Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions and Dispositions - Revenues and Other Activities Associated with Disposed Dealerships That Remain in Continuing Operations (Detail)

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Business Acquisitions and Dispositions - Revenues and Other Activities Associated with Disposed Dealerships That Remain in Continuing Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Business Combinations [Abstract]        
Income (loss) from operations $ (70) $ 160 $ 203 $ 124
Gain (loss) on disposal 8,490 29 8,466 (30)
Pre-tax income (loss) 8,420 189 8,669 94
Total revenues $ 7,082 $ 17,679 $ 36,447 $ 49,778