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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Business Combinations [Abstract]        
Income (loss) from operations $ (998) $ 719 $ (1,280) $ 205
Gain (loss) on disposal 1,057 7,260 955 7,624
Property impairment charges (10,096)   (10,096)  
Pre-tax income (loss) (10,037) 7,979 (10,421) 7,829
Total revenues $ 4,504 $ 82,783 $ 10,603 $ 155,232