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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, 2020 USD ($) State reporting_unit Store Dealerships Segment Brand Collision | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of operating segments | Segment | 2 |  |
Number of new vehicle dealerships | Dealerships | 96 |  |
Number of states | State | 12 |  |
Number of different brands of cars and light trucks | Brand | 21 |  |
Number of collision repair centers | Collision | 14 |  |
Operating lease liabilities | $ 338,903 |  |
ROU assets | 330,322 | $ 337,842 |
Revenue allowances for commission reserves | 34,200 | 32,000 |
Amount recognized for floor plan assistance | $ 40,600 | 41,500 | $ 42,200
Term for funding of finance contracts | 10 days |  |
Contracts in transit included in receivables, net | $ 179,700 | 230,900 |
Receivables, net | $ 371,666 | 432,742 |
Number of reporting units | reporting_unit | 2 |  |
Goodwill | $ 213,977 | 475,791 | 509,592
Insurance reserves | 25,800 | 23,100 |
Concentrations of credit risk with respect to receivables are limited primarily to receivables from automobile manufacturers | 80,200 | 94,800 |
Advertising expense | 42,200 | 60,800 | 63,100
Cooperative manufacturer credits advertising expenses | $ 19,200 | 25,300 | $ 26,700
Number of reportable Segment | Segment | 2 |  |
Income Tax Benefit Goodwill Impairment | $ 51,300 |  |
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 | 208,800 | $ 258,700 |
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 |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Goodwill | $ 147,300 |  |
EchoPark |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Goodwill | $ 66,700 |  |
Franchised dealerships |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Stores | Store | 84 |  |
EchoPark |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of Stores | Store | 16 |  |

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