Quarterly report pursuant to Section 13 or 15(d)

Business Acquisitions and Dispositions - Results Associated with Disposed Dealerships That Remain in Continued Operations (Detail)

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Business Acquisitions and Dispositions - Results Associated with Disposed Dealerships That Remain in Continued Operations (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Business Combinations [Abstract]        
Income (loss) from operations $ (61) $ (467) $ (507) $ (1,175)
Gain (loss) on disposal 7,260   7,624  
Pre-tax income (loss) 7,199 (467) 7,117 (1,175)
Total revenues $ 21,870 $ 23,628 $ 42,485 $ 49,612