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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) | 12 Months Ended |  |
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Dec. 31, 2019 USD ($) Dealerships Brand Collision State Store Segment reporting_unit | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 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 | 99 |  |  |  |
Number of states | State | 12 |  |  |  |
Number of different brands of cars and light trucks | Brand | 21 |  |  |  |
Number of collision repair centers | Collision | 15 |  |  |  |
Operating lease liabilities | $ 347,483,000 |  |  | $ 419,500,000 |
ROU assets | 337,842,000 | $ 0 |  | $ 387,970,000 |
Book overdraft position |  | 0 |  |  |
Revenue allowances for commission reserves | 32,000,000.0 | 25,800,000 |  |  |
Amount recognized for floor plan assistance | $ 41,500,000 | 42,200,000 | $ 45,300,000 |  |
Term for funding of finance contracts | 10 days |  |  |  |
Contracts in transit included in receivables, net | $ 230,900,000 | 227,800,000 |  |  |
Receivables, net | $ 432,742,000 | 438,186,000 |  |  | $ 486,716,000
Number of reporting units | reporting_unit | 2 |  |  |  |
Goodwill | $ 475,791,000 | 509,592,000 | 525,780,000 |  |
Insurance reserves | 23,100,000 | 22,900,000 |  |  |
Concentrations of credit risk with respect to receivables are limited primarily to receivables from automobile manufacturers | 94,800,000 | 93,800,000 |  |  |
Advertising expense | 60,800,000 | 63,100,000 | 61,600,000 |  |
Cooperative manufacturer credits advertising expenses | $ 25,300,000 | 26,700,000 | $ 26,000,000.0 |  |
Number of reportable Segment | Segment | 2 |  |  |  |
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 | $ 258,700,000 |  |  |  |
Franchise assets |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Franchise asset impairment charge |  | 2,100,000 |  |  |
Continuing operations | Franchise assets |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Franchise asset impairment charge | $ 0 | $ 2,100,000 |  |  |
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 | $ 415,800,000 |  |  |  |
EchoPark |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Goodwill | $ 60,000,000.0 |  |  |  |
Franchised dealerships |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of Stores | Store | 86 |  |  |  |
EchoPark |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of Stores | Store | 9 |  |  |  |

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