Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Business Combinations [Abstract]      
Income (loss) from operations $ (364) $ (4,958) $ (2,475)
Gain (loss) on disposal (47) 2,748 11,079
Property and equipment impairment charges (4) (10,096) (125)
Pre-tax income (loss) $ (415) (12,306) 8,479
Total revenues   $ 95,168 $ 311,978