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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, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Business Combinations [Abstract]
Income (loss) from operations	$ (162)	$ (135)	$ (441)	$ (327)
Lease exit accrual adjustments and charges	(139)	(227)	(727)	227
Pre-tax income (loss)	$ (301)	$ (362)	$ (1,168)	$ (100)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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