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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) Brand Store Collision Segment State reporting_unit Dealerships | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of operating segments | Segment | 2 |  |
Number of new vehicle dealerships | Dealerships | 140 |  |
Number of states | State | 17 |  |
Number of different brands of cars and light trucks | Brand | 28 |  |
Number of collision repair centers | Collision | 17 |  |
Operating lease liabilities | $ 301,000 |  |
ROU assets | 293,200 | $ 330,300 |
Amount recognized for floor plan assistance | $ 46,500 | 40,600 | $ 41,500
Term for funding of finance contracts | 10 days |  |
Contracts in transit included in receivables, net | $ 143,000 | 179,700 |
Receivables, net | $ 401,100 | 371,700 |
Number of reporting units | reporting_unit | 2 |  |
Goodwill | $ 416,400 | 214,000 | 475,800
Concentrations of credit risk with respect to receivables are limited primarily to receivables from automobile manufacturers | 69,600 | 80,200 |
Advertising expense | 61,600 | 42,200 | 60,800
Cooperative manufacturer credits advertising expenses | $ 22,100 | 19,200 | $ 25,300
Number of reportable Segment | Segment | 2 |  |
Income Tax Benefit Goodwill Impairment |  | 51,300 |
Manufacturer Receivables included in receivables, net | $ 59,900 | 72,100 |
Other Receivables included in receivables, net | $ 198,200 | 119,900 |
Number of Stores with Franchise Rights | Dealerships | 47 |  |
Goodwill, Impairment Loss |  | 268,000 |
Financial institutions |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentrations of credit risk with respect to receivables are limited primarily to receivables from financial institutions | $ 175,200 | 208,800 |
Franchise assets |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Franchise asset impairment charge |  | $ 0 |
Continuing operations | Franchise assets |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Franchise asset impairment charge | $ 0 |  |
Dealership |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Percentage of dealership that is accounted for under the equity method | 50.00% |  |
Franchised Dealerships [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Stores | Store | 110 |  |
Echo Park [Member] |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Stores | Store | 46 |  |

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