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Segment Information - Summary of Reportable Operating Segment (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |
Total consolidated revenues | $ 2,400,773 | $ 2,287,822
Total segment income (loss) | 9,511 | 28,062
Interest expense, other, net | (13,456) | (13,409)
Other income (expense), net | 89 | (14,501)
Income (loss) from continuing operations before taxes | (3,856) | 152
Franchised Dealerships Segment |  |
Segment Reporting Information [Line Items] |  |
Total consolidated revenues | 2,269,269 | 2,246,025
Total segment income (loss) | 23,764 | 33,470
Pre-Owned Stores Segment |  |
Segment Reporting Information [Line Items] |  |
Total consolidated revenues | 131,504 | 41,797
Total segment income (loss) | $ (14,253) | $ (5,408)

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