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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 | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Business Combinations [Abstract] |  |  |  |
Income (loss) from operations | $ (707) | $ (441) | $ (2,166) | $ (344)
Gain (loss) on disposal | (542) | 3,111 | 414 | 10,734
Property impairment charges |  |  | (10,096) |
Pre-tax income (loss) | (1,249) | 2,670 | (11,848) | 10,390
Total revenues | $ 36 | $ 39,778 | $ 11,602 | $ 195,558

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- Definition Disposal group not discontinued operation income loss before income tax. + References No definition available. + Details
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- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2443-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230 + Details
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