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, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Combinations [Abstract]      
Income (loss) from operations $ (2,329) $ (2,154) $ (6,214)
Gain (loss) on disposal 11,188 (47) 2,748
Property and equipment impairment charges   (81) (6,584)
Pre-tax income (loss) 8,859 (2,282) (10,050)
Total revenues $ 86,111 $ 127,337 $ 215,629