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Business Acquisitions and Dispositions - Revenues and Other Activities Associated with Dealerships Classified as Discontinued Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Business Combinations [Abstract]        
Income (loss) from operations $ (393) $ (181) $ (645) $ (770)
Gain (loss) on disposal   97   53
Lease exit accrual adjustments and charges (116) (43) (555) (375)
Pre-tax income (loss) $ (509) $ (127) $ (1,200) $ (1,092)