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Segment Information - Summary of Reportable Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues | $ 2,667,939 | $ 2,505,701 | $ 2,405,746 | $ 2,287,822 | $ 2,556,913 | $ 2,557,928 | $ 2,382,312 | $ 2,234,626 | $ 9,867,208 | $ 9,731,779 | $ 9,624,299 |
Total segment income (loss) |  |  |  |  |  |  |  |  | 175,170 | 205,193 | 195,967 |
Interest expense, other, net |  |  |  |  |  |  |  |  | (52,524) | (50,106) | (50,910) |
Other income (expense), net |  |  |  |  |  |  |  |  | (14,522) | 125 | 99 |
Income (loss) from continuing operations before taxes |  |  |  |  |  |  |  |  | 108,124 | 155,212 | 145,156 |
Total floor plan interest expense |  |  |  |  |  |  |  |  | 36,395 | 27,716 | 21,326 |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 88,944 | 77,446 | 68,799 |
Total capital expenditures |  |  |  |  |  |  |  |  | 234,245 | 206,232 | 173,249 |
Total assets | 3,818,518 |  |  |  | 3,639,336 |  |  |  | 3,818,518 | 3,639,336 |  |
Cash and cash equivalents | 6,352 |  |  |  | 3,108 |  |  |  | 6,352 | 3,108 | 3,625 | $ 4,182
Goodwill, Net | 525,780 |  |  |  | 472,437 |  |  |  | 525,780 | 472,437 | 471,493 |
Other Intangible Assets, net | 74,589 |  |  |  | 80,233 |  |  |  | 74,589 | 80,233 |  |
Other Corporate and Other Assets | 1,080,961 |  |  |  | 859,656 |  |  |  | 1,080,961 | 859,656 |  |
Franchised Dealerships Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  |  |  |  |  |  |  |  | 9,612,899 | 9,590,752 | 9,547,236 |
Total segment income (loss) |  |  |  |  |  |  |  |  | 196,897 | 218,769 | 213,224 |
Total floor plan interest expense |  |  |  |  |  |  |  |  | 35,030 | 26,631 | 20,727 |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 83,741 | 73,591 | 65,766 |
Total capital expenditures |  |  |  |  |  |  |  |  | 195,220 | 166,405 | 148,593 |
Total assets | 1,930,336 |  |  |  | 2,079,297 |  |  |  | 1,930,336 | 2,079,297 |  |
Goodwill, Net | 465,800 |  |  |  |  |  |  |  | 465,800 |  |  |
Pre-Owned Stores Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total consolidated revenues |  |  |  |  |  |  |  |  | 254,309 | 141,027 | 77,063 |
Total segment income (loss) |  |  |  |  |  |  |  |  | (21,727) | (13,576) | (17,257) |
Total floor plan interest expense |  |  |  |  |  |  |  |  | 1,365 | 1,085 | 599 |
Total depreciation and amortization |  |  |  |  |  |  |  |  | 5,203 | 3,855 | 3,033 |
Total capital expenditures |  |  |  |  |  |  |  |  | 39,025 | 39,827 | $ 24,656 |
Total assets | 200,500 |  |  |  | $ 144,605 |  |  |  | 200,500 | $ 144,605 |  |
Goodwill, Net | $ 60,000 |  |  |  |  |  |  |  | $ 60,000 |  |  |

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