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Segment Information - Summary of Reportable Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues | $ 2,556,913 | $ 2,557,928 | $ 2,382,312 | $ 2,234,626 | $ 2,470,635 | $ 2,494,408 | $ 2,423,740 | $ 2,235,516 | $ 9,731,779 | $ 9,624,299 | $ 9,197,099 |
Total segment income (loss) |  |  |  |  |  |  |  |  | 205,193 | 195,967 | 214,820 |
Interest expense, other, net |  |  |  |  |  |  |  |  | (50,106) | (50,910) | (53,190) |
Other income (expense), net |  |  |  |  |  |  |  |  | 125 | 99 | 97 |
Income (loss) from continuing operations before taxes |  |  |  |  |  |  |  |  | 155,212 | 145,156 | 161,727 |
Total floor plan interest expense |  |  |  |  |  |  |  |  | 27,716 | 21,326 | 18,793 |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 77,446 | 68,799 | 58,260 |
Total capital expenditures |  |  |  |  |  |  |  |  | 206,232 | 173,249 | 146,432 |
Total assets | 3,639,336 |  |  |  | 3,562,381 |  |  |  | 3,639,336 | 3,562,381 |  |
Cash and cash equivalents | 3,108 |  |  |  | 3,625 |  |  |  | 3,108 | 3,625 | 4,182 | $ 3,016
Goodwill, Net | 472,437 |  |  |  | 471,493 |  |  |  | 472,437 | 471,493 | 475,929 |
Other Intangible Assets, net | 80,233 |  |  |  | 80,876 |  |  |  | 80,233 | 80,876 |  |
Other Corporate and other assets | 859,656 |  |  |  | 718,347 |  |  |  | 859,656 | 718,347 |  |
Franchised Dealerships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  |  |  |  |  |  |  |  | 9,602,562 | 9,547,236 | 9,191,661 |
Total segment income (loss) |  |  |  |  |  |  |  |  | 217,306 | 213,224 | 230,733 |
Total floor plan interest expense |  |  |  |  |  |  |  |  | 26,777 | 20,727 | 18,727 |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 73,635 | 65,766 | 58,001 |
Total capital expenditures |  |  |  |  |  |  |  |  | 170,876 | 148,593 | 117,129 |
Total assets | 2,095,777 |  |  |  | 2,211,232 |  |  |  | 2,095,777 | 2,211,232 |  |
Echo Park [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  |  |  |  |  |  |  |  | 129,217 | 77,063 | 5,438 |
Total segment income (loss) |  |  |  |  |  |  |  |  | (12,113) | (17,257) | (15,913) |
Total floor plan interest expense |  |  |  |  |  |  |  |  | 939 | 599 | 66 |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 3,811 | 3,033 | 259 |
Total capital expenditures |  |  |  |  |  |  |  |  | 35,356 | 24,656 | $ 29,303 |
Total assets | $ 128,125 |  |  |  | $ 76,808 |  |  |  | $ 128,125 | $ 76,808 |  |

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