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Business Acquisitions and Dispositions - Additional Information (Details) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 USD ($) Business | Sep. 30, 2022 USD ($) retail_Units Business | Sep. 30, 2021 Business | Sep. 30, 2021 USD ($) | Sep. 30, 2021 retail_Units
Business Combinations [Abstract] |  |  |  |  |
Number of acquired franchises | Business | 3 |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of franchises disposed |  | 0 | 0 |  | 1
Net cash generated from disposition |  | $ 0 |  |  |
Proceeds from sales of dealerships |  | 0 |  | $ 3,900,000 |
Number of acquired franchises | Business | 3 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory |  | 4,300,000 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles |  | 1,100,000 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Consideration Transferred |  | 14,700,000 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Assets |  | 3,400,000 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities |  | $ 5,900,000 |  |  |
Mid-line import franchise |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Net cash generated from disposition |  |  |  | $ 3,900,000 |
EchoPark Segment [Member] |  |  |  |  |
Business Combinations [Abstract] |  |  |  |  |
Number of acquired franchises | Business |  | 1 |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquired franchises | Business |  | 1 |  |  |
Stand-alone pre-owned vehicle business |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | $ 31,000,000 | $ 31,000,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | 500,000 | 500,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 33,200,000 | $ 33,200,000 |  |  |
Franchised [Member] |  |  |  |  |
Business Combinations [Abstract] |  |  |  |  |
Number of acquired franchises | Business |  | 2 |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of acquired franchises | Business |  | 2 |  |  |

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