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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, 2017
Mar. 31, 2016
Business Combinations [Abstract]    
Income (loss) from operations $ (1,165) $ (194)
Lease exit accrual adjustments and charges 297 455
Pre-tax income (loss) $ (868) $ 261