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Net deferred income tax liabilities Deferred Tax Assets, Net Weighted Average Discount Rate - Operating Leases Operating Lease, Weighted Average Discount Rate, Percent Schedule of Inventory Schedule of Inventory, Current [Table Text Block] Subsequent Events [Abstract] Subsequent Events [Abstract] American Honda Motor Co., Inc. (Honda and Acura) American Honda Motor Co., Inc. (Honda and Acura) [Member] American Honda Motor Co., Inc. 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[Member] Bank of America, N.A. [Member] Value of business acquired Cash Acquired from Acquisition Outsanding, beginning balance (in shares) Outsanding, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 2022 Long-Term Debt, Maturity, Year One Due in 1-5 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Mortgage Agreement [Domain] Mortgage Agreement [Domain] [Domain] for Mortgage Agreement [Axis] Lease Term and Discount Rate, Lessee Lease Term and Discount Rate, Lessee [Table Text Block] Lease Term and Discount Rate, Lessee [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] Unearned premiums Deferred Tax Liabilities, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Deferred Tax Liabilities, 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Offsets Franchise rights impairment Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Equity [Abstract] Interest Rate Swap Interest Rate Swap [Member] Accounts payable and accrued liabilities Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Total lease liabilities Leases, Liability Leases, Liability Other individually immaterial items Other Noncash Income (Expense), Other Other Noncash Income (Expense), Other 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] Entity Interactive Data Current Entity Interactive Data Current Thereafter Long-Term Debt, Maturity, after Year Five Assets Acquisition [Domain] Assets Acquisition [Domain] Assets Acquisition Schedule of Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on 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LEASES Lessee, Finance Leases [Text Block] Other Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Adjustments Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Adjustments 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 Cash Asset Acquisition, Cash and Equivalents Asset Acquisition, Cash and Equivalents Used Vehicle Floor Plan Facility Asset Acquisition, Used Vehicle Floor Plan Facility Asset Acquisition, Used Vehicle Floor Plan Facility CURRENT LIABILITIES: Liabilities, Current [Abstract] Receivable [Domain] Receivable [Domain] 4.75% Senior Notes due 2030 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] INVENTORIES Inventory Disclosure [Text Block] Accounting 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Finance Lease, Weighted Average Discount Rate, Percent Total Liabilities associated with assets held for sale Disposal Group, Including Discontinued Operation, Liabilities Outstanding, beginning balance, weighted average grant date fair value (in dollars per share) Outstanding, ending balance, weighted average grant date fair value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Accrued advertising Accrued Advertising ACQUISITIONS AND DIVESTITURES Business Combination and Divestitures Disclosure [Text Block] Business Combination and Divestitures Disclosure [Text Block] LEASES Lessee, Operating Leases [Text Block] Long-term lease obligation Operating Lease, Liability, Noncurrent1 Operating Lease, Liability, Noncurrent1 2018 BofA Real Estate Facility 2018 BofA Real Estate Facility [Member] 2018 BofA Real Estate Facility [Member] ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Change in fair value of cash flow swaps, net of reclassification adjustment tax charge (benefit) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax INVESTMENTS Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Legal Entity [Axis] Legal Entity [Axis] Other accrued liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Pro Forma Net Income Business Acquisition, Pro Forma Net Income (Loss) Schedule of Revenues by Major Brand [Table] Schedule of Revenues by Major Brand [Table] Schedule of Revenues by Major Brand [Table] 2021 Real Estate Facility 2021 Real Estate Facility 2021 Real Estate Facility [Member] 2021 Real Estate Facility Capital expenditures Payments to Acquire Productive Assets Thereafter Finance Lease, Liability, to be Paid, after Year Five Customer we owe liabilities Accrued Liabilities, Current Entity 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Operating lease liabilities Operating Lease Liability, Operating Activities Operating Lease Liability, Operating Activities Toyota Motor Sales, U.S.A., Inc. (Toyota and Lexus) Toyota Motor Sales, U.S.A., Inc. (Toyota and Lexus) [Member] Toyota Motor Sales, U.S.A., Inc. (Toyota and Lexus) [Member] Award Type [Axis] Award Type [Axis] CASH FLOW FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, Maturity [Table Text Block] Total shareholders' equity Stockholders' Equity Attributable to Parent Maximum annual contribution per employee Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount 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 Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Expected future recognition of unrecognized compensation expense related to nonvested share-based awards, 2024 Employee Service 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Share-based Compensation Arrangement by Share-based Payment Award, Percent of Target Number of Shares Earned Employer matching contribution after one year of employment, percent Defined Contribution Plan, Employer Matching Contribution, Percent of Match Total deferred income tax liabilities Deferred Tax Liabilities, Gross Business Acquisition [Line Items] Business Acquisition [Line Items] New vehicle New vehicle [Member] New vehicle [Member] Assets: Disposal Group, Including Discontinued Operation, Assets [Abstract] Statement of Income: Income Statement [Abstract] Entity Registrant Name Entity Registrant Name Asset Class [Domain] Asset Class [Domain] Accounts receivable, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 2024 Finance Lease, Liability, to be Paid, Year Three 2025 Finance Lease, Liability, to be Paid, Year Four Parts and services Parts and services [Member] Parts and services [Member] Income tax expense 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Liability, Notional Amount Lease, Cost Lease, Cost [Table Text Block] Available-for-Sale, Amortized Cost Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] Geographical [Axis] Geographical [Axis] Weighted average interest rate Long-term Debt, Weighted Average Interest Rate, at Point in Time Total assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Interest Expense Interest Expense [Member] Operating lease right-of-use assets Deferred Tax Assets, Right of Use Assets Deferred Tax Assets, Right of Use Assets SUBSEQUENT EVENTS Subsequent Events [Text Block] TOTAL COST OF SALES Cost of Revenue Investments Investment, Policy [Policy Text Block] Unrealized gains on investments Unrealized Gain (Loss) on Investments Net cash provided by (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] Treasury stock, at cost; 21,914,251 and 21,848,314 shares, respectively Treasury Stock, Value WEIGHTED AVERAGE COMMON SHARES OUTSTANDING: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Floor plan notes payable—non-trade, net Total 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). Schedule of Restricted Stock Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block] Finance Lease, Liability, Maturity Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Employers matching contribution, vesting period after date of hire (in years) Defined Contribution Plan, Employers Matching Contribution, Vesting Period Defined Contribution Plan, Employers Matching Contribution, Vesting Period Depreciation Deferred Tax Liabilities, Depreciation Deferred Tax Liabilities, Depreciation Deferred income tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Acquisitions Business Combinations Policy [Policy Text Block] Payment of liquidated damages Termination of Business Acquisition, Payment of Liquidated Damages Termination of Business Acquisition, Payment of Liquidated Damages 2019 Syndicated Revolving Credit Facility 2019 Bank of America Revolving Credit Facility [Member] 2019 Bank of America Revolving Credit Facility Change in right-of-use asset Change in Operating Lease, Right of Use Asset Change in Operating Lease, Right of Use Asset Accounts payable and accrued liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable Derivative [Table] Derivative [Table] REVENUE: Revenues [Abstract] LHM Acquisition LHM [Member] LHM Document Period End Date Document Period End Date Schedule of Mortgage Notes Payable Schedule of Mortgage Notes Payable [Table Text Block] Schedule of Mortgage Notes Payable [Table Text Block] Unrealized gains on available-for-sale debt securities Unrealized gains on available-for-sale debt securities, net of $0 tax charge OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Total Fair Value, Inputs, Level 1, 2 and 3 [Member] State income tax expense, net Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent State Deferred State and Local Income Tax Expense (Benefit) Schedule of Estimated Useful Lives Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Income Statement Location [Domain] Income Statement Location [Domain] Total Investments, at 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] Transaction costs Business Acquisition, Transaction Costs Interest receivable Interest Receivable PROPERTY AND EQUIPMENT, net Property, Plant and Equipment, Net Number of franchise, sold (in franchises) Number of franchise, sold Number of franchise, sold Business Organization [Line Items] Business Organization [Line Items] Business Organization [Line Items] Other, net Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount Repayment schedule Line of Credit Facility, Repayment Schedule Line of Credit Facility, Repayment Schedule EARNINGS PER COMMON SHARE: Earnings Per Share [Abstract] TOTAL REVENUE Revenues Revenues Audit Information [Abstract] Audit Information Consideration transferred Asset Acquisition, Consideration Transferred Total right-of-use assets Leases, Right-of-Use Asset Leases, Right-of-Use Asset Entity Current Reporting Status Entity Current Reporting Status Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Asset Acquisition [Line Items] Asset Acquisition [Line Items] Income tax provision Effective Income Tax Rate Reconciliation, Percent Total accounts receivable Accounts Receivable, before Allowance for Credit Loss, Current Floor plan borrowings—acquisitions Floor Plan Borrowings, Acquisitions Borrowings of floor plan notes payable to parties other than the manufacturer related to the acquisition of dealerships. New Vehicle Floor Plan Facility Asset Acquisition, New Vehicle Floor Plan Facility Asset Acquisition, New Vehicle Floor Plan Facility Amortization of debt issuance costs Amortization of Debt Issuance Costs Nissan North America, Inc. (Nissan and Infiniti) Nissan North America, Inc. (Nissan and Infiniti) [Member] Nissan North America, Inc. (Nissan and Infiniti) [Member] Balance (in shares) Balance (in shares) Shares, Issued Reastated Credit Agreement Reastated Credit Agreement [Member] Reastated Credit Agreement [Member] Revenues by major brand, disclosure percentage threshold Entity-Wide Revenues, Major Brands, Disclosure Percentage Threshold Entity-Wide Revenues, Major Brands, Disclosure Percentage Threshold Leases [Abstract] Leases [Abstract] Income Taxes Income Tax, Policy [Policy Text Block] LIBOR London Interbank Offered Rate (LIBOR) [Member] Used vehicle wholesale Used vehicle wholesale [Member] Used vehicle wholesale [Member] Schedule of Performance Share Units Schedule of Nonvested Performance-based Units Activity [Table Text Block] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Schedule of Accounts Payable and Accrued Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Other interest expense, net Interest Expense, Other Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Sale and leaseback transaction Sale Leaseback Transaction Sale Leaseback Transaction 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 4.50% Senior Notes due 2028 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] INCOME TAXES Income Tax Disclosure [Text Block] Used vehicle 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] Property and equipment Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant and Equipment Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant and Equipment Credit Facility [Axis] Credit Facility [Axis] Indefinite-lived Intangible Assets [Line Items] Indefinite-lived Intangible Assets [Line Items] Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Assets And Liabilities, Lessee Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] 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 DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Business Description and Accounting Policies [Text Block] Operating Lease, Liability Held-for-Sale, Current Operating Lease, Liability Held-for-Sale, Current Operating Lease, Liability Held-for-Sale, Current Total current liabilities Liabilities, Current Intersegment Eliminations Intersegment Eliminations [Member] Operating lease liabilities Deferred Tax Liabilities, Operating Lease Liabilities Deferred Tax Liabilities, Operating Lease Liabilities Purchase price Asset Acquisition, Purchase Price Asset Acquisition, Purchase Price 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 Revenue Revenue from Contract with Customer, Including Assessed Tax Employer matching contribution, percent of employees' gross pay Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay 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 Unamortized premium and debt issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net 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 Restricted payments, aggregate amount Restricted Payments, Aggregate Amount Restricted Payments, Aggregate Amount Statement [Table] Statement [Table] Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Other, net Deferred Tax Assets, Other Total unrecognized share-based compensation expense related to nonvested awards Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Statistical Measurement [Axis] Statistical Measurement [Axis] Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] Other investments measured at net asset value Bonds, Available-for-Sale [Member] Bonds, Available-for-Sale Liabilities, Non-Current, Finance Long-term lease obligation Finance Lease, Liability, Noncurrent GOODWILL Goodwill Net, beginning balance Net, ending balance Goodwill Number of real estate properties Number of Real Estate Properties Franchise rights Franchise Rights [Member] Less than 12 Months, Gross Unrealized Losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Investments measured at net asset value Fair Value Measured at Net Asset Value Per Share [Member] Measurement period adjustment to property and equipment Asset Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment Asset Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment 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] Operating lease cost Operating Lease, Cost Total assets acquired Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 12 Months or Longer, Gross Unrealized Losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Maximum annual contributions per employee, percent Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Total Deferred Income Tax Expense Deferred Income Tax Expense (Benefit) Deferred income taxes Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Type of Brand [Domain] Type of Brand [Domain] Type of Brand [Domain] Goodwill Disposal Group, Including Discontinued Operation, Goodwill New and used vehicle New and used vehicle [Member] New and used vehicle [Member] Income tax provision at the statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Earnings per Common Share Earnings Per Share, Policy [Policy Text Block] Schedule of Revenues by Major Brand [Line Items] Schedule of Revenues by Major Brand [Line Items] [Line Items] for Schedule of Revenues by Major Brand [Table] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] NET INCOME Net income Net Income (Loss) Attributable to Parent Total maturities of long-term debt Long Term Debt and Lease Obligations1 Long Term Debt and Lease Obligations1 OPERATING LEASE RIGHT-OF-USE ASSETS Operating lease, right-of-use asset Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Accrued compensation Employee-related Liabilities, Current Number of subsidiaries Number of Subsidiaries Number of Subsidiaries 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. Assets held for sale Operating Lease, Asset Held-for-Sale Operating Lease, Asset Held-for-Sale Income Statement Location [Axis] Income Statement Location [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] 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 Segment Reporting Segment Reporting, Policy [Policy Text Block] 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 Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Share Repurchase 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 Number of franchises acquired (in franchises) Number of Businesses Acquired Segments [Axis] Segments [Axis] Entity File Number Entity File Number Redemption price, percentage Debt Instrument, Redemption Price, Percentage Stand-alone used vehicle dealerships (in dealership) Stand-alone used vehicle dealerships Stand-alone used vehicle dealerships 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 Deferred Revenue Deferred Tax Assets, Tax Deferred Expense, Deferred Revenue Deferred Tax Assets, Tax Deferred Expense, Deferred Revenue Loaner vehicles notes payable Notes Payable, Loaner Vehicle, Current Notes Payable, Loaner Vehicle, Current Other current assets Other Current Assets [Member] Variable lease cost Variable Lease, Cost LONG-TERM DEBT Long-term debt Long-term Debt and Lease Obligation Prepaid taxes Prepaid Taxes 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] Total fair value of performance share units vested (in millions) Total fair value of restricted stock awards vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Granted, weighted average grant date fair value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Commitment fee percentage Line of Credit Facility, Commitment Fee Percentage Daily Simple SOFR Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Municipal Municipal Bonds [Member] BMW of North America, LLC (BMW and MINI) BMW of North America, LLC (BMW and Mini) [Member] BMW of North America, LLC (BMW and Mini) [Member] INVESTMENTS Investments Noncurrent Investments Noncurrent Gross property and equipment Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, before Accumulated Depreciation and Amortization Sale of vehicle parts and accessories Sale of vehicle parts and accessories [Member] Sale of vehicle parts and accessories [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Unrealized gains on available-for-sale debt securities, tax OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Deferred Sales Commissions Deferred Commissions [Member] Deferred Commissions Unclaimed property Unclaimed Property Unclaimed Property Credit Facility [Domain] Credit Facility [Domain] ASSETS Assets [Abstract] Subsegments [Axis] Subsegments [Axis] 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 2024 Long-Term Debt, Maturity, Year Three Schedule of Floor Plan Notes Payable - Non-Trade Floor Plan Notes Payable - Non-Trade [Table Text Block] Floor Plan Notes Payable - Non-Trade [Table Text Block] Land Land [Member] Other Liabilities Other Liabilities [Member] Floor plan notes payable—trade Floor Plan Notes Payable Trade, Gross Floor Plan Notes Payable Trade, Gross Right-of-use assets obtained in exchange for new finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period GOODWILL AND INTANGIBLE FRANCHISE RIGHTS Goodwill and Intangible Assets Disclosure [Text Block] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Manufacturer franchise rights Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets Debt Instrument [Axis] Debt Instrument [Axis] Advertising Advertising Cost [Policy Text Block] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Divestitures Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit Series of Individually Immaterial Business Acquisitions Series of Individually Immaterial Business Acquisitions [Member] Company vehicles Company Vehicles [Member] Company Vehicles [Member] Retirement of previously repurchased common stock Repurchase or retirement of previously repurchased common stock Stock Repurchased and Retired During Period, Value Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Inventories, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Schedule of Pro Forma Information Business Acquisition, Pro Forma Information [Table Text Block] Asset Purchase Agreement Asset Purchase Agreement [Member] Asset Purchase Agreement Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] 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 Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Gain on dealership divestitures, net Gain on divestitures Gain (Loss) on Disposition of Business Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Three 6.0% Senior Subordinated Notes due 2024 Six Point Zero Percent Senior Subordinated Notes Due 2024 [Member] Six Point Zero Percent Senior Subordinated Notes Due 2024 [Member] Goodwill Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Goodwill Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Goodwill General restricted payments allowance General Restricted Payments Allowance General Restricted Payments Allowance Used vehicle retail Used vehicle retail [Member] Used vehicle retail [Member] Purchases of equity securities Payments to Acquire Equity Securities, FV-NI New Vehicle Revolving Floor Plan Facility New Vehicle Floor Plan [Member] New Vehicle Floor Plan [Member] Deposits Prepaid Expense, Current Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] 2026 Long-Term Debt, Maturity, Year Five Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] 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 Number of shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Operating cash flows from operating leases Operating Lease, Payments Aggregate purchase price Business Combination, Consideration Transferred Goodwill [Roll Forward] Goodwill [Roll Forward] Long-term debt, gross Long-term Debt, Gross Reduction of new vehicle inventory cost by automobile manufacturer incentives Inventory Adjustments Finance lease Assets, Finance Finance Lease, Right-of-Use Asset, after Accumulated Amortization Accrued insurance Accrued Insurance, Current 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 Total liabilities and shareholders' equity Liabilities and Equity Other Other Accrued Liabilities, Current Net assets acquired Asset Acquisition, Recognized Identifiable Assets Acquired, Goodwill and Liabilities Assumed, Net Asset Acquisition, Recognized Identifiable Assets Acquired, Goodwill and Liabilities Assumed, Net 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 2026 Lessee, Operating Lease, Liability, to be Paid, Year Five Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Elements [Abstract] Indefinite-lived Intangible Assets Reclassified to Held for Sale Indefinite-lived Intangible Assets Reclassified to Held for Sale Indefinite-lived Intangible Assets Reclassified to Held for Sale Derivative [Line Items] Derivative [Line Items] Derivatives and Fair Value [Abstract] Derivatives and Fair Value [Abstract] Derivatives and Fair Value [Abstract] Accrued licenses and regulatory fees Accrued Licenses And Regulatory Fees, Current Accrued Licenses And Regulatory Fees, Current Schedule of Other Current Assets Schedule of Other Current Assets [Table Text Block] Franchise rights Disposal Group, Including Discontinued Operation, Intangible Assets Loaners, net 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 Disposal Group, Including Discontinued Operation, Assets Purchase of treasury shares Treasury Stock, Value, Acquired, Cost Method OPERATING EXPENSES: Operating Expenses [Abstract] Floor plan notes payable—new non-trade Floor Plan Notes Payable Non Trade, New, Gross Floor Plan Notes Payable Non Trade, New, Gross Number of collision centers, sold (in collision centers) Number of Collision Centers, Sold Number of Collision Centers, Sold Fair value of interest rate swaps Fair value of interest rate swaps assets (liabilities) Interest Rate Cash Flow Hedge Derivative at Fair Value, Net LHM Dealerships LHM Dealerships [Member] LHM Dealerships Standby Letters of Credit Standby Letters of Credit [Member] Minimum Minimum [Member] Other long-term assets and liabilities, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Employee Retirement Plan, Groups of Participants [Domain] Employee Retirement Plan, Groups of Participants [Domain] [Domain] for Employee Retirement Plan, Groups of Participants [Axis] GROSS PROFIT Gross profit Gross Profit 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two Aggregate commitments Long-term Line of Credit Selling, general, and administrative Selling, General and Administrative Expense Less: debt issuance costs Unamortized debt issuance expense Debt Issuance Costs, Net Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Proceeds from the sale of assets Proceeds from Sale of Productive Assets Assets Acquisition [Axis] Assets Acquisition [Axis] Assets Acquisition 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] Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] 12 Months or Longer, Fair Value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Finance and insurance, net Revenue, Finance And Insurance Revenues derived from the arrangement of vehicle financing and the sale of aftermarket products, such as insurance and service contracts. Operating lease right-of-use assets Disposal Group, Including Discontinued Operation, Operating Lease ROU Assets Disposal Group, Including Discontinued Operation, Operating Lease ROU Assets 2025 Long-Term Debt, Maturity, Year Four Age 50 or More Age Fifty or More [Member] Age Fifty or More [Member] SUPPLEMENTAL CASH FLOW INFORMATION Cash Flow, Supplemental Disclosures [Text Block] Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired LONG-TERM DEBT Debt Disclosure [Text Block] Schedule of Components of Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Line of Credit Line of Credit [Member] Senior Notes Senior Notes [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Debt securities, available-for-sale, gain (loss) Debt Securities, Available-for-sale, Gain (Loss) Less—Accumulated depreciation Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, Accumulated Depreciation and Amortization Expected future recognition of unrecognized compensation expense related to nonvested share-based awards, 2023 Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Expected Future Recognition, Year Two Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Expected Future Recognition, Year Two Deferred Tax Liabilities, Investments Deferred Tax Liabilities, Investments Other Purchase price holdbacks Business Combination, Consideration Transferred, Other Number of reportable segments Number of Reportable Segments COST OF SALES: Cost of Revenue [Abstract] Amount of letters of credit outstanding Letters of Credit Outstanding, Amount Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Total other expenses, net Nonoperating Income (Expense) Interest Rate Swap Interest Rate Swap 1 [Member] Interest Rate Swap 1 Goodwill acquired Acquisitions Goodwill, Acquired During Period Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Performance Share Units Performance Shares [Member] COMMITMENTS AND CONTINGENCIES (Note 21) Commitments and Contingencies Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Emerging Growth Company Entity Emerging Growth Company Less—Allowance for credit losses Accounts Receivable, Allowance for Credit Loss, Current Restricted Stock Awards Restricted Stock [Member] SHARE-BASED COMPENSATION AND EMPLOYEE BENEFIT PLANS Compensation and Employee Benefit Plans [Text Block] Payment of debt issuance costs Payments of Debt Issuance Costs Receivables [Abstract] Receivables [Abstract] Proceeds from issuance of debt Proceeds from Issuance of Debt Disposal Group Classification [Axis] Disposal Group Classification [Axis] Colorado COLORADO Impairment of real estate Impairment of Real Estate Auditor Name Auditor Name Cover [Abstract] Cover [Abstract] F&I chargeback liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Loaner vehicles Other Assets, Current, Service Loaner Vehicles Other Assets, Current, Service Loaner Vehicles 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] Consideration transferred, other, release Business Combination, Consideration Transferred, Other, Release Business Combination, Consideration Transferred, Other, Release Less: Amount of lease payments representing interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Used Vehicle Revolving Floor Plan Facility Used Vehicle Revolving Floor Plan Facility [Member] Used Vehicle Revolving Floor Plan Facility [Member] 2015 Wells Fargo Master Loan Facility 2015 Wells Fargo Master Loan Facility [Member] 2015 Wells Fargo Master Loan Facility [Member] Less: Amount of lease payments representing interest Finance Lease, Liability, Undiscounted Excess Amount Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Ford Motor Company (Ford and Lincoln) Ford Motor Company (Ford and Lincoln) [Member] Ford Motor Company (Ford and Lincoln) [Member] 2026 Finance Lease, Liability, to be Paid, Year Five New Vehicle and Used Vehicle Floor Plan New Vehicle and Used Vehicle Floor Plan [Member] New Vehicle and Used Vehicle Floor Plan [Member] Common Stock Common Stock [Member] Inventories Disposal Group, Including Discontinued Operation, Inventory INCOME FROM OPERATIONS Operating Income (Loss) Employer matching contributions Defined Contribution Plan, Employer Discretionary Contribution Amount 4.00% Promissory Note due February 2022 Four Point Zero Zero Percent Promissory Note due February 2022 [Member] Four Point Zero Zero Percent Promissory Note due February 2022 Current maturities of operating leases Liabilities, Current, Operating Operating Lease, Liability, Current Gross Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Share-based compensation Share-based Payment Arrangement, Noncash Expense Cash equivalents Cash and Cash Equivalents, at Carrying Value Proceeds from secondary offering of common stock, net (in shares) Proceeds from Issuance of Common Stock, Secondary Offering, Shares Proceeds from Issuance of Common Stock, Secondary Offering, Shares Indiana INDIANA Treasury Stock Treasury Stock [Member] Accrued finance and insurance chargebacks Accrued Finance and Insurance Chargebacks, Current Accrued Finance and Insurance Chargebacks, Current Real Estate Not Currently Used in Operations Real Estate Not Currently Used in Operations [Member] Real Estate Not Currently Used in Operations [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 Georgia GEORGIA Accounting Policies [Line Items] Accounting Policies [Line Items] Accounting Policies [Line Items] Interest rate Line of Credit Facility, Interest Rate at Period End Deferred income tax assets: Deferred Tax Assets, Net [Abstract] 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 New vehicles New Vehicles [Member] New Vehicles Consolidation Items [Axis] Consolidation Items [Axis] Common stock, shares issued (in shares) Common Stock, Shares, Issued Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Schedule of Components of Inventory [Table] Schedule of Components of Inventory [Table] Schedule of Components of Inventory [Table] 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 Loss on extinguishment of long-term debt, net Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Interest costs capitalized Interest Costs Capitalized Taxes payable Taxes Payable Schedule of Indefinite-Lived Intangible Assets [Table] Schedule of Indefinite-Lived Intangible Assets [Table] Real estate held-for-sale Real Estate Held-for-sale Operating lease right-of-use assets Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Right-of-Use Assets Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Right-of-Use Assets Balance Sheet Location [Axis] Balance Sheet Location [Axis] 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 Total interest expense Interest Expense 2022 Finance Lease, Liability, to be Paid, Year One Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] 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) Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Entity Filer Category Entity Filer Category Income tax benefit (expense) associated with other comprehensive income items Results Recognized in AOCI (Effective Portion) Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent U.S Treasury US Treasury Securities [Member] Federal Funds Federal Funds [Member] Federal Funds [Member] Interest Rate Swap Interest Rate Swap 1.1 [Member] Interest Rate Swap 1.1 [Member] Derivative, Number of Instruments Held Derivative, Number of Instruments Held Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Repayments of revolving credit facility Repayments of Lines of Credit Liabilities: Disposal Group, Including Discontinued Operation, Liabilities [Abstract] OTHER EXPENSES (INCOME): Other Expenses [Abstract] Other long-term assets Other Noncurrent Assets [Member] Beginning balance Ending balance Indefinite-lived Intangible Assets (Excluding Goodwill) Short-term Investments Short-term Investments 2023 Finance Lease, Liability, to be Paid, Year Two Balance Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Mississippi MISSISSIPPI Amendment Flag Amendment Flag Proceeds from borrowings Proceeds from Issuance of Long-term Debt Equity Components [Axis] Equity Components [Axis] Fair Value Disclosures [Abstract] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Asset Acquisition [Table] Asset Acquisition [Table] Inventories, net Total inventories Inventory, Net Schedule of Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Federal Deferred Federal Income Tax Expense (Benefit) 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] Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Number of used cars stores acquired (in used cars 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. Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Entity Public Float Entity Public Float Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Short-term lease cost Short-term Lease, Cost Issuance of common stock in connection with share-based payment arrangements (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Percent of cash proceeds receive from sale of equity interests Restricted Payments Capacity, Percent Of Cash Proceeds Receive From Sale Of Equity Interests Restricted Payments Capacity, Percent Of Cash Proceeds Receive From Sale Of Equity Interests 4.00% Promissory Note due August 2021 Four Point Zero Zero Percent Promissory Note due August 2021 [Member] Four Point Zero Zero Percent Promissory Note due August 2021 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] Number of new vehicle dealerships acquired (in new vehicle dealerships) Number of New Vehicle Dealerships Acquired Number of New Vehicle Dealerships Acquired Statement [Line Items] Statement [Line Items] Finance and insurance Cost Of Sale, Finance And Insurance Cost Of Sale, Finance And Insurance 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 Employee Retirement Plan, Groups of Participants [Axis] Employee Retirement Plan, Groups of Participants [Axis] Employee Retirement Plan, Groups of Participants [Axis] Investments Investments 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 Debt Disclosure [Abstract] Debt Disclosure [Abstract] Purchases of previously leased real estate Payments to Acquire Previously Leased Real Estate Payments to Acquire Previously Leased Real Estate Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] 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 Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Asset Class [Axis] Asset Class [Axis] Document Annual Report Document Annual Report Divestitures Goodwill, Written off Related to Sale of Business Unit Other, net Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent 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 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 Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Total assets Assets Assets Other Other Accrued Liabilities, Noncurrent Plan Name [Domain] Plan Name [Domain] Interest payments made including amounts capitalized Interest Paid, Excluding Capitalized Interest, Operating Activities Geographical [Domain] Geographical [Domain] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction DEFERRED INCOME TAXES, net of current portion Deferred Income Taxes and Other Assets, Noncurrent Schedule of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Derivative Contract [Domain] Derivative Contract [Domain] Customer deposits Contract with Customer, Refund Liability, Current Number of auto auctions (in auto auction) Number of Auto Auctions Number of Auto Auctions Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities [Member] Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] 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] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Furniture and fixtures Furniture and Fixtures [Member] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Other Other Assets, Miscellaneous, Current Debt Issuance Costs Deferred Charges, Policy [Policy Text Block] Basic— Earnings Per Share, Basic [Abstract] Non-deductible/non-tax items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Net income (in dollars per share) Earnings Per Share, Diluted Segments [Domain] Segments [Domain] Initial purchasers' discounts and expenses Amortization of Debt Issuance Costs and Discounts Schedule of Aggregate Maturities Contractual Obligation, Fiscal Year Maturity [Table Text Block] Intangible assets acquired Acquisitions Indefinite-lived Intangible Assets Acquired Income taxes paid Income Taxes Paid, Net Non-deductible/non-tax items Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount Accounting Standards Update [Extensible List] Accounting Standards Update [Extensible Enumeration] Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Assumed contract liabilities Contract with Customer, Liability Other mortgage debt Other Mortgage Debt [Member] Other Mortgage Debt [Member] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] DEFERRED INCOME TAXES Deferred Income Tax Liabilities, Net Other long-term liabilities Other Noncurrent Liabilities [Member] Real estate Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Real Estate Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Real Estate Changes to finance lease right-of-use asset resulting from lease reassessment event Changes To Finance Lease Right-Of-Use Asset Resulting From Lease Reassessment Event Changes To Finance Lease Right-Of-Use Asset Resulting From Lease Reassessment Event 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 Number of equal monthly principal payments Line of Credit Facility, Number of Equal Monthly Principal Payments Line of Credit Facility, Number of Equal Monthly Principal Payments Loaner vehicles Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loaner Vehicles Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loaner Vehicles Corporate Corporate Debt Securities [Member] Reconciliation of the Statutory Federal Rate to the Effective Rate Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Total liabilities assumed Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Schedule of Revenue by Major Brand Schedule of Revenue by Major Brand [Table Text Block] Schedule of Revenue by Major Brand [Table Text Block] Accounts payable Accounts Payable, Current Subsegments [Domain] Subsegments [Domain] Depreciation and amortization Depreciation and capital lease obligation amortization Depreciation, Depletion and Amortization Less: current obligations under leases Operating Lease, Liability, Including Held-For-Sale, Current Operating Lease, Liability, Including Held-For-Sale, Current Number of collision centers acquired (in collision centers) Number of Collision Centers Acquired Number of Collision Centers Acquired Number of franchises (in franchises) Number of Franchises Number of Franchises Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Inventories Increase (Decrease) in Inventories Beginning balance Ending balance Contract assets Contract with Customer, Asset, after Allowance for Credit Loss Other operating (income) expense, net Other Operating Income (Expense), Net Mercedes-Benz USA, LLC (Mercedes-Benz and Sprinter) Mercedes-Benz USA, LLC (Mercedes-Benz, Smart and Sprinter) [Member] Mercedes-Benz USA, LLC (Mercedes-Benz, Smart and Sprinter) [Member] 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 Number of vehicle brands (in vehicle brands) Number of Vehicle Brands Number of Vehicle Brands Reclassified (to) from assets held for sale Goodwill, Reclassified From (To) Assets Held-for-sale Goodwill, Reclassified From (To) Assets Held-for-sale Divestitures Proceeds from divestiture Proceeds from Divestiture of Businesses Entity Central Index Key Entity Central Index Key Texas TEXAS Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Revenues by major brand, percentage Entity-Wide Revenues, Major Brand, Percentage Entity-Wide Revenues, Major Brand, Percentage Total lease cost Lease, Cost Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Capital expenditures—real estate Payments to Acquire Real Estate Due in 1 year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Other liabilities Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Liabilities Asset Acquisition, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Liabilities Compensation Related Costs [Abstract] Compensation Related Costs [Abstract] Loss Contingencies [Line Items] Loss Contingencies [Line Items] PROPERTY AND EQUIPMENT, NET Property, Plant and Equipment Disclosure [Text Block] Virginia VIRGINIA Seller Note Seller Note [Member] Seller Note OTHER LONG-TERM LIABILITIES Other long-term liabilities Other Liabilities, Noncurrent Schedule of Long-term Debt Schedule of Long-term Debt Instruments [Table Text Block] Lender Name [Axis] Lender Name [Axis] Purchase of treasury shares (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] Pro Forma Revenue Business Acquisition, Pro Forma Revenue ACCOUNTS PAYABLE AND ACCRUED LIABILITIES Accounts Payable and Accrued Liabilities Disclosure [Text Block] Other, net Deferred Tax Liabilities, Other Total Gross Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Other current assets Increase (Decrease) in Other Operating Assets Add: unamortized premium Unamortized premium Debt Instrument, Unamortized Premium Current borrowing capacity Line of Credit Facility, Current Borrowing Capacity South Carolina SOUTH CAROLINA Number of instruments provided for grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Instruments Provided for Grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Instruments Provided for Grant Other current liabilities Other Current Liabilities [Member] Gain on divestitures Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Proceeds from the sale of debt securities—available-for-sale Proceeds from Sale of Debt Securities, Available-for-sale Share-based compensation expense Share-based Payment Arrangement, Expense Payable to sellers Business Combination, Consideration Transferred, Liabilities Incurred 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 One month LIBOR One Month London Interbank Offered Rate [Member] One Month London Interbank Offered Rate [Member] Investments [Domain] Investments [Domain] 2013 BofA Real Estate Facility 2013 BofA Real Estate Facility [Member] 2013 BofA Real Estate Facility [Member] 2019 Senior Credit Facility 2019 Senior Credit Facility [Member] 2019 Senior Credit Facility Payables and Accruals [Abstract] Payables and Accruals [Abstract] Lower of cost or market inventory reserves Inventory Valuation Reserves Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities FLOOR PLAN NOTES PAYABLE—NON-TRADE Floor Plan Notes Payable Non-Trade [Text Block] Floor Plan Notes Payable Non-Trade [Text Block] Construction in progress Construction in Progress [Member] Deferred payroll tax Deferred Payroll Tax, Noncurrent Deferred Payroll Tax, Noncurrent 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] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] CURRENT ASSETS: Assets, Current [Abstract] Accrued finance and insurance chargebacks Accrued Finance and Insurance Chargebacks, Noncurrent Accrued Finance and Insurance Chargebacks, Noncurrent Schedule of Other Long-Term Liabilities Schedule of Other Long-Term Liabilities [Table Text Block] Schedule of Other Long-Term Liabilities [Table Text Block] Recurring Fair Value, Recurring [Member] 2019 Plan 2019 Equity and Incentive Compensation Plan [Member] 2019 Equity and Incentive Compensation Plan [Member] Accrued interest Interest Payable, Current Senior Credit Facility Senior Credit Facility [Member] Senior Credit Facility [Member] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Self-insurance Programs Self Insurance Reserve [Policy Text Block] OTHER CURRENT ASSETS Other Current Assets [Text Block] Auditor Firm ID Auditor Firm ID Interest rate swap Interest Rate Swap Liabilities, Noncurrent Interest Rate Swap Liabilities, Noncurrent Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Floor plan notes payable—trade, net Total 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"). Buildings and improvements Buildings and leasehold improvements Building and Building Improvements [Member] Changes in operating assets and liabilities, net of acquisitions and divestitures— Increase (Decrease) in Operating Capital [Abstract] Vested, weighted average grant date fair value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Cash, net of cash acquired Cash paid for acquisition Payments to Acquire Businesses, Gross Vehicle receivables Vehicle Receivables [Member] Vehicle Receivables [Member] Operating cash flows from finance lease Finance Lease, Interest Payment on Liability Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] 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) Other current assets Other current assets Other Assets, Current Transaction costs Assets Acquisition, Transaction Costs Assets Acquisition, Transaction Costs Advertising expense Advertising Expense Assets held for sale Assets Held-for-sale, Not Part of Disposal Group, Current Operating Lease, Liability Held-for-Sale, Noncurrent Operating Lease, Liability Held-for-Sale, Noncurrent Operating Lease, Liability Held-for-Sale, Noncurrent Prepaid taxes Deposits Assets, Current Income tax provision at the statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Mortgages Mortgages Notes Payable Mortgages [Member] Restricted payments capacity, percent of net income Restricted Payments Capacity, Percent Of Net Income Restricted Payments Capacity, Percent Of Net Income Extinguishment of debt, amount Extinguishment of Debt, Amount Due after 10 years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Write-off of unamortized debt issuance costs Write off of Deferred Debt Issuance Cost Inventories Inventory, Policy [Policy Text Block] Indefinite-lived Intangible Assets [Roll Forward] Indefinite-lived Intangible Assets [Roll Forward] 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 Accounting Standards Update 2018-02 [Member]