Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Senior Subordinated Notes Subordinated Debt Maximum Maximum [Member] Lease, Liability, Noncurrent, Amortization Total Lease, Liability, Noncurrent, Amortization Total Lease, Liability, Noncurrent, Amortization Total Title of 12(b) Security Title of 12(b) Security Net Income (Loss), Diluted earnings (loss) Net Income (Loss) Available to Common Stockholders, Diluted ROU asset ROU asset [Member] ROU asset Indefinite-Lived Franchise Rights Indefinite-Lived Franchise Rights Debt weighted average interest rate on note Debt, Weighted Average Interest Rate Summary of Lease Exit Accruals SummaryOfLeaseExitAccrualsTableTableTextBlock Adjustment to Compensation, Amount Adjustment to Compensation Amount General indemnifications minimum expiration period GeneralIndemnificationsMinimumExpirationPeriod Segment Reporting [Abstract] Service loaners InventoryServiceLoaners Nature of Expense [Axis] Nature of Expense [Axis] Fleet New Vehicles [Member] Fleet New Vehicles [Member] Fleet New Vehicles Franchise assets Franchise Rights [Member] Finance Lease, Liability, Payments, Due Next Twelve Months Finance Lease, Liability, to be Paid, Year One Derivative Instrument [Axis] Derivative Instrument [Axis] Basic earnings (loss) IncomeLossFromDiscontinuedOperationsNetOfTaxBasicAfterEffectOfParticipatingSecurities Other comprehensive income (loss) before reclassifications, tax expense Other Comprehensive Income (Loss) before Reclassifications, Tax Measurement Frequency [Axis] Measurement Frequency [Axis] Proceeds from Divestiture of Businesses Proceeds from Divestiture of Businesses Debt Instrument Credit Spread Adjustment On Variable Rate Debt Instrument Credit Spread Adjustment On Variable Rate Debt Instrument Credit Spread Adjustment On Variable Rate Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Franchisor Disclosure [Domain] Franchisor Disclosure [Domain] Franchised Dealerships Segment FranchisedDealershipsMember Segment [Domain] Business Segments [Domain] Segments [Domain] Operating Leases, Future Minimum Payments Receivable [Abstract] (Deprecated 2026) Operating Leases, Future Minimum Payments Receivable [Abstract] (Deprecated 2026) Discrete benefit related to vested or exercised stock compensation Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount Lessee, Operating Lease, Liability, to be Paid, after Year Five Lessee, Operating Lease, Liability, to be Paid, after Year Five Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Contingent liability reserve balance after reduction ContingentLiabilityReserveBalance Other amortization Other Depreciation and Amortization Cash Flow Swap E CashFlowSwapFourMember Leases [Abstract] Common stock, par value (usd per share) Common Stock, Par or Stated Value Per Share Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Goodwill Adjustment [Domain] Goodwill Adjustment [Domain] Goodwill Adjustment [Domain] Lease Liability Current Total Lease Liability Current Total Lease Liability Current Total Other Intangible Assets, net Intangible assets Intangible Asset, Excluding Goodwill, after Accumulated Amortization Total revenues DisposalGroupNotDiscontinuedOperationRevenue Gain on Franchise Disposal Gain (Loss) on Franchise Disposal Gain (Loss) on Franchise Disposal Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Total current liabilities Liabilities, Current Interest Rate Cap 5 Interest Rate Cap 5 [Member] Interest Rate Cap 5 4.875 Notes Text [Text Block] 4.875 Notes Text [Text Block] 4.875 Notes Text Debt Instrument, Redemption, Period Five Debt Instrument, Redemption, Period Five [Member] Franchised Used Vehicles Cost of Sales Franchised Used Vehicles Cost of Sales Franchised Used Vehicles Cost of Sales Lease, Cost [Abstract] Lease, Cost [Abstract] Entity Address, City or Town Entity Address, City or Town Fair value of derivative Derivative, Fair Value, Net NumberofPreownedStoresDisposed NumberofPreownedStoresDisposed NumberofPreownedStoresDisposed Statement of Financial Position [Abstract] Definite life intangibles Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Interest rate Line of Credit Facility, Interest Rate at Period End Fair Value Based on Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Other income (expense): Nonoperating Income (Expense) [Abstract] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Lessor, Operating Lease, Payments to be Received, Three Years Lessor, Operating Lease, Payment to be Received, Year Three Other Expenses Other Expenses Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Business Combination, Recognized Liability Assumed, Other Liability, Current Business Combination, Recognized Liability Assumed, Other Liability, Current Summary of Reportable Operating Segment Segment Reporting [Table Text Block] Other comprehensive income (loss) before taxes: Other Comprehensive Income (Loss), before Tax [Abstract] Impairment of Long-Lived Assets to be Disposed of Impairment of Long-Lived Assets to be Disposed of Finance Lease, Liability, Current, Modifications Finance Lease, Liability, Current, Modifications Finance Lease, Liability, Current, Modifications Revenue from Contract with Customers Revenue from Contract with Customer [Policy Text Block] Other comprehensive income (loss) Change in fair value of interest rate swap and interest rate cap agreements, net of tax expense of $1,563 Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Period Two Debt Instrument, Redemption, Period Two [Member] Reductions from impairment, total Reductions from impairment, total Reductions from impairment, total Lessee, Operating Lease, Liability, Maturity Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] SUPPLEMENTAL SCHEDULE OF NON-CASH FINANCING ACTIVITIES: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Document Period End Date Document Period End Date PY Acq GW Allocations Preowned PY Acq GW Allocations Preowned PY Acq GW Allocations Preowned Principal amount Debt Instrument, Face Amount Gain (Loss) on Sale of Properties Gain (Loss) on Sale of Properties Discrete charge for non-deductible executive compensation, transition costs Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Officer Compensation, Transition Cost Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Officer Compensation, Transition Cost Lessee, Operating Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, to be Paid, Year Two Basic earnings (loss) per common share: From Continuing Operations Earnings Per Share, Basic [Abstract] Notes payable - floor plan - trade VehicleFloorPlanPayableTrade Net (repayments) borrowings on notes payable - floor plan - non-trade IncreaseDecreaseInVehicleFloorPlanPayableNonTradeNet Net Income (Loss) Earnings Per Share, Basic, Other Disclosure [Abstract] Sidecar Facility Sidecar Facility [Member] Sidecar Facility Long-Lived Asset, Change to Plan of Sale, Reclassification from Held-for-Sale to Held-and-Used, Impairment Loss Long-Lived Asset, Change to Plan of Sale, Reclassification from Held-for-Sale to Held-and-Used, Impairment Loss Provision for income tax benefit (expense) related to components of other comprehensive income (loss) Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent Weighted-average remaining lease term (in years): Finance leases Finance Lease, Weighted Average Remaining Lease Term Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Class B common stock Class B Common Stock Common Class B [Member] Consolidation Items [Domain] Consolidation Items [Domain] Operating Lease, Liability, Current Operating Lease, Liability, Current Debt Instrument, Basis Spread LIBOR Debt Instrument, Basis Spread LIBOR Debt Instrument, Basis Spread specified by 2019 Mortgage Facility Mortgages Mortgages [Member] Per Share Data and Stockholders' Equity Earnings Per Share [Text Block] Earnings Per Share [Abstract] Cost of Sales: Cost of Product and Service Sold [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Trading Symbol Trading Symbol Deferred compensation plan DeferredCompensationPlanLiabilityFairValueDisclosure Purchases of land, property and equipment Payments to Acquire Property, Plant, and Equipment Payments to Acquire Property, Plant, and Equipment Intangible assets - Reductions from impairment powersports Intangible assets - Reductions from impairment powersports Intangible assets - Reductions from impairment powersports Summary of Interest Received and Paid under Term of Cash Flow Swap Schedule of Interest Rate Derivatives [Table Text Block] Non-vested restricted stock Undistributed Discontinued Operation Earnings (Loss), Allocation to Participating Securities, Basic Two Thousand Twenty Vehicle Floor Plan Facility Two Thousand Twenty Vehicle Floor Plan Facility [Member] Two Thousand Twenty Vehicle Floor Plan Facility Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred Company Selected Measure Name Company Selected Measure Name Other Real Estate, Valuation Adjustments Other Real Estate, Valuation Adjustments Intangible Asset, Indefinite-Lived, Divestiture Intangible Asset, Indefinite-Lived, Divestiture Income Tax Disclosure [Abstract] Pay Rate Derivative, Fixed Interest Rate Mortgage notes to finance companies-fixed rate, percentage Long-Term Debt, Percentage Bearing Fixed Interest, Percentage Rate Intangible Asset, Indefinite-Lived [Table] Intangible Asset, Indefinite-Lived [Table] Diluted earnings (loss) per common share: Effect of dilutive securities: Earnings Per Share, Diluted [Abstract] Segment gross profit Segment gross profit Segment gross profit Credit Facility [Domain] Credit Facility [Domain] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction CASH FLOWS FROM OPERATING ACTIVITIES Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Selling, general and administrative expenses Sales Commissions and Fees Intangible Asset, Indefinite-Lived [Line Items] Intangible Asset, Indefinite-Lived [Line Items] Franchise Franchise [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Franchised Dealerships Acquired Franchised Dealerships Acquired Franchised Dealerships Acquired Disposal Group Name [Domain] Disposal Group Name [Domain] Finance Lease, Liability, Payments, Due Year Two Finance Lease, Liability, to be Paid, Year Two Line of Credit Facility [Table] Line of Credit Facility [Table] Leases, Liability, Noncurrent, New Leases Leases, Liability, Noncurrent, New Leases Leases, Liability, Noncurrent, New Leases Dividends Dividends Deferred Income Taxes and Tax Credits Deferred Income Taxes and Tax Credits Finance Lease, Liability, Payments, Due Year Four Finance Lease, Liability, to be Paid, Year Four Net cash proceeds Proceeds from Derivative Instrument, Financing Activities Business Combination, Goodwill, Expected Tax Deductible, Amount Business Combination, Goodwill, Expected Tax Deductible, Amount Revenues and Other Activities Associated with Disposed Dealerships Classified as Discontinued Operations Disposal Groups, Including Discontinued Operations [Table Text Block] 6.125% Notes 6.125% Senior Subordinate Notes due 2027 SixPointOneTwoFivePercentSeniorSubordinateNoteDueTwoThousandTwentySevenMember Current borrowing capacity Line of Credit Facility, Current Borrowing Capacity Gross profit Gross Profit Goodwill - Franchise Segment Goodwill - Franchise Segment Goodwill - Franchise Segment Finance Lease, Liability, Undiscounted Excess Amount Finance Lease, Liability, Undiscounted Excess Amount Operating Lease, Payments Operating Lease, Payments Award Timing Predetermined Award Timing Predetermined [Flag] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] APIC, Share-based Payment Arrangement, Increase for Cost Recognition APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Effective tax rate from continuing operations Effective Income Tax Rate Reconciliation, Percent Powersports Segment Revenue Powersports Segment Revenue Powersports Segment Revenue EchoPark EchoPark Segment PreOwnedStoresMember Finance Lease, Liability, Noncurrent, Amortization Finance Lease, Liability, Noncurrent, Amortization Finance Lease, Liability, Noncurrent, Amortization Stock compensation plans (shares) Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements EchoPark Segment [Member] EchoPark Segment [Member] EchoPark Segment TwoThousandSixteenRevolvingCreditFacilityMember TwoThousandSixteenRevolvingCreditFacilityMember Cash Flow Swap H CashFlowSwapSevenMember Fair Value Long-Term Debt, Fair Value Two Thousand Sixteen Vehicle Floor Plan Facility [Member] Two Thousand Sixteen Vehicle Floor Plan Facility [Member] Two Thousand Sixteen Vehicle Floor Plan Facility Depreciation Depreciation Intangible Assets Preowned Intangible Assets Preowned Intangible Assets Preowned Right-of-use asset Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Stand-alone pre-owned vehicle business Stand Alone Pre Owned Vehicle Business [Member] Stand Alone Pre Owned Vehicle Business Net benefit expected to be reclassified Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Leases, Liability, Current, Amortization Leases, Liability, Current, Amortization Leases, Liability, Current, Amortization Fair Value Disclosures [Abstract] Discrete charge for non-deductible disposition Effective Income Tax Rate Reconciliation, Disposition of Asset, Amount Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Powersports New Vehicles Cost of Sales Powersports New Vehicles Cost of Sales Powersports New Vehicles Cost of Sales 2016 Revolving Credit Facility Long-Term Line of Credit Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Abstract] Number of franchises disposed NumberOfFranchisesDisposed Dividends paid Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Debt Instrument Redemption Debt Instrument Redemption [Table Text Block] Fixed Ops Decline Min Fixed Ops Decline Min Fixed Ops Decline Min Disposal Group, Including Discontinued Operations [Line Items] Disposal Group, Including Discontinued Operations [Line Items] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Lessor, Operating Lease, Payments to be Received, Thereafter Lessor, Operating Lease, Payment to be Received, after Year Five Operating Leases, Future Minimum Payments Receivable, in Two Years (Deprecated 2026) Operating Leases, Future Minimum Payments Receivable, in Two Years (Deprecated 2026) Receivables Increase (Decrease) in Accounts and Other Receivables Powersports Dealerships Powersports Dealerships [Member] Powersports Dealerships JLR 4 Pack [Member] JLR 4 Pack [Member] JLR 4 Pack Finance Lease, Liability, Noncurrent, New Leases Finance Lease, Liability, Noncurrent, New Leases Finance Lease, Liability, Noncurrent, New Leases CASH FLOWS FROM INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Closed Store Accrued Expenses Closed Store Accrued Expenses Closed Store Accrued Expenses FranchisedDealershipsMember FranchisedDealershipsMember [Member] FranchisedDealershipsMember Debt Instrument Percentage Of Outstanding Principal Amount Redeemable Upon Event Of Default Debt Instrument Percentage Of Outstanding Principal Amount Redeemable Upon Event Of Default Percentage of the outstanding principal amount of the entity's debt obligation that holders may accelerate if certain events of default occur. Intangible Assets - Assets Acquired Powersports Intangible Assets - Assets Acquired Powersports Intangible Assets - Assets Acquired Powersports Lessor, Operating Lease, Payments to be Received, Next Twelve Months Lessor, Operating Lease, Payment to be Received, Year One Powersports New Vehicle Revenue Powersports New Vehicle Revenue Powersports New Vehicle Revenue Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Powersports Wholesale Vehicles Cost of Sales Powersports Wholesale Vehicles Cost of Sales Powersports Wholesale Vehicles Cost of Sales 2020 Line of Credit Facility 2020 Line of Credit Facility [Member] 2020 Line of Credit Facility Segments Segments [Domain] Interest rate swap Interest Rate Swap [Member] Parts and service equipment PartsAndServiceEquipmentMember PY Acq GW Allocations Powersports PY Acq GW Allocations Powersports PY Acq GW Allocations Powersports Disposal Group Classification [Domain] Disposal Group Classification [Domain] Debt issuance costs Debt Issuance Costs, Net Building and improvements Building Improvements [Member] Maximum Borrowing 2019 Mortgage Facility Maximum Borrowing 2019 Mortgage Facility Maximum Borrowing 2019 Mortgage Facility Business Combination [Table] Business Combination [Table] Intangible Assets - Reductions from dispositions Total Intangible Assets - Reductions from dispositions Total Intangible Assets - Reductions from dispositions Total PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Cash Flow Swap A CashFlowSwapEightMember Debt Instrument, Redemption, Period Six Debt Instrument, Redemption, Period Six [Domain] Debt Instrument, Redemption, Period Six Weighted-average discount rate: Finance leases Finance Lease, Weighted Average Discount Rate, Percent Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Total Stockholders' Equity Beginning balance Ending balance Equity, Attributable to Parent Operating Leases, Future Minimum Payments Receivable, in Five Years (Deprecated 2026) Operating Leases, Future Minimum Payments Receivable, in Five Years (Deprecated 2026) ASSETS Assets: Assets [Abstract] Powersports Dealerships acquired Powersports Dealerships acquired [Member] Powersports Dealerships acquired Intangible Asset, Including Goodwill, Impairment Loss Intangible Asset, Including Goodwill, Impairment Loss Fair Value, Nonrecurring [Member] Fair Value, Nonrecurring [Member] Insider Trading Policies and Procedures [Line Items] Basic earnings (loss) NetIncomeLossBasicAfterEffectOfParticipatingSecurities Goodwill, Measurement Period Adjustment Goodwill, Measurement Period Adjustment Capital expenditures Property, Plant, and Equipment, before Accumulated Depreciation, Addition Deferred income taxes Deferred Income Tax Expense (Benefit) Unusual Risks and Uncertainties Unusual Risks and Uncertainties [Table Text Block] Number of operating segments Number of Operating Segments Entity Central Index Key Entity Central Index Key Lease Liability Noncurrent New Lease Total Lease Liability Noncurrent New Lease Total Lease Liability Noncurrent New Lease Total Less accumulated depreciation Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Paid-in capital Additional Paid in Capital, Common Stock Equity [Abstract] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Intangible assets - Reductions from impairment preowned Intangible assets - Reductions from impairment preowned Intangible assets - Reductions from impairment preowned Payments for Legal Settlements Payments for Legal Settlements FloorPlanDepositBalance FloorPlanDepositBalance FloorPlanDepositBalance Lease, Liability, Current, New Leases Lease, Liability, Current, New Leases Lease, Liability, Current, New Leases Fair Value, Hierarchy Fair Value Hierarchy and NAV [Axis] Powersports Fixed Ops Cost of Sales Powersports Fixed Ops Cost of Sales Powersports Fixed Ops Cost of Sales Investment, Name Investment, Name [Axis] Derivative instruments and hedging activities Designated as Hedging Instrument [Member] 2019 Finance Leases, Future Minimum Payments Due, Next Twelve Months Finance Leases, Future Minimum Payments Due, Next Twelve Months Finance Lease, Liability, Noncurrent Finance Lease, Liability, Noncurrent Debt Instrument, Basis Spread on Variable Rate Debt Instrument, Basis Spread on Variable Rate Business Combination, Recognized Asset Acquired, Other Asset, Current Business Combination, Recognized Asset Acquired, Other Asset, Current Variable Rate [Domain] Variable Rate [Domain] Period One Debt Instrument, Redemption, Period One [Member] Finance Lease, Liability, Payment, Due Total Finance Lease, Liability, to be Paid Accumulated Other Comprehensive Income (Loss) Total Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Real Estate, Fair Value Real Estate, Fair Value Real Estate, Fair Value Financial Covenants Include Required Specified Ratios DebtInstrumentCovenantTableTextBlock Used Unit Sale Decline Used Unit Sale Decline Used Unit Sale Decline Previously reported Previously Reported [Member] General indemnifications maximum expiration period GeneralIndemnificationsMaximumExpirationPeriod Statement [Line Items] Statement [Line Items] Total Assets Assets Assets Lessee, Operating Lease, Liability, Payment, Due [Abstract] Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Business Combination [Abstract] Capital lease obligations Lease Obligation Incurred Operating segments Operating Segments [Member] Total revenues Disposal Group, Including Discontinued Operation, Revenue Business Combination, Recognized Liability Assumed, Liability Business Combination, Recognized Liability Assumed, Liability Other comprehensive income (loss) before reclassifications OCI, before Reclassifications, Net of Tax, Attributable to Parent PEO PEO [Member] Beginning balance (shares) Ending balance (shares) Shares, Outstanding Other Long-Term Liabilities Other Liabilities, Noncurrent Goodwill Goodwill Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Thereafter Finance Lease, Liability, to be Paid, after Year Five Franchised Fixed Ops Cost of Sales Franchised Fixed Ops Cost of Sales Franchised Fixed Ops Cost of Sales Tax expense for uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Amount Land and Land Improvements Land and Land Improvements [Member] Borrowing base RevolvingBorrowingBase Retained Earnings Retained Earnings [Member] Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent Revolving Credit Facility Revolving Credit Facility [Member] Impairment loss Operating Lease, Impairment Loss Operating Lease, Right-of-Use Asset, Modifications Operating Lease, Right-of-Use Asset, Modifications Operating Lease, Right-of-Use Asset, Modifications Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] NumberOfPowerSportsTerminated NumberOfPowerSportsTerminated Fair Value and Carrying Value of Significant Fixed Rate Long-Term Debt Fair Value, by Balance Sheet Grouping [Table Text Block] New Vehicle Floorplan Facility (Commitments) New Vehicle Floorplan Facility (Commitments) [Member] New Vehicle Floorplan Facility (Commitments) Earnings (loss) per common share (usd per share) Earnings Per Share, Diluted Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount Intangible Asset, Finite-Lived [Line Items] Intangible Asset, Finite-Lived [Line Items] Number of franchises terminated NumberOfFranchisesTerminated Borrowings on revolving credit facilities Proceeds from Long-Term Lines of Credit Lease Contractual Term [Domain] Lease Contractual Term [Domain] Business Combination, Recognized Asset Acquired, Asset Business Combination, Recognized Asset Acquired, Asset Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect of Transition [Domain] Initial Application Period Cumulative Effect of Transition Amounts reclassified out of accumulated other comprehensive income (loss), tax expense Reclassification from AOCI, Current Period, Tax Goodwill - Powersports Segment Goodwill - Powersports Segment Goodwill - Powersports Segment Business Combination, Pro Forma Information, Nonrecurring Adjustment [Domain] Business Combination, Pro Forma Information, Nonrecurring Adjustment [Domain] Revenues Total consolidated revenues Revenue from Contract with Customer, Excluding Assessed Tax Lease agreements Lease Agreements [Member] Borrowing availability amount Line of Credit Facility, Remaining Borrowing Capacity Business Acquisition, Pro Forma Earnings Business Acquisition, Pro Forma Earnings Business Acquisition, Pro Forma Earnings Discontinued operations: Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Chief operating decision maker group OperatingDecisionMakerGroupNumberofMembers Total revenues PartsServiceandCollisionRepairandFinanceInsuranceandOtherNetSubtotalMember Contract Termination Contract Termination [Member] Goodwill, Purchase Accounting Adjustment Goodwill, Purchase Accounting Adjustment Goodwill, Purchase Accounting Adjustment Repurchase of debt securities RepurchaseOfDebtSecurities Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Number of Franchised stores with GW Adjustment Number of Franchised stores with GW Adjustment [Abstract] Number of Franchised stores with GW Adjustment Cumulative Effect of Adjustments for Adoption of Topic 842 Accounting Standards Update and Change in Accounting Principle [Table Text Block] Intangible Assets - reduction from dispositions preowned Intangible Assets - reduction from dispositions preowned Intangible Assets - reduction from dispositions preowned Subsegments [Domain] Subsegments [Domain] Construction in progress Construction in Progress [Member] New vehicles TotalNewVehicleMember Equity Method Investment [Table] Equity Method Investment [Table] EchoPark Segment [Domain] EchoPark Segment [Domain] EchoPark Segment [Domain] Operating income (loss) Operating income (loss) Segment income (loss) Operating Income (Loss) Cash Flow Swap F CashFlowSwapFiveMember Period Four Debt Instrument, Redemption, Period Four [Member] Treasury stock, shares Treasury Stock, Shares (Deprecated 2023) Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. Intangible Asset, Impairment, Description Intangible Asset, Impairment, Description Finance Lease, Liability, Maturity Finance Lease, Liability, to be Paid, Maturity [Table Text Block] Business Acquisitions and Dispositions Business Combination [Text Block] Company vehicles Vehicles [Member] Segments [Axis] Business Segments [Axis] Business Segments New Unit Sale Decline New Unit Sale Decline New Unit Sale Decline Intangible Assets - Reductions from dispositions powersports Intangible Assets - Reductions from dispositions powersports Intangible Assets - Reductions from dispositions powersports Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Deferred Tax Liabilities, Goodwill Deferred Tax Liabilities, Goodwill Asset impairment charges Asset impairment charges Impairment charges Impairment charges Asset, Impairment Loss Common stock, shares issued Common Stock, Shares, Issued 2022 Finance Leases, Future Minimum Payments Due, Due In Four Years Finance Leases, Future Minimum Payments Due, Due In Four Years Pending Acquisition [Text Block] Pending Acquisition [Text Block] Pending Acquisition Disposed dealerships classified as discontinued operations Discontinued Operations [Member] Intangible Assets - Assets Acquired Preowned Intangible Assets - Assets Acquired Preowned Intangible Assets - Assets Acquired Preowned Effects of Adoption of ASC 606 Revision of Prior Period, Adjustment [Member] Lease, Liability Noncurrent, Modifications Total Lease, Liability Noncurrent, Modifications Total Lease, Liability Noncurrent, Modifications Total Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Product and Service [Domain] Product and Service [Domain] Franchisor Disclosure [Axis] Franchisor Disclosure [Axis] Number of Stores Number of Stores Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual Business Combination, Acquiree's Earnings (Loss) since Acquisition Date, Actual Deferred Income Taxes Deferred income taxes Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Tax effect on fair value of interest rate swap and rate cap agreements Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent (Deprecated 2025) Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory Subsequent Events [Abstract] 2020 Line of Credit Text Block [Text Block] 2020 Line of Credit Text Block [Text Block] 2020 Line of Credit Text Block Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Unit Sale Decline Min Unit Sale Decline Min Unit Sale Decline Min Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] 2020 Finance Leases, Future Minimum Payments Due, Due In Two Years Finance Leases, Future Minimum Payments Due, Due In Two Years Other accrued liabilities Other Liabilities, Current Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Amount reserved for pending proceedings LegalMattersAmountReservedForPendingProceedings Fair Value as of Grant Date Award Grant Date Fair Value Mortgage notes to finance companies - variable rate, bearing interest at 1.50 to 2.90 percentage points above one-month or three-month LIBOR Long-Term Debt, Percentage Bearing Variable Interest, Amount Debt Instrument, Redemption Price, Percentage Debt Instrument, Redemption Price, Percentage Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Share Repurchase Program, Remaining Authorized, Amount Share Repurchase Program, Remaining Authorized, Amount Mid-line import franchise Mid Line Import Franchise [Member] Mid Line Import Franchise Arrangement Duration Trading Arrangement Duration Significant Changes, Franchised Outlets in Operation Significant Changes, Franchised Outlets in Operation Consolidation Items [Axis] Consolidation Items [Axis] Leases, right-of-use asset Leases, Right-of-Use Asset Leases, Right-of-Use Asset Leases, Right-of-Use Asset Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Franchised Fleet New Vehicles Cost of Sales Franchised Fleet New Vehicles Cost of Sales Franchised Fleet New Vehicles Cost of Sales Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Interest expense, other, net Interest Expense, Other Interest Expense, Other Franchise Assets - reductions from disp fdealer Franchise Assets - reductions from disp fdealer Franchise Assets - reductions from disp fdealer Number of operating locations related to mortgage financing NumberOfOperatingLocationsRelatedToMortgageFinancing Finance Lease, Liability, Current, New Leases Finance Lease, Liability, Current, New Leases Finance Lease, Liability, Current, New Leases NewVehiclesMember NewVehicles [Member] NewVehicles 4.875% Notes 4.875% Notes Domain 4.875% Notes Domain Trade accounts payable and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Debt instrument, redemption, option to redeem [Member] Debt instrument, redemption, option to redeem [Member] Debt instrument, redemption, option to redeem Operating Lease, Liability, Current, Modifications Operating Lease, Liability, Current, Modifications Operating Lease, Liability, Current, Modifications Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount 2023 Operating Leases, Future Minimum Payments, Due in Five Years (Deprecated 2026) Finance Lease, Right-of-Use Asset, Amortization Finance Lease, Right-of-Use Asset, Amortization Finance Lease, Right-of-Use Asset, Amortization 4.625 % Notes 4.625 % Notes Domain Intangible Asset, Finite-Lived, Class Intangible Asset, Finite-Lived, Class [Domain] Assets and Liabilities Recorded at Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Finance Lease, Interest Expense Finance Lease, Interest Expense Fair Value Measurements Fair Value Disclosures [Text Block] Powersports Used Vehicles Cost of Sales Powersports Used Vehicles Cost of Sales Powersports Used Vehicles Cost of Sales Cash Flow Swap G CashFlowSwapSixMember Covenants Text Block [Text Block] Covenants Text Block [Text Block] Covenants Text Block Redemption percentage of principal amount Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Operating Leases, Future Minimum Payments Receivable, in Four Years (Deprecated 2026) Operating Leases, Future Minimum Payments Receivable, in Four Years (Deprecated 2026) Purchases of treasury stock (shares) Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Income (loss) from discontinued operations before taxes Pre-tax income (loss) Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Service Loaner Inventory (Directly Leased from Manufacturer) Service Loaner Inventory (Directly Leased from Manufacturer) Service Loaner Inventory (Directly Leased from Manufacturer) Lessor, Operating Lease, Payments to be Received Lessor, Operating Lease, Payment to be Received Other Assets Other Assets Goodwill and Indefinite -Lived Assets, Written off related to sale of business unit Goodwill and Indefinite -Lived Assets, Written off related to sale of business unit Goodwill and Indefinite -Lived Assets, Written off related to sale of business unit Change in fair value of interest rate swap and interest rate cap agreements (net of tax expense of $1,563 and $1,099 in the nine months ended September 30, 2018 and 2017, respectively) Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax (Deprecated 2025) Double-carry interest Interest Expense, Debt Liability Class [Axis] Liability Class [Axis] Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Repurchase amount paid in cash, plus accrued and unpaid interest related thereto Early Repayment of Subordinated Debt Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Rent expense, SG&A Rent expense, SG&A Rent expense, SG&A Provision for bad debt expense ProvisionRecoveryForDoubtfulAccounts Non-NEOs Non-NEOs [Member] Percent of Collateralized Real Estate Percent of Collateralized Real Estate Max borrowings under 2019 Mortgage Facility is based on a percentage of the value of certain real estate assets used as collateral Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment, Land Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment, Land Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Percentage of dealership that is accounted for under the equity method Equity Method Investment, Ownership Percentage Finance Leases, Future Minimum Payments Due, Total Finance Leases, Future Minimum Payments Due, Total Finance Leases, Future Minimum Payments Due, Total Investment, Name Investment, Name [Domain] Components of Inventories Schedule of Inventory, Current [Table Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Purchases of treasury stock Payments for Repurchase of Common Stock Range [Axis] Statistical Measurement [Axis] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Maximum Borrowing 2020 Line of Credit Facility Maximum Borrowing 2020 Line of Credit Facility Maximum Borrowing 2020 Line of Credit Facility Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Segment income (loss): Segment Reporting, Operating Income (Loss) [Abstract] Operating Lease, Cost Operating Lease, Cost 2024 Operating Leases, Future Minimum Payments, Due Thereafter (Deprecated 2026) ASU 2016-02 Accounting Standards Update 2016-02 [Member] (Deprecated 2026) Lease Right of Use Asset New Lease Total Lease Right of Use Asset New Lease Total Lease Right of Use Asset New Lease Total Used vehicles UsedVehiclesMember Derivative Contract [Domain] Derivative Contract [Domain] Impaired Assets to be Disposed of by Method Other than Sale, Asset Name [Domain] Impaired Assets to be Disposed of by Method Other than Sale, Asset Name [Domain] Type of Adoption [Domain] Accounting Standards Update [Domain] Number of acquired franchises Business Combination, Number of Businesses Acquired Total Liabilities and Stockholders' Equity Liabilities and Equity Variable Lease, Cost Variable Lease, Cost Employee Stock Option Share-Based Payment Arrangement, Option [Member] Segments Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Leases of Lessee Disclosure [Text Block] (Deprecated 2026) Leases of Lessee Disclosure [Text Block] (Deprecated 2026) Tabular List, Table Tabular List [Table Text Block] Retail Units Retail Units Retail Units Notes Payable to Banks Notes Payable to Banks [Member] Business Acquisition, Earnings Reported by Acquired Entity for Last Annual Period Business Acquisition, Earnings Reported by Acquired Entity for Last Annual Period Business Acquisition, Earnings Reported by Acquired Entity for Last Annual Period Subsequent Class A Common Stock Repurchase Ave Price Subsequent Class A Common Stock Repurchase Ave Price Subsequent Class A Common Stock Repurchase Ave Price Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Franchised Awarded Franchised Awarded Franchised Awarded Right of Use Assets Total Right of Use Assets Total Right of Use Assets Total Property, Plant and Equipment Property, Plant and Equipment [Member] Property, Plant and Equipment, Type Long-Lived Asset, Class [Domain] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Goodwill and Intangible Assets Acquired Fdealer Goodwill and Intangible Assets Acquired Fdealer Goodwill and Intangible Assets Acquired Fdealer Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments Due, Next 12 Months (Deprecated 2026) Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Class A convertible preferred stock, none issued Preferred Stock, Value, Issued GW Asset Impairment Powersports GW Asset Impairment Powersports GW Asset Impairment Powersports Lease, Liability, Current, Amortization Total Lease, Liability, Current, Amortization Total Lease, Liability, Current, Amortization Total Adjustment to Compensation: Adjustment to Compensation [Axis] Goodwill - Preowned Segment Goodwill - Preowned Segment Goodwill - Preowned Segment 2016 Credit Facilities TwoThousandSixteenCreditFacilityMember Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash flow swaps and interest rate caps designated as hedges Interest Rate Cash Flow Hedge Liability at Fair Value Hedging Designation [Axis] Hedging Designation [Axis] Credit Facility [Axis] Credit Facility [Axis] Gain (loss) on acquisitions and disposals [Member] Gain (loss) on acquisitions and disposals [Member] Gain (loss) on acquisitions and disposals Total assets Assets, Fair Value Disclosure Line of Credit Facility, Increase (Decrease), Net Line of Credit Facility, Increase (Decrease), Net Finance Lease, Liability, Payments, Due Year Five Finance Lease, Liability, to be Paid, Year Five Term Loan, Principal Amount Term Loan, Principal Amount Term Loan, Principal Amount Name Measure Name Unit Sale Decline Max Unit Sale Decline Max Unit Sale Decline Max Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Goodwill Adjustment [Axis] Goodwill Adjustment [Axis] Goodwill Adjustment Paid-In Capital Additional Paid-in Capital [Member] Indefinite-lived Intangible Assets Intangible Asset, Indefinite-Lived, Class [Axis] Goodwill, Impairment Loss Goodwill, Impairment Loss Income (Loss) From Continuing Operations, Diluted earnings (loss) IncomeLossFromContinuingOperationsDiluted Lessor, Operating Lease, Payments to be Received, Five Years Lessor, Operating Lease, Payment to be Received, Year Five Name Trading Arrangement, Individual Name Cash and cash equivalents CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR CASH AND CASH EQUIVALENTS, END OF PERIOD Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization Executive transition costs Executive Transition Costs Executive Transition Costs Shares awarded under stock compensation plan (shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Minimum EBTDAR to rent ratio MinimumEBTDARToRentRatio Right-of-use assets obtained in exchange for new lease liabilities: Finance leases Right-of-use assets obtained in exchange for new lease liabilities: Finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Weighted-average remaining lease term (in years): Operating leases Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue Initial Application Period Cumulative Effect of Transition [Table] Revenue Initial Application Period Cumulative Effect Transition EchoPark Delivery/Buy Centers [Abstract] EchoPark Delivery/Buy Centers [Abstract] EchoPark Delivery/Buy Centers Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities Income (loss) from operations DisposalGroupNotDiscontinuedOperationOperatingIncomeLoss Cost of Sales Cost of Sales Cost of Product and Service Sold Award Timing Method Award Timing Method [Text Block] Franchised New Vehicles Cost of Sales Franchised New Vehicles Cost of Sales Franchised New Vehicles Cost of Sales NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Mortgage notes MortgageNotesPayableMember GW Amm Amort Preowned GW Amm Amort Preowned GW Amm Amort Preowned Notional Amount Derivative Liability, Notional Amount Lessor, Operating Lease, Payments to be Received, Two Years Lessor, Operating Lease, Payment to be Received, Year Two Net income (loss) Net income (loss) Earnings (loss) Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] 2016 Credit Facilities [Text Block] 2016 Credit Facilities [Text Block] 2016 Credit Facilities Location, Statement of Financial Position, Balance [Axis] Location, Statement of Financial Position, Balance [Axis] Bridge Loan Bridge Loan [Member] Operating Lease, Right-of-Use Asset, Amortization Operating Lease, Right-of-Use Asset, Amortization Operating Lease, Right-of-Use Asset, Amortization Proceeds from sales of property and equipment Proceeds from Sale of Property, Plant, and Equipment Income (loss) from discontinued operations Earnings (loss) Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Operating Lease, Liability, Current, New Leases Operating Lease, Liability, Current, New Leases Operating Lease, Liability, Current, New Leases Restatement Determination Date: Restatement Determination Date [Axis] Summary of Changes in Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Number of franchises ceased operations NumberOfFranchisesCeasedOperations Operating Lease, Liability, Noncurrent, Amortization Operating Lease, Liability, Noncurrent, Amortization Operating Lease, Liability, Noncurrent, Amortization Income (loss) from continuing operations Earnings (loss) Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Powersports Fixed Ops Revenue Powersports Fixed Ops Revenue Powersports Fixed Ops Revenue Leases, Right-of-Use Asset, New Leases Leases, Right-of-Use Asset, New Leases Leases, Right-of-Use Asset, New Leases Domestic Franchised Dealership [Abstract] Domestic Franchised Dealership [Abstract] Domestic Franchised Dealership Revenues: Revenues: Revenues [Abstract] Operating Leases, Future Minimum Payments Receivable (Deprecated 2026) Operating Leases, Future Minimum Payments Receivable (Deprecated 2026) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Intangible Asset and Goodwill Intangible Asset and Goodwill [Table Text Block] Lease Expense [Abstract] Lease Expense [Abstract] Lease Expense Asset Acquisition [Table] Asset Acquisition [Table] Range [Domain] Statistical Measurement [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Business Combination, Acquisition-Related Cost, Expense Business Combination, Acquisition-Related Cost, Expense 2023 Finance Leases, Future Minimum Payments Due, Due In Five Years Finance Leases, Future Minimum Payments Due, Due In Five Years Lease exit accrual adjustments and charges DiscontinuedOperationLeaseExitAccrualAdjustmentsAndCharges Common stock, value Common Stock, Value, Issued Lease exit costs accrual LeaseExitAccruals Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months Lessee, Operating Lease, Liability, to be Paid, Year One Debt Instrument Maximum Allowed Dividends Per Share Debt Instrument Maximum Allowed Dividends Per Share Maximum amount per share the entity may pay as quarterly cash dividends on common stock as permitted by the indenture governing the entity's debt obligation. Luxury Dealership [Domain] Luxury Dealership [Member] Luxury Dealership [Member] Long-Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Goodwill and Intangible Assets Acquired Powersports Goodwill and Intangible Assets Acquired Powersports Goodwill and Intangible Assets Acquired Powersports Line of Credit [Member] Line of Credit [Member] Restatement Determination Date Restatement Determination Date 2022 Operating Leases, Future Minimum Payments, Due in Four Years (Deprecated 2026) Operating Leases, Future Minimum Payments Receivable, in Three Years (Deprecated 2026) Operating Leases, Future Minimum Payments Receivable, in Three Years (Deprecated 2026) Pending acquisition [Domain] Pending acquisition [Domain] Pending acquisition Other Payments to Acquire Businesses Other Payments to Acquire Businesses 4.625 Notes Text [Text Block] 4.625 Notes Text [Text Block] 4.625 Notes Text Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Current Liabilities: Liabilities, Current [Abstract] Operating Lease, Liability, Noncurrent, Modifications Operating Lease, Liability, Noncurrent, Modifications Operating Lease, Liability, Noncurrent, Modifications Inventory [Axis] Inventory [Axis] Finance Lease, Principal Payments Finance Lease, Principal Payments TwoThousandTwentyRevolvingCreditFacilityMember TwoThousandTwentyRevolvingCreditFacilityMember [Member] TwoThousandTwentyRevolvingCreditFacilityMember Net income and retained earnings free of restrictions DebtInstrumentCovenantComplianceUnrestrictedNetIncomeLossAndRetainedEarnings Disposal Group Classification [Axis] Disposal Group Classification [Axis] Derivative Cash Premium Paid Derivative Cash Premium Paid Derivative Cash Premium Paid Interest, including amount capitalized Interest Paid, Including Capitalized Interest, Operating and Investing Activities Prior Term Loan, Principal Amount Prior Term Loan, Principal Amount Prior Term Loan, Principal Amount Finance Lease, Right-of-Use Asset, Modifications Finance Lease, Right-of-Use Asset, Modifications Finance Lease, Right-of-Use Asset, Modifications RFJ RFJ [Member] RFJ Business Combination, Pro Forma Information, Nonrecurring Adjustment [Axis] Business Combination, Pro Forma Information, Nonrecurring Adjustment [Axis] PY Acq GW Allocations PY Acq GW Allocations PY Acq GW Allocations Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Lease Right of Use Asset Amortization Total Lease Right of Use Asset Amortization Total Lease Right of Use Asset Amortization Total Property, Plant, and Equipment [Abstract] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Assets: Assets, Fair Value Disclosure [Abstract] EchoPark Stores [Abstract] EchoPark Stores [Abstract] EchoPark Stores 2016 New Vehicle Floor Plan Facility and 2016 Used Vehicle Floor Plan Facility A2016NewVehicleFloorPlanFacilityand2016UsedVehicleFloorPlanFacilityMember Intangible Assets - Reductions from Dispositions Franchised Intangible Assets - Reductions from Dispositions Franchised Intangible Assets - Reductions from Dispositions Franchised Derivative, Notional Amount Derivative, Notional Amount Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Weighted average common shares outstanding Weighted Average Number of Shares Outstanding, Basic Non-vested restricted stock Undistributed Continuing Operation Earnings (Loss), Allocation to Participating Securities, Basic Contract assets Contract with Customer, Asset, after Allowance for Credit Loss, Current Net of accumulated impairment losses Goodwill, Impaired, Accumulated Impairment Loss Mortgage financing aggregate Secured Debt 2020 Operating Leases, Future Minimum Payments, Due in Two Years (Deprecated 2026) Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Used vehicles InventoryUsedVehicles Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, to be Paid, Year Four 2019 Mortgage Facility Outstanding 2019 Mortgage Facility Outstanding 2019 Mortgage Facility Outstanding Mortgage Notes Text Block [Text Block] Mortgage Notes Text Block [Text Block] Mortgage Notes Text Block Loss on disposal of business Loss on disposal of business Loss on disposal of business Thereafter Finance Leases, Future Minimum Payments Due, Thereafter Finance Leases, Future Minimum Payments Due, Thereafter Intangible Assets - Powersports Intangible Assets - Powersports Intangible Assets - Powersports Finance Lease, ST Lease Liabilities ASC 840 Finance Lease, ST Lease Liabilities ASC 840 Finance Lease, ST Lease Liabilities ASC 840 Document Information [Line Items] Document Information [Line Items] Other Nonrecurring Gain Other Nonrecurring Gain Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Class of Stock Class of Stock [Axis] Debt Instrument Redemption [Table] Debt Instrument Redemption [Table] Remaining Availability 2020 LOC Remaining Availability 2020 LOC Remaining Availability 2020 LOC Receivable [Domain] Receivable [Domain] Sublease Income Sublease Income Intangible Asset, Indefinite-Lived, Acquired Intangible Asset, Indefinite-Lived, Acquired Interest Rate Cap 6-9 Interest Rate Cap 6-9 [Member] Interest Rate Cap 6-9 Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Current maturities of long-term debt Less current maturities Long-Term Debt, Current Maturities Cash Flow Swap B CashFlowSwapOneMember PY Acq GW Allocations Fdealer PY Acq GW Allocations Fdealer PY Acq GW Allocations Fdealer Document And Entity Information [Abstract] Document And Entity Information [Abstract] Wholesale vehicles WholesaleVehiclesMember Treasury stock, at cost; 33,476,159 Class A common stock shares held at September 30, 2018 and 32,290,493 Class A common stock shares held at December 31, 2017 Treasury Stock, Value Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New vehicles InventoryNewVehicles Land Land [Member] number of powersport stores with GW Adjustment number of powersport stores with GW Adjustment [Abstract] number of powersport stores with GW Adjustment Debt issuance cost amortization Amortization of Debt Issuance Costs Subtotal PropertyPlantAndEquipmentBeforeReclassificationOfAssetsHeldToSale Long-Term Debt, Term Bridge Loan Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Total debt Carrying Value Long-Term Debt Property and Equipment Property, Plant, and Equipment [Text Block] Changes in assets and liabilities that relate to operations: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Retail New Vehcile Retail New Vehcile [Member] Retail New Vehcile Net cash provided by (used in) investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Compensation Expense, Excluding Cost of Good and Service Sold Compensation Expense, Excluding Cost of Good and Service Sold EchoPark Used Vehicles Cost of Sales EchoPark Used Vehicles Cost of Sales EchoPark Used Vehicles Cost of Sales Security Exchange Name Security Exchange Name Retail New Vehicles [Member] Retail New Vehicles [Member] Retail New Vehicles Finance Lease, ROU Asset Amortization Finance Lease, ROU Asset Amortization Finance Lease, ROU Asset Amortization Total liabilities Liabilities, Fair Value Disclosure Accrued interest Interest Payable, Current Interest rate swap and interest rate cap InterestRateSwapAndInterestRateCapMember 2019 Mortgage Facility Text Block [Text Block] 2019 Mortgage Facility Text Block [Text Block] 2019 Mortgage Facility Text Block Components of Property and Equipment, Net Property, Plant, and Equipment [Table Text Block] Finance Lease, Right-of-Use Asset, after Accumulated Amortization Finance Lease, Right-of-Use Asset, after Accumulated Amortization Finance Lease, Right-of-Use Asset, after Accumulated Amortization Statement of Comprehensive Income [Abstract] Name Outstanding Recovery, Individual Name Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Impairment of Intangible Assets Impairment of Intangible Assets Impairment of Intangible Assets Finance Lease, Liability, Noncurrent, Modifications Finance Lease, Liability, Noncurrent, Modifications Finance Lease, Liability, Noncurrent, Modifications Less assets held for sale Asset, Held-for-Sale, Not Part of Disposal Group, Current Franchise assets Intangible Asset, Excluding Goodwill, Indefinite-Lived Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Fixed Ops Decline Fixed Ops Decline Fixed Ops Decline Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Subsequent Class A Common Stock Repurchase Subsequent Class A Common Stock Repurchase Subsequent Class A Common Stock Repurchase Amounts reclassified out of accumulated other comprehensive income (loss) Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Insurance Settlement [Member] Insurance Settlement [Member] Proceeds from sales of dealerships Proceeds from Divestiture of Businesses, Net of Cash Divested Defined Benefit Pension Plan Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Subtotal Debt outstanding Long-Term Debt, Gross Leases, Right-of-Use Asset, Amortization Leases, Right-of-Use Asset, Amortization Leases, Right-of-Use Asset, Amortization Business Combination, Acquiree's Revenue, Prior Period Business Combination, Acquiree's Revenue, Prior Period Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Weighted average common shares outstanding Diluted earnings (loss) (shares) Weighted Average Number of Shares Outstanding, Diluted Powersports Segment Powersports Segment [Member] Powersports Segment Entity Emerging Growth Company Entity Emerging Growth Company Loss (gain) on disposal of dealerships and property and equipment LossGainOnDisposalOfFranchisesAndPropertyAndEquipment Underlying Security Market Price Change Underlying Security Market Price Change, Percent Income Tax Benefit Goodwill Impairment Income Tax Benefit Goodwill Impairment Income Tax Benefit Goodwill Impairment SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: Additional Cash Flow Elements [Abstract] Less: Present value discount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Operating Leases, Future Minimum Payments Receivable, Thereafter (Deprecated 2026) Operating Leases, Future Minimum Payments Receivable, Thereafter (Deprecated 2026) Derivative liability, fair value of interest rate swap and cap positions Derivative Liability, Subject to Master Netting Arrangement, before Offset Parts, accessories and other Inventory, Parts and Components, Net of Reserves Revolving Loan, Aggregate Principal Revolving Loan, Aggregate Principal Revolving Loan, Aggregate Principal Impairment of Long-Lived Assets Held-for-use Long-Lived Asset, Held and Used, Impairment Loss Cost of Sales: Cost of Revenue [Abstract] Error Correction Error Correction [Text Block] Discrete charge related to non-deductible asset impairment charge Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount Treasury Stock, Common Treasury Stock, Common [Member] Intangible Asset, Goodwill and Other [Abstract] Letters of credit outstanding amount Letters of Credit Outstanding, Amount Severance Costs Severance Costs Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss), OCI Indefinite-lived Intangible Assets, Major Class Name Intangible Asset, Indefinite-Lived, Class [Domain] Total Lessee, Operating Lease, Liability, to be Paid All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Repayments on revolving credit facilities Repayments of Long-Term Lines of Credit Treasury Stock Treasury Stock [Member] (Deprecated 2023) Shares of an entity that have been repurchased by the entity. This stock has no voting rights and receives no dividends. Note that treasury stock may be recorded at its total cost or separately as par (or stated) value and additional paid in capital. Classified within stockholders' equity if nonredeemable or redeemable solely at the option of the issuer. Classified within temporary equity if redemption is outside the control of the issuer. Tangible Asset Impairment Charges Tangible Asset Impairment Charges Earnout accrual recorded in other long-term liabilities Loss Contingency, Accrual, Noncurrent Dilutive Effect on Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Segment Information Segment Reporting [Text Block] Minimum Minimum [Member] Luxury franchise LuxuryFranchiseMember Operating Leases, Future Minimum Payments Receivable, Current (Deprecated 2026) Operating Leases, Future Minimum Payments Receivable, Current (Deprecated 2026) Liabilities: Liabilities [Abstract] Weighted Average Shares Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Maximum dividend (usd per share) DividendRestrictionMaximumAmountPerShare Location, Statement of Income, Balance [Axis] Location, Statement of Income, Balance [Axis] Earnings (loss) per share from continuing operations (usd per share) Income (Loss) from Continuing Operations, Per Diluted Share Earnings (loss) per share from continuing operations (usd per share) Basic earnings (loss) per share (usd per share) Income (Loss) from Continuing Operations, Per Basic Share Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Period Increase (Decrease) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Period Increase (Decrease) Business Combination [Line Items] Business Combination [Line Items] Dividends, Common Stock Dividends, Common Stock Furniture, fixtures and equipment SoftwareAndComputerEquipmentMember Common stock, shares authorized Common Stock, Shares Authorized Long Term Debt Prepayment Long Term Debt Prepayment Long Term Debt Prepayment Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Loss (gain) on exit of leased dealerships GainLossOnExitOfLeasedDealerships GainLossOnExitOfLeasedDealerships 2021 Finance Leases, Future Minimum Payments Due, Due In Three Years Finance Leases, Future Minimum Payments Due, Due In Three Years Finance, insurance and other, net FinanceInsuranceAndOtherNetMember Exercise Price Award Exercise Price Minimum Consolidated Fixed Charge Coverage Ratio MinimumConsolidatedFixedChargeCoverageRatio Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Share Repurchase Program, Authorized, Amount Share Repurchase Program, Authorized, Amount Segment Reporting [Line Items] Segment Reporting [Line Items] Contract with Customer, Asset, Allowance for Credit Loss, Noncurrent Contract with Customer, Asset, Allowance for Credit Loss, Noncurrent Document Quarterly Report Document Quarterly Report Cash surrender value of life insurance policies Cash Surrender Value, Fair Value Disclosure Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Other Other Other Lender Name [Axis] Lender Name [Axis] Notes payable - floor plan - trade IncreaseDecreaseInVehicleFloorPlanPayableTradeNet GW Accm Amort Fdealer GW Accm Amort Fdealer GW Accm Amort Fdealer Principal payments and repurchase of long-term debt Repayments of Long-Term Debt Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Notes Redemption Price Percentage Of Par Value Due To Change Of Control Notes Redemption Price Percentage Of Par Value Due To Change Of Control The aggregate amount to be paid by the entity upon a "change of control" as defined in the indenture, expressed as a percentage of the par value of the debt obligation. Delayed Draw-Term Loan, Aggregate Principal Delayed Draw-Term Loan, Aggregate Principal Delayed Draw-Term Loan, Aggregate Principal Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Franchise Assets - Franchised Franchise Assets - Franchised Franchise Assets - Franchised Restricted stock amortization RestrictedStockAmortizationNetOfForfeitures Equity Component Equity Component [Domain] Adoption Date Trading Arrangement Adoption Date Franchised [Member] Franchised [Domain] Franchised Total other income (expense) Nonoperating Income (Expense) 2019 Finance Lease Principal Payments YTD 2019 Finance Lease Principal Payments YTD 2019 Finance Lease Principal Payments YTD Notes payable - floor plan - non-trade VehicleFloorPlanPayableNonTrade Initial Borrowing Revolving Facility 2021 Initial Borrowing Revolving Facility 2021 Initial Borrowing Revolving Facility 2021 Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Accounting Policies [Abstract] Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Lease liabilities Operating Lease, Liability Finance Lease, Liability Finance Lease, Liability Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Maximum aggregate earnout payment MaximumAggregateEarnOutPayment Share Repurchase Program, Authorized, Number of Shares Share Repurchase Program, Authorized, Number of Shares Cash flow swaps and interest rate caps designated as hedges Interest Rate Cash Flow Hedge Asset at Fair Value Selling, general and administrative expenses Selling, General and Administrative Expense 2019 Finance Lease Principal Payments 2019 Finance Lease Principal Payments 2019 Finance Lease Principal Payments Repayments of Debt Repayments of Debt Outstanding 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