] Used vehicle retail [Member] Purchases of equity securities Payments to Acquire Equity Securities, FV-NI Due in 1-5 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] ASSETS HELD FOR SALE Disclosure of Long Lived Assets Held-for-sale During Period [Text Block] Disclosure of Long Lived Assets Held-for-sale During Period [Text Block] Diluted— Earnings Per Share, Diluted [Abstract] TCA Insurance [Member] Insurance Number of franchises, sold (in franchises) Number of Franchises, Sold Number of Franchises, Sold Repurchase of common stock associated with net share settlements of employee share-based awards Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Other adjustments, net Other Noncash Income (Expense) Restricted cash and cash equivalents Restricted Cash and Cash Equivalents Schedule of Preliminary Purchase Consideration Schedule of Preliminary Purchase Consideration [Table Text Block] Schedule of Preliminary Purchase Consideration Floor plan notes payable—used non-trade Floor Plan Notes Payable Non Trade, Used, Gross Floor Plan Notes Payable Non Trade, Used, Gross Operating lease right-of-use assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Right-of-Use Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Right-of-Use Assets Accounts receivable, net Accounts receivable, net Receivables, Net, Current Aggregate purchase price Business Combination, Consideration Transferred Federal Funds Rate Base Rate Component, Federal Funds [Member] Federal Funds [Member] Long-term debt, gross Long-term Debt, Gross Current maturities of long-term debt Less—current portion, net of current portion of debt issuance costs Long-term Debt and Lease Obligation, Current 4.625% Senior Notes due 2029 Four Point Six Two Five Percent Senior Notes due 2029 [Member] Four Point Six Two Five Percent Senior Notes due 2029 Reduction of new vehicle inventory cost by automobile manufacturer incentives Inventory Adjustments Total carrying value Long-term Debt Guarantee Obligations Guarantee Obligations [Member] Level 1 Fair Value, Inputs, Level 1 [Member] CASH FLOW FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Preliminary purchase price, net of cash acquired Preliminary Payments to Acquire Businesses, Net of Cash Acquired Preliminary Payments to Acquire Businesses, Net of Cash Acquired Entity Small Business Entity Small Business Performance share units (in shares) Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Interest Rate Swap, June 2015 Interest Rate Swap3 [Member] Interest Rate Swap3 Base Rate Base Rate [Member] Total liabilities and shareholders' equity Liabilities and Equity Investments, Debt and Equity Securities [Abstract] Change in fair value of cash flow swaps, net of reclassification adjustment Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Deferred revenue—current Contract with Customer, Liability, Current Results Recognized in Accumulated Other Comprehensive Income/(Loss) OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax Amount Reclassified from Accumulated Other Comprehensive Income/(Loss) to Earnings Debt Securities, Available-for-Sale, Loss Reclassified from Accumulated OCI into Income, Effective Portion Debt Securities, Available-for-Sale, Loss Reclassified from Accumulated OCI into Income, Effective Portion Vacant property Vacant Property [Member] Vacant Property [Member] Floor plan notes payable offset account Floor Plan Notes Payable Trade, Offsets Floor Plan Notes Payable Trade, Offsets LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Derivatives and Fair Value [Abstract] Derivatives and Fair Value [Abstract] Derivative [Line Items] Derivative [Line Items] Interest Rate Swap Interest Rate Swap, January 2022 Interest Rate Swap [Member] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Intangible franchise rights Disposal Group, Including Discontinued Operation, Intangible Assets Loaner vehicles Disposal Group, Including Discontinued Operation, Loaners Disposal Group, Including Discontinued Operation, Loaners Long-term debt Disposal Group, Including Discontinued Operation, Long-term Debt Disposal Group, Including Discontinued Operation, Long-term Debt Total assets held for sale Disposal Group, Including Discontinued Operation, Assets Share repurchases Treasury Stock, Value, Acquired, Cost Method OPERATING EXPENSES: Operating Expenses [Abstract] Schedule of Derivative Instruments Effect on Accumulated Other Comprehensive Income Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Floor plan notes payable—non-trade Floor Plan Notes Payable Non Trade, New, Gross Floor Plan Notes Payable Non Trade, New, Gross Entity Interactive Data Current Entity Interactive Data Current Fair value of interest rate swaps Interest Rate Cash Flow Hedge Derivative at Fair Value, Net LHM Dealerships LHM Dealerships [Member] LHM Dealerships Minimum Minimum [Member] Debt securities, available-for-sale, realized gain Debt Securities, Available-for-sale, Realized Gain Other long-term assets and liabilities, net Increase (Decrease) in Other Operating Assets and Liabilities, Net GROSS PROFIT Gross profit Gross Profit Schedule of Fair Value, Assets Measured on Recurring and Nonrecurring Basis Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Selling, general, and administrative Selling, General and Administrative Expense Less—debt issuance costs Debt Issuance Costs, Net Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Proceeds from the sale of assets Proceeds from Sale of Productive Assets Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Entity Address, State or Province Entity Address, State or Province Due after 10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Components of Inventory [Line Items] Components of Inventory [Line Items] Components of Inventory [Line Items] 12 Months or Longer, Fair Value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Debt instrument, conversion, maximum convertible amount, amount subtracted from contractual total Debt Instrument, Conversion, Maximum Convertible Amount, Amount Subtracted from Contractual Total Debt Instrument, Conversion, Maximum Convertible Amount, Amount Subtracted from Contractual Total Operating lease right-of-use assets Disposal Group, Including Discontinued Operation, Operating Lease ROU Assets Disposal Group, Including Discontinued Operation, Operating Lease ROU Assets CURRENT LIABILITIES: Liabilities, Current [Abstract] Amount available under revolving loan credit facility transferred to new vehicle floor plan facility Amount Available under Revolving Loan Credit Facility Transferred to New Vehicle Floor Plan Facility Amount Available under Revolving Loan Credit Facility Transferred to New Vehicle Floor Plan Facility Receivable [Domain] Receivable [Domain] SUPPLEMENTAL CASH FLOW INFORMATION Cash Flow, Supplemental Disclosures [Text Block] 4.75% Senior Notes due 2030 Four Point Seven Five Percent Senior Notes due 2030 [Member] Four Point Seven Five Percent Senior Notes due 2030 [Member] Acquisitions Payments to Acquire Businesses, Net of Cash Acquired Senior Notes Senior Notes [Member] Level 3 Fair Value, Inputs, Level 3 [Member] INVENTORIES Inventory Disclosure [Text Block] Wells Fargo Bank, National Association Wells Fargo Bank, National Association [Member] Wells Fargo Bank, National Association [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Other Business Combination, Consideration Transferred, Other Number of reportable segments Number of Reportable Segments COST OF SALES: Cost of Revenue [Abstract] Other long-term assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Amount of letters of credit outstanding Letters of Credit Outstanding, Amount Document Transition Report Document Transition Report Common stock, $.01 par value; 90,000,000 shares authorized; 44,100,010 and 45,052,293 shares issued, including shares held in treasury, respectively Common Stock, Value, Issued Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total other expenses, net Nonoperating Income (Expense) Total liabilities associated with assets held for sale Disposal Group, Including Discontinued Operation, Liabilities Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Performance Share Units Performance Shares [Member] COMMITMENTS AND CONTINGENCIES (Note 13) Commitments and Contingencies Accumulated other comprehensive gain (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Emerging Growth Company Entity Emerging Growth Company Less—Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current 2018 Bank of America Facility 2018 BofA Real Estate Facility [Member] 2018 BofA Real Estate Facility [Member] SOFR plus basis spread SOFR Plus Basis Spread [Member] SOFR Plus Basis Spread Payment of debt issuance costs Payments of Debt Issuance Costs Receivables [Abstract] Receivables [Abstract] Change in fair value of cash flow swaps, tax Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax Disposal Group Classification [Axis] Disposal Group Classification [Axis] Colorado COLORADO INVESTMENTS Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Legal Entity [Axis] Legal Entity [Axis] Cover [Abstract] Cover [Abstract] 2019 Bank of America Revolving Credit Facility Used Vehicles 2019 Bank of America Revolving Credit Facility UsedVehicles [Member] 2019 Bank of America Revolving Credit Facility UsedVehicles Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Treasury stock, shares (in shares) Treasury Stock, Shares Schedule of Unrealized Loss on Investments Schedule of Unrealized Loss on Investments [Table Text Block] Holdback release Business Combination, Consideration Transferred, Other, Release Business Combination, Consideration Transferred, Other, Release Amortization of costs to obtain a contract with a customer Contract with Customer, Asset, Amortization of costs to obtain a contract with a customer Contract with Customer, Asset, Amortization of costs to obtain a contract with a customer 2021 Real Estate Facility 2021 Real Estate Facility [Member] 2021 Real Estate Facility 2013 BofA Real Estate Facility 2015 Wells Fargo Master Loan Facility [Member] 2015 Wells Fargo Master Loan Facility [Member] Purchases of treasury stock Purchases of Treasury Stock Purchases of Treasury Stock Financial Instrument [Axis] Financial Instrument [Axis] Entity [Domain] Entity [Domain] Total revenue Revenue from Contract with Customer, Excluding Assessed Tax Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] ACCOUNTS RECEIVABLE Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Consolidation Items [Domain] Consolidation Items [Domain] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Floor plan notes payable, offsets Floor Plan Notes Payable, Offsets Floor Plan Notes Payable, Offsets Document Quarterly Report Document Quarterly Report Luxury Brands Luxury Brands [Member] Luxury Brands [Member] Less than 12 Months, Fair Value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Common Stock Common Stock [Member] Variable Rate [Axis] Variable Rate [Axis] Inventory Disposal Group, Including Discontinued Operation, Inventory SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] INCOME FROM OPERATIONS Operating Income (Loss) Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] Current maturities of operating leases Operating Lease, Liability, Current Due in 1-5 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Gross Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Weighted brand mix (percent) Brand Mix Brand Mix DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Finance and insurance, net FinanceandinsuranceNet Revenues derived from the arrangement of vehicle financing and the sale of aftermarket products, such as insurance and service contracts. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Document Fiscal Year Focus Document Fiscal Year Focus Net assets held for sale Assets held-for-sale Assets Held-for-sale, Not Part of Disposal Group Share-based compensation Share-based Payment Arrangement, Noncash Expense Variable Rate [Domain] Variable Rate [Domain] Cash equivalents Cash and Cash Equivalents, at Carrying Value Additional Paid-in Capital Additional Paid-in Capital [Member] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Treasury Stock Treasury Stock [Member] Number of collision repair centers (in collision repair centers) Number of Collision Repair Centers Number of Collision Repair Centers Purchases of debt securities—available-for-sale Payments to Acquire Debt Securities, Available-for-sale Proceeds from revolving credit facility Proceeds from Lines of Credit Notional amount Derivative, Notional Amount Total fair value Long-term Debt, Fair Value Notional principal amount at maturity Notional Principal at Maturity Derivative Liability, Notional Amount, at Maturity Derivative Liability, Notional Amount, at Maturity Retirement of common stock (in shares) Retirement of common stock (in shares) Stock Repurchased and Retired During Period, Shares Business Combinations [Abstract] Business Combinations [Abstract] Maximum Maximum [Member] INTANGIBLE FRANCHISE RIGHTS Indefinite-Lived Franchise Rights Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Operating lease liabilities Operating Lease Liability, Operating Activities Operating Lease Liability, Operating Activities Increases related to revenue recognized, inclusive of adjustments to constraint, during the period Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress Award Type [Axis] Award Type [Axis] New vehicles New Vehicles [Member] New Vehicles CASH FLOW FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Consolidation Items [Axis] Consolidation Items [Axis] Total shareholders' equity Stockholders' Equity Attributable to Parent Common stock, shares issued (in shares) Common Stock, Shares, Issued Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued City Area Code City Area Code Accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Dealerships Dealerships [Member] Dealerships Schedule of Components of Inventory [Table] Schedule of Components of Inventory [Table] Schedule of Components of Inventory [Table] Allowance for credit losses Accounts and Financing Receivable, Allowance for Credit Loss Floor plan repayments—non-trade Repayments Of Floor Plan Payables Non Trade Repayments of floorplan notes payable to parties other than the manufacturer of the new vehicle and all floorplan notes payable related to pre-owned vehicles. Entity Address, City or Town Entity Address, City or Town Costs incurred to obtain a contract with a customer Contract with Customer, Costs to Obtain Contract Contract with Customer, Costs to Obtain Contract Debt securities, available-for-sale, realized loss Debt Securities, Available-for-sale, Realized Loss Repurchases of common stock, including amounts associated with net share settlements of employee share-based awards Payments for Repurchase of Common Stock Manufacturer receivables Manufacturer Receivables [Member] Manufacturer Receivables [Member] SHAREHOLDERS' EQUITY: Stockholders' Equity Attributable to Parent [Abstract] New vehicle New Vehicle Revenue New vehicle revenues include new vehicle sale and lease transactions with individual retail customers and commercial customers. Real estate held-for-sale Real Estate Held-for-sale Balance Sheet Location [Axis] Balance Sheet Location [Axis] OPERATING LEASE LIABILITIES Operating Lease, Liability, Noncurrent Measurement Frequency [Domain] Measurement Frequency [Domain] Cash paid during the period related to floor plan interest Cash paid during the period related to floor plan interest Cash paid during the period related to floor plan interest Parts and accessories Parts and accessories [Member] Parts and Accessories Discontinued Operations and Disposal Groups [Abstract] Discontinued Operations and Disposal Groups [Abstract] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Net assets acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Retained earnings Retained Earnings (Accumulated Deficit) Restricted Share Units Restricted Stock Units (RSUs) [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category Finance lease liability Finance Lease, Liability Business Acquisition [Line Items] Business Acquisition [Line Items] New vehicle New vehicle [Member] New vehicle [Member] Assets: Disposal Group, Including Discontinued Operation, Assets [Abstract] Income tax (charge) benefit associated with cash flow swaps Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent U.S. Treasury US Treasury Securities [Member] Statement of Income: Income Statement [Abstract] Interest Rate Swap, July 20 Interest Rate Swap 1.1 [Member] Interest Rate Swap 1.1 [Member] Entity Registrant Name Entity Registrant Name Number of instruments held Derivative, Number of Instruments Held Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Accounts receivable, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables Repayments of revolving credit facility Repayments of Lines of Credit Liabilities: Disposal Group, Including Discontinued Operation, Liabilities [Abstract] OTHER EXPENSES: Other Expenses [Abstract] Other long-term assets Other Noncurrent Assets [Member] Short-term investments Short-term Investments Parts and service Parts and services [Member] Parts and services [Member] Balance Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Income tax expense Income Tax Expense (Benefit) Amendment Flag Amendment Flag Proceeds from borrowings Proceeds from Issuance of Long-term Debt Equity Components [Axis] Equity Components [Axis] Missouri MISSOURI Entity Tax Identification Number Entity Tax Identification Number Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Investment Type [Axis] Investment Type [Axis] Document Fiscal Period Focus Document Fiscal Period Focus Total current assets Assets, Current Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Total debt outstanding Long Term Debt and Lease Obligations, Current and Noncurrent Long Term Debt and Lease Obligations, Current and Noncurrent Inventories Total inventories Inventory, Net Schedule of Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Type of Brand [Axis] Type of Brand [Axis] Type of Brand [Axis] 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] Available-for-Sale, Fair Value Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] Balance Sheet: Statement of Financial Position [Abstract] Number of used cars stores acquired (in stores) Number of Used Cars Stores Acquired Number of Used Cars Stores Acquired Product and Service [Axis] Product and Service [Axis] Floor plan notes payable—trade, net Increase (Decrease) In Floor Plan Notes Payable Trade The net change during the reporting periods of floor plan notes payable with the manufacturer of new vehicles. Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Equity Component [Domain] Equity Component [Domain] Floor plan notes payable—non-trade, liabilities associated with assets held for sale Floor Plan Notes Payable—Non-Trade, Liabilities Associated with Assets Held for Sale Floor Plan Notes Payable—Non-Trade, Liabilities Associated with Assets Held for Sale Issuance of common stock, net of forfeitures in connection with share-based payment arrangements (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Disposal Group Name [Domain] Disposal Group Name [Domain] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Current maturities of operating leases Disposal Group, Including Discontinued Operation, Operating Leases, Current Maturities Disposal Group, Including Discontinued Operation, Operating Leases, Current Maturities Investments [Abstract] Used Vehicle Floor Plan Facility Used Vehicle Floor Plan Facility [Member] Used Vehicle Floor Plan Facility [Member] Long Lived Assets Held-for-sale [Line Items] Long Lived Assets Held-for-sale [Line Items] Number of new vehicle dealerships acquired (in dealerships) Number of New Vehicle Dealerships Acquired Number of New Vehicle Dealerships Acquired Common stock offering Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Amortization of debt securities discount/premium Amortization of Debt Discount (Premium) Statement [Line Items] Statement [Line Items] Business Combinations and Discontinued Operations and Disposal Groups [Abstract] Business Combinations and Discontinued Operations and Disposal Groups Change in fair value of cash flow swaps Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Contracts-in-transit Increase (Decrease) in Contract with Customer, Liability Total current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets Statements of Cash Flows Statement of Cash Flows, Policy [Policy Text Block] Statement of Cash Flows, Policy [Policy Text Block] Issuance of common stock, net of forfeitures, in connection with share-based payment arrangements Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Fair Value Debt Securities, Available-for-sale Short-term investments Short-term Investments [Member] Debt Disclosure [Abstract] Debt Disclosure [Abstract] INCOME BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Level 2 Fair Value, Inputs, Level 2 [Member] Assets Held for Sale and Liabilities Associated with Assets Held for Sale Assets Held for Sale and Liabilities Associated with Assets Held for Sale Policy [Policy Text Block] Assets Held for Sale and Liabilities Associated with Assets Held for Sale Policy [Policy Text Block] Loaner vehicles payable Disposal Group, Including Discontinued Operation, Loaners, Liabilities Disposal Group, Including Discontinued Operation, Loaners, Liabilities DEFERRED REVENUE Contract with Customer, Liability, Noncurrent Liabilities associated with assets held for sale Disposal Group, Including Discontinued Operation, Liabilities, Current Restricted stock (in shares) Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights Total Fair Value Debt Securities, Available-for-sale, Unrealized Loss Position Segment Reporting [Abstract] Interest Rate Swap, July 20 Interest Rate Swap2 [Member] Interest Rate Swap2 Amortized Cost Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Use of Estimates Use of Estimates, Policy [Policy Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Floor plan notes payable—non-trade Disposal Group, Including Discontinued Operation, Floor Plan Notes Payable—Non-Trade Disposal Group, Including Discontinued Operation, Floor Plan Notes Payable—Non-Trade Other interest expense, net Floor Plan Interest Expense and Other Interest Expense [Member] Floor Plan Interest Expense and Other Interest Expense [Member] Disposed of by sale Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] Number of dealership locations (in dealership locations) Number Of Dealership Locations Number Of Dealership Locations Title of 12(b) Security Title of 12(b) Security Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Total assets Assets Assets Liabilities associated with assets held for sale Mortgage Notes Payable, Liabilities Associated with Assets Held for Sale Mortgage Notes Payable, Liabilities Associated with Assets Held for Sale Common stock, shares authorized (in shares) Common Stock, Shares Authorized Interest payments made including amounts capitalized Interest Paid, Excluding Capitalized Interest, Operating Activities Geographical [Domain] Geographical [Domain] Income tax benefit associated with available-for-sale debt securities Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent Repayments of borrowings Repayments of Secured Debt Total by maturity Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost Document Type Document Type Base rate component, SOFR Base Rate Component, SOFR [Member] Base Rate Component, SOFR Equity securities, available-for-sale, realized loss Equity Securities, FV-NI, Realized Loss Consideration Transferred Business Combination, Consideration Transferred [Abstract] Product and Service [Domain] Product and Service [Domain] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction DEFERRED INCOME TAXES, net of current portion Deferred Income Taxes and Other Assets, Noncurrent Stated interest rate of debt instrument Stated interest rate of debt instrument Debt Instrument, Interest Rate, Stated Percentage 2019 Syndicated Revolving Credit Facility 2019 Bank of America Revolving Credit Facility [Member] 2019 Bank of America Revolving Credit Facility [Member] Schedule of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Derivative Contract [Domain] Derivative Contract [Domain] Summary of Assets Held for Sale and Liabilities Associated with Assets Held for Sale Summary of Assets Held for Sale and Liabilities Associated with Assets Held for Sale [Table Text Block] Summary of Assets Held for Sale and Liabilities Associated with Assets Held for Sale [Table Text Block] Mortgage and other asset-backed securities Mortgage And Other Assets Backed Securities [Member] Mortgage And Other Assets Backed Securities Measurement Frequency [Axis] Measurement Frequency [Axis] Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Schedule of Floor Plan Notes Payable Schedule of Debt [Table Text Block] Notional Principal at Inception Derivative Liability, Notional Amount Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Available-for-Sale, Amortized Cost Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] Basic— Earnings Per Share, Basic [Abstract] Geographical [Axis] Geographical [Axis] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Net income (in dollars per share) Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Equity securities, available-for-sale, realized gain Equity Securities, FV-NI, Realized Gain Income taxes paid, net Income Taxes Paid, Net Total current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Other interest expense, net Interest Expense [Member] New Mexico NEW MEXICO Interest Rate Swap, November 2013 Interest Rate Swap 4 [Member] Interest Rate Swap 4 Comprehensive income Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent TOTAL COST OF SALES Cost of Revenue Deferred revenue Contract with Customer, Liability Investment Investment, Policy [Policy Text Block] Unrealized losses on investments Unrealized Gain (Loss) on Investments Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Schedule of Business Organization Schedule of Business Organization [Table] Schedule of Business Organization [Table] Other comprehensive income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Treasury stock, at cost; 21,968,497 and 21,914,251 shares, respectively Treasury Stock, Value WEIGHTED AVERAGE SHARES OUTSTANDING: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Other long-term liabilities Other Noncurrent Liabilities [Member] Floor plan notes payable—non-trade, net Floor plan notes payable—non-trade, net Floor Plan Notes Payable Non Trade Amounts borrowed to finance the purchase of specific new and, to a lesser extent, used vehicle inventories with non-trade lenders (lenders that are not captive finance subsidiaries of the manufacturer). Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Property and equipment, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Corporate Corporate Debt Securities [Member] Depreciation and amortization Depreciation, Depletion and Amortization Interest Rate Swap, May 2021 Interest Rate Swap, May 2021 [Member] Interest Rate Swap, May 2021 Number of collision centers acquired (in collision repair centers) Number of Collision Centers Acquired Number of Collision Centers Acquired Number of franchises (in franchises) Number of Franchises Number of Franchises Acquisitions Business Combinations Policy [Policy Text Block] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Inventories Increase (Decrease) in Inventories Balance as of January 1, 2022 Balance as of June 30, 2022 Contract with Customer, Asset, after Allowance for Credit Loss Change in right-of-use assets Change in Operating Lease, Right of Use Asset Change in Operating Lease, Right of Use Asset Other operating expense (income), net Other Operating Income (Expense), Net Financial Instruments [Domain] Financial Instruments [Domain] Accounts payable and accrued liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Results Recognized in Accumulated Other Comprehensive Income/(Loss) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax Derivative [Table] Derivative [Table] Floor plan notes payable offset account Floor Plan Notes Payable Non Trade, Offsets Floor Plan Notes Payable Non Trade, Offsets Due in 5-10 years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Parts and service Cost of Goods and Services Sold REVENUE: Revenues [Abstract] LHM LHM [Member] LHM Document Period End Date Document Period End Date Number of vehicle brands (in vehicle brands) Number of Vehicle Brands Number of Vehicle Brands Divestitures Proceeds from Divestiture of Businesses Entity Central Index Key Entity Central Index Key Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Capital expenditures—excluding real estate Payments to Acquire Property, Plant, and Equipment, Excluding Real Estate Payments to Acquire Property, Plant, and Equipment, Excluding Real Estate Loss on changes in fair value of debt securities, net of $0.2 tax benefit OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Total Fair Value, Inputs, Level 1, 2 and 3 [Member] Capital expenditures—real estate Payments to Acquire Real Estate Income Statement Location [Domain] Income Statement Location [Domain] Investments, fair value Investments, Fair Value Disclosure Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Held-for-sale Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Due in 1 year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Loss Contingencies [Line Items] Loss Contingencies [Line Items] Interest receivable Interest Receivable PROPERTY AND EQUIPMENT, net Property, Plant and Equipment, Net OTHER LONG-TERM LIABILITIES Other Liabilities, Noncurrent Business Organization [Line Items] Business Organization [Line Items] Business Organization [Line Items] Lender Name [Axis] Lender Name [Axis] Schedule of Long-term Debt Schedule of Long-term Debt Instruments [Table Text Block] Share repurchases (in shares) Treasury Stock, Shares, Acquired Debt Instrument [Line Items] Debt Instrument [Line Items] Trading Symbol Trading Symbol Schedule of Long Lived Assets Held-for-sale [Table] Schedule of Long Lived Assets Held-for-sale [Table] EARNINGS PER SHARE: Earnings Per Share [Abstract] Total Gross Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Other current assets Increase (Decrease) in Other Operating Assets TOTAL REVENUE Revenues Revenues Add—unamortized premium Debt Instrument, Unamortized Premium Other current liabilities Other Current Liabilities [Member] Proceeds from the sale of debt securities—available-for-sale Proceeds from Sale of Debt Securities, Available-for-sale Contracts-in-transit Contracts In Transit Contracts-in-transit represent receivables from third-party finance companies for the portion of new and used vehicle purchase price financed by customers through sources arranged by us. Mid-line Import Brands Mid-line Import Brands [Member] Mid-line Import Brands [Member] Floor plan borrowings for puchase of related inventory Business Combination, Consideration Transferred, Liabilities Incurred Entity Current Reporting Status Entity Current Reporting Status Loaner vehicles transferred from other current assets to inventory Loaner Vehicles, Amount Transferred from Other Current Assets to Inventory Loaner vehicles transferred from other current assets to inventory on the condensed consolidated balance sheets Investments [Domain] Investments [Domain] Total accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current 2013 BofA Real Estate Facility 2013 BofA Real Estate Facility [Member] 2013 BofA Real Estate Facility [Member] Lower of cost or market inventory reserves Inventory Valuation Reserves Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Cash and cash equivalents CASH AND CASH EQUIVALENTS, beginning of period CASH AND CASH EQUIVALENTS, end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Balance (in shares) Balance (in shares) Shares, Issued Reastated Credit Agreement Reastated Credit Agreement [Member] Reastated Credit Agreement [Member] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] CURRENT ASSETS: Assets, Current [Abstract] Income Taxes Income Tax, Policy [Policy Text Block] Used vehicle wholesale Used vehicle wholesale [Member] Used vehicle wholesale [Member] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Other interest expense, net Interest Expense, Other Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Number of dealership locations acquired (in dealership locations) Number of Dealership Locations Acquired Number of Dealership Locations Acquired Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Debt Instrument, Variable Rate, Minimum Debt Instrument, Variable Rate, Minimum Debt Instrument, Variable Rate, Minimum 4.50% Senior Notes due 2028 Four Point Five Zero Percent Senior Notes due 2028 [Member] Four Point Five Zero Percent Senior Notes due 2028 [Member] Recurring Fair Value, Recurring [Member] Used vehicles Used Vehicles [Member] Used Vehicles Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Change in accumulated losses on available-for-sale debt securities OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment and Tax Credit Facility [Axis] Credit Facility [Axis] Entity Address, Address Line One Entity Address, Address Line One Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Floor plan notes payable—trade, net Floor plan notes payable—trade, net Floor Plan Notes Payable Trade Amounts borrowed to finance the purchase of specific new vehicle inventories with the corresponding manufacturers' captive finance subsidiaries ("trade lenders"). Entity Address, Address Line Two Entity Address, Address Line Two Changes in operating assets and liabilities, net of acquisitions and divestitures— Increase (Decrease) in Operating Capital [Abstract] Other current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other CASH FLOW FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Consolidation Consolidation, Policy [Policy Text Block] Entity Shell Company Entity Shell Company Total current liabilities Liabilities, Current Intersegment Eliminations Intersegment Eliminations [Member] Cash, net of cash acquired Payments to Acquire Businesses, Gross Vehicle receivables Vehicle Receivables [Member] Vehicle Receivables [Member] Summary of Assets Acquired and Liabilities Assumed Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Cash and cash equivalents Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Parts and service Revenue from Contract with Customer, Including Assessed Tax Vehicle repair and maintenance services Vehicle repair and maintenance services [Member] Vehicle repair and maintenance services [Member] Proceeds from the sale of equity securities Proceeds from Sale of Equity Securities, FV-NI Current Fiscal Year End Date Current Fiscal Year End Date Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Transferred to receivables from contract assets recognized at the beginning of the period Contract with Customer, Asset, Reclassified to Receivable Investments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Long-term debt, including current portion Long Term Debt and Lease Obligations, Current and Noncurrent, Including Unamortized Premium (Discount) Long Term Debt and Lease Obligations, Current and Noncurrent, Including Unamortized Premium (Discount) Statement [Table] Statement [Table] Other current assets Other Assets, Current Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Assets held for sale Assets Held-for-sale, Not Part of Disposal Group, Current Washington WASHINGTON Statistical Measurement [Axis] Statistical Measurement [Axis] Accounts Receivable Accounts Receivable [Policy Text Block] Mortgage notes payable bearing interest at fixed rates Mortgage notes payable Mortgages [Member] Other investments measured at net asset value Bonds, Available-for-Sale [Member] Bonds, Available-for-Sale Preferred Stock Preferred Stock [Member] GOODWILL Goodwill Goodwill Due after 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Number of real estate properties Number of Real Estate Properties Less than 12 Months, Gross Unrealized Losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Fair Value Measured at Net Asset Value Per Share Fair Value Measured at Net Asset Value Per Share [Member] Adjustments to reconcile net income to net cash provided by operating activities— Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Change in Contract with Customer, Asset [Roll Forward] Change in Contract with Customer, Asset [Roll Forward] Change in Contract with Customer, Asset [Roll Forward] Schedule of Derivative Instruments Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Due in 1 year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Contracts-in-transit, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Contracts-In-Transit Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Contracts-In-Transit 12 Months or Longer, Gross Unrealized Losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss FLOOR PLAN NOTES PAYABLE LONG-TERM DEBT Long-term Debt [Text Block]