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Segment Information - Summary of Reportable Operating Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Total consolidated revenues | $ 2,405,746 | $ 2,382,312 | $ 4,693,568 | $ 4,616,939
Total segment income (loss) | 33,027 | 50,355 | 61,089 | 86,224
Interest expense, other, net | (12,764) | (12,205) | (26,172) | (24,544)
Other income (expense), net | 7 | 6 | (14,495) | 110
Income (loss) from continuing operations before taxes | 20,270 | 38,156 | 20,422 | 61,790
Franchised Dealerships [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total consolidated revenues | 2,356,692 | 2,352,840 | 4,602,717 | 4,563,425
Total segment income (loss) | 40,544 | 53,561 | 74,013 | 92,854
Echo Park [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total consolidated revenues | 49,054 | 29,472 | 90,851 | 53,514
Total segment income (loss) | $ (7,517) | $ (3,206) | $ (12,924) | $ (6,630)

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