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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details) shares in Thousands, $ in Thousands | 12 Months Ended |
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Dec. 31, 2024 USD ($) Segment reporting_unit shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2024 Store | Dec. 31, 2024 store | Dec. 31, 2024 Dealerships | Dec. 31, 2024 Brand | Dec. 31, 2024 Collision | Dec. 31, 2024 State | Dec. 31, 2024
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of operating segments | Segment | 3 |  |  |  |  |  |  |  |  |
Number of new vehicle dealerships | Dealerships |  |  |  |  |  | 133 |  |  |  |
Number of states | State |  |  |  |  |  |  |  |  | 18 |
Number of different brands of cars and light trucks | Brand |  |  |  |  |  |  | 25 |  |  |
Number of collision repair centers | Collision |  |  |  |  |  |  |  | 16 |  |
Operating lease liabilities | $ 245,700 |  |  |  |  |  |  |  |  |
ROU assets | 224,300 | $ 222,600 |  |  |  |  |  |  |  |
Revenue allowances for commission reserves | 62,900 | 57,500 |  |  |  |  |  |  |  |
Amount recognized for floor plan assistance | $ 64,200 | 58,700 | $ 51,500 |  |  |  |  |  |  |
Term for funding of finance contracts | 10 days |  |  |  |  |  |  |  |  |
Contracts in transit included in receivables, net | $ 246,500 | 275,600 |  |  |  |  |  |  |  |
Receivables, net | $ 495,900 | 528,100 |  |  |  |  |  |  |  |
Number of reporting units | reporting_unit | 3 |  |  |  |  |  |  |  |  |
Goodwill | $ 358,500 | 253,800 | 231,000 |  |  |  |  |  |  |
Concentrations of credit risk with respect to receivables are limited primarily to receivables from automobile manufacturers | 130,400 | 105,300 |  |  |  |  |  |  |  |
Advertising expense | 84,500 | 92,200 | 95,400 |  |  |  |  |  |  |
Cooperative manufacturer credits advertising expenses | $ 34,700 | 34,700 | 30,800 |  |  |  |  |  |  |
Number of reportable Segment | Segment | 3 |  |  |  |  |  |  |  |  |
Manufacturer Receivables included in receivables, net | $ 130,400 | 105,300 |  |  |  |  |  |  |  |
Other Receivables included in receivables, net | 119,000 | 147,200 |  |  |  |  |  |  |  |
Goodwill, Impairment Loss | 0 |  | 202,900 |  |  |  |  |  |  |
Property and equipment impairment charges | $ 3,900 | $ 42,700 | $ 1,100 |  |  |  |  |  |  |
Weighted Average Number of Shares Outstanding, Diluted, Adjustment | shares | 900 | 900 | 1,000 |  |  |  |  |  |  |
Number of retail stores | store |  |  |  |  | 4 |  |  |  |  |
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets, Purchase Accounting Adjustments | $ 93,500 |  |  |  |  |  |  |  |  |
Deferred Income Taxes and Tax Credits | 31,000 |  |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Goodwill | 79,700 | $ 13,200 |  |  |  |  |  |  |  |
Deferred Tax Liabilities, Goodwill | $ 62,500 |  |  |  |  |  |  |  |  |
BMW [Domain] |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage | 20.00% |  |  |  |  |  |  |  |  |
Mercedes [Domain] |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage | 11.00% | 11.00% | 10.00% |  |  |  |  |  |  |
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 | $ 279,600 | $ 317,900 |  |  |  |  |  |  |  |
Franchise assets |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Franchise asset impairment charge | 0 |  |  |  |  |  |  |  |  |
Indefinite-Lived Intangible Assets (Excluding Goodwill) | 430,300 | $ 417,400 | $ 396,700 |  |  |  |  |  |  |
Continuing operations | Franchise assets |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Franchise asset impairment charge | 116,400 |  | $ 116,400 |  |  |  |  |  |  |
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 |  |  |  | 108 |  |  |  |  |  |
Finite-Lived Intangible Assets, Net | 331,200 |  |  |  |  |  |  |  |  |
Echo Park [Member] |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Stores | Store |  |  |  | 18 |  |  |  |  |  |
Number of states | store |  |  |  |  | 10 |  |  |  |  |
Powersports Dealerships |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Stores |  |  |  | 11 | 15 |  |  |  |  |
Finite-Lived Intangible Assets, Net | $ 27,300 |  |  |  |  |  |  |  |  |
Powrsports |  |  |  |  |  |  |  |  |  |
Description Of Business And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of states | store |  |  |  |  | 3 |  |  |  |  |

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