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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Other Commitments [Line Items] |  |
Maximum exposure associated with general indemnifications | $ 4.0 | $ 25.0
General indemnifications minimum expiration period | 1 year |
General indemnifications maximum expiration period | 3 years |
Percentage of dealership that is accounted for under the equity method | 50.00% |
Contingent liability reserve balance after reduction | $ 4.3 | $ 4.3

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