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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
Mar. 31, 2016
Mar. 31, 2015
Business Combinations [Abstract]    
Income (loss) from operations $ (194) $ (335)
Lease exit accrual adjustments and charges 455 (356)
Pre-tax income (loss) $ 261 $ (691)