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Segment Information - Summary of Reportable Operating Segment (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) Segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income (loss) |  |  |  |  |  |  |  |  | $ 307,706,000 | $ 177,663,000 | $ 211,565,000 |  |
Interest expense, other, net |  |  |  |  |  |  |  |  | (52,953,000) | (54,059,000) | (52,524,000) |  |
Other income (expense), net |  |  |  |  |  |  |  |  | (6,589,000) | 106,000 | (14,522,000) |  |
Income (loss) from continuing operations before taxes |  |  |  |  |  |  |  |  | 199,645,000 | 75,312,000 | 108,124,000 |  |
Segment Schedule Footnotes |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges | $ 17,700,000 |  |  | $ 1,900,000 | $ 15,600,000 |  | $ 10,300,000 | $ 3,600,000 | 20,768,000 | 29,514,000 | 9,394,000 |  |
Storm-related physical damage |  |  |  |  |  | $ 1,200,000 | 3,100,000 |  |  |  |  |  |
Executive transition costs |  |  |  |  |  | 1,600,000 |  |  | 6,300,000 | 1,600,000 | 1,300,000 |  |
Nonrecurring Compensation Expense |  |  |  | 6,300,000 |  |  | 23,300,000 | 9,200,000 |  | 32,500,000 |  |  |
Gain (Loss) on Extinguishment of Debt | (7,200,000) |  |  |  |  |  |  |  | 6,690,000 | 0 | 14,607,000 |  |
Total floor plan interest expense |  |  |  |  |  |  |  |  | 48,519,000 | 48,398,000 | 36,395,000 |  |
Depreciation, Depletion and Amortization, Nonproduction |  |  |  |  |  |  |  |  | 93,169,000 | 93,623,000 | 88,944,000 |  |
Total assets | 4,071,035,000 |  |  |  | 3,796,807,000 |  |  |  | 4,071,035,000 | 3,796,807,000 |  |  |
Cash and cash equivalents | 29,103,000 |  |  |  | 5,854,000 |  |  |  | 29,103,000 | 5,854,000 | 6,352,000 |  | $ 3,108,000
Goodwill | 475,791,000 |  |  |  | 509,592,000 |  |  |  | 475,791,000 | 509,592,000 | 525,780,000 |  |
Intangible Assets, Net (Excluding Goodwill) | 64,300,000 |  |  |  | 69,705,000 |  |  |  | $ 64,300,000 | 69,705,000 |  | $ 65,700,000 |
Number of operating segments | Segment |  |  |  |  |  |  |  |  | 2 |  |  |  |
Segment Income |  |  |  |  |  |  |  |  | $ 220,413,000 | 104,826,000 | 117,518,000 |  |
EchoPark Segment Income |  |  |  |  |  |  |  |  | 9,146,000 | (52,587,000) | (20,950,000) |  |
Segment Retail Units Sold |  |  |  |  |  |  |  |  |  |  |  |  |
Franchised Dealerships New Vehicle Revenue |  |  |  |  |  |  |  |  | 4,889,171 | 4,974,097 | 5,295,051 |  |
Franchised Dealerships Used Vehicle Revenue |  |  |  |  |  |  |  |  | 2,493,467 | 2,370,799 | 2,406,407 |  |
Franchised Dealerships Wholesale Revenue |  |  |  |  |  |  |  |  | 180,020 | 197,184 | 161,581 |  |
Franchised Dealerships Fixed Ops Revenue |  |  |  |  |  |  |  |  | 1,366,550 | 1,364,559 | 1,401,802 |  |
Franchised Dealerships F&I Revenue |  |  |  |  |  |  |  |  | 363,117 | 344,814 | 348,058 |  |
Franchised Dealerships Segment Revenue |  |  |  |  |  |  |  |  | 9,292,325 | 9,251,453 | 9,612,899 |  |
Revenues | $ 2,748,404,000 | $ 2,702,720,000 | $ 2,614,081,000 | $ 2,389,138,000 | $ 2,574,259,000 | $ 2,470,849,000 | $ 2,505,749,000 | $ 2,400,773,000 |  |  |  |  |
EchoPark Used Vehicle Revenue |  |  |  |  |  |  |  |  | 996,504 | 602,698 | 215,646 |  |
EchoPark Wholesale Revenue |  |  |  |  |  |  |  |  | 22,927 | 20,443 | 9,483 |  |
EchoPark Fixed Ops Revenue |  |  |  |  |  |  |  |  | 28,753 | 16,327 | 14,208 |  |
EchoPark F&I Revenue |  |  |  |  |  |  |  |  | 113,834 | 60,709 | 14,972 |  |
EchoPark Segment Revenue |  |  |  |  |  |  |  |  | 1,162,018 | 700,177 | 254,309 |  |
EchoPark Total Impairment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  | 19,667,000 | 1,582,000 | 1,903,000 |  |
Franchised Dealership Impairment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Schedule Footnotes |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  |  |  | $ 1,101,000 | $ 27,932,000 | $ 7,491,000 |  |

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