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Business Acquisitions and Dispositions - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 Business | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) retail_Units | Jun. 30, 2020 USD ($) Business
Business Combinations [Abstract] |  |  |  |
Number of acquired franchises | Business | 2 |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of franchises disposed |  |  | 1 | 1
Net cash generated from disposition |  |  | $ 3,800 |
Proceeds from sales of dealerships |  |  | $ 3,798 | $ (886)
Stand-alone pre-owned vehicle business |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition, consideration amount |  | $ 28,600 |  |

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