Quarterly report pursuant to Section 13 or 15(d)

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

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Business Acquisitions and Dispositions - Revenues and Other Activities Associated with Disposed Dealerships That Remain in Continued Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Business Combinations [Abstract]        
Income (loss) from operations $ (707) $ (441) $ (2,166) $ (344)
Gain (loss) on disposal (542) 3,111 414 10,734
Property impairment charges     (10,096)  
Pre-tax income (loss) (1,249) 2,670 (11,848) 10,390
Total revenues $ 36 $ 39,778 $ 11,602 $ 195,558