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Segment Information - Summary of Reportable Operating Segment (Details) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) | Dec. 31, 2020 USD ($) Segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Operating income (loss) |  | $ 33,939,000 | $ 307,706,000 | $ 177,663,000 |
Interest expense, other, net |  | (41,572,000) | (52,953,000) | (54,059,000) |
Other income (expense), net |  | 97,000 | (6,589,000) | 106,000 |
Income (loss) from continuing operations before taxes |  | (34,764,000) | 199,645,000 | 75,312,000 |
Segment Schedule Footnotes |  |  |  |  |
Asset impairment charges |  | (270,017,000) | (20,768,000) | (29,514,000) |
Executive transition costs |  |  | 6,300,000 | 1,600,000 |
Nonrecurring Compensation Expense | $ 32,500,000 |  |  | 32,500,000 |
Gain (Loss) on Extinguishment of Debt |  | 0 | 6,690,000 | 0 |
Total floor plan interest expense |  | 27,228,000 | 48,519,000 | 48,398,000 |
Depreciation, Depletion and Amortization, Nonproduction |  | 91,023,000 | 93,169,000 | 93,623,000 |
Total assets |  | 3,745,993,000 | 4,071,035,000 |  |
Cash and cash equivalents |  | 170,313,000 | 29,103,000 | 5,854,000 | $ 6,352,000
Goodwill |  | 213,977,000 | 475,791,000 | 509,592,000 |
Intangible Assets, Net (Excluding Goodwill) |  | $ 64,300,000 | 64,300,000 |  |
Number of operating segments | Segment |  | 2 |  |  |
Segment Income |  | $ 235,253,000 | 220,413,000 | 104,826,000 |
EchoPark Segment Income |  | 4,078,000 | 9,146,000 | (52,587,000) |
Segment Retail Units Sold |  |  |  |  |
Franchised Dealerships New Vehicle Revenue |  | 4,281,223,000 | 4,889,171,000 | 4,974,097,000 |
Franchised Dealerships Used Vehicle Revenue |  | 2,345,936,000 | 2,493,467,000 | 2,370,799,000 |
Franchised Dealerships Wholesale Revenue |  | 168,655,000 | 180,020,000 | 197,184,000 |
Franchised Dealerships Fixed Ops Revenue |  | 1,194,394,000 | 1,366,550,000 | 1,364,559,000 |
Franchised Dealerships F&I Revenue |  | 357,848,000 | 363,117,000 | 344,814,000 |
Franchised Dealerships Segment Revenue |  | 8,348,056,000 | 9,292,325,000 | 9,251,453,000 |
EchoPark Used Vehicle Revenue |  | 1,218,896,000 | 996,505,000 | 602,699,000 |
EchoPark Wholesale Revenue |  | 28,723,000 | 22,926,000 | 20,441,000 |
EchoPark Fixed Ops Revenue |  | 39,341,000 | 28,753,000 | 16,328,000 |
EchoPark F&I Revenue |  | 132,026,000 | 113,834,000 | 60,709,000 |
EchoPark Segment Revenue |  | 1,418,986,000 | 1,162,018,000 | 700,177,000 |
Total revenues |  | 9,767,042,000 | 10,454,343,000 | 9,951,630,000 |
EchoPark Total Impairment [Member] |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |
Asset impairment charges |  | 0 | (19,667,000) | (1,600,000) |
Franchised Dealership Impairment [Member] |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |
Asset impairment charges |  | (270,017,000) |  | (27,932,000) |
Franchised Dealerships [Member] |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |
Asset impairment charges |  | $ (270,000,000.0) | (1,101,000) |  |
PreOwnedStoreMember [Member] |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |
Asset impairment charges |  |  |  | (1,582,000) |
Operating segments | Income (loss) from continuing operations before taxes | EchoPark Segment revenues |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |
Asset impairment charges |  |  | $ (19,700,000) |  |
Operating segments | Income (loss) from continuing operations before taxes | Franchised Dealership Impairment [Member] |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |
Asset impairment charges |  |  |  | $ (1,100,000) |

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