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Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended |  |  |  |
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Dec. 31, 2021 USD ($) brand store country segment state | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2021 USD ($) | Apr. 29, 2021 finance_company financialInstitution | Sep. 30, 2020 USD ($) | Jul. 14, 2020 finance_company
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |  |
Number of stores | store | 278 |  |  |  |  |  |
Number of new vehicle brands | brand | 40 |  |  |  |  |  |
Number of countries | country | 2 |  |  |  |  |  |
Number of states | state | 25 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Threshold period for interest to bear on receivables | 60 days |  |  |  |  |  |
Interest costs capitalized | $ 2,000,000 | $ 1,600,000 | $ 2,300,000 |  |  |  |
Restricted cash on deposit in reserve accounts, included in other non-current assets | 3,700,000 | 0 | $ 0 |  |  |  |
Debt instrument, number of manufacturer-affiliated finance companies | finance_company |  |  |  |  |  |  | 2
Accrued warranty balance |  |  |  | $ 600,000 |  | $ 500,000 |
Contract liability | 239,000,000 | 194,100,000 |  |  |  |  |
Contract liability, revenue recognized | 35,000,000 | 31,100,000 |  |  |  |  |
Contract asset | $ 9,600,000 | $ 8,200,000 |  |  |  |  |
Number of reportable segments | segment | 3 |  |  |  |  |  |
Credit Facility | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, number of counter-parties | financialInstitution |  |  |  |  | 20 |  |
Debt instrument, number of manufacturer-affiliated finance companies | finance_company |  |  |  |  | 8 |  |
Loans receivables | Automobile loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Loan receivables aged less than 60 days past due, percent (more than) |  | 95.00% |  |  |  |  |
Loan receivable on non-accrual status, percent (less than) |  | 5.00% |  |  |  |  |
Allowance for credit losses | $ 25,000,000 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Period that contracts in transit are outstanding | 5 days |  |  |  |  |  |
Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Period that contracts in transit are outstanding | 10 days |  |  |  |  |  |

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