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Summary of Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax benefit related to an original equipment manufacturer emissions-related settlement | $ 14,800 |  |  |  |  |  |  |  |
Asset impairment charges | 1,800 | $ 6,100 |  | $ 1,300 | $ 10,500 | $ 6,200 | $ 8,063 | $ 17,955 | $ 6,594
Pre-tax benefit related to lease exit and storm damage accrual adjustments | 400 |  |  |  |  |  |  |  |
Pre-tax benefit (charges) related to lease exit accrual adjustments | $ (500) | (1,000) | $ 500 |  |  |  |  |  |
Pre-tax charges against to natural damages |  | $ 2,300 | $ 6,000 |  | 4,200 |  |  |  |
Pre-tax gain (loss) on disposal |  |  |  |  |  |  | $ (47) | $ 2,748 | $ 11,079
Pre-tax severance expenses |  |  |  |  |  | $ 900 |  |  |
Franchised Dealerships [Member] |  |  |  |  |  |  |  |  |
Condensed Unaudited Quarterly Financial Data [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax gain (loss) on disposal |  |  |  | $ 2,300 | $ 1,100 |  |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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