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Business Acquisitions and Dispositions - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 Franchise Dealerships | Jun. 30, 2014 Franchise Dealerships | Mar. 31, 2014 Dealerships
Business Combinations [Abstract] |  |  |
Purchase price for franchise operations and underlying assets, including real estate, acquired |  | $ 2,573,000 |
Number of luxury franchises |  | 1 |
Aggregate purchase price luxury franchise |  | 2,600,000 |
Number of dealerships held for sale |  |  | 0
Disposed dealerships | 2 | 3 |
Cash generated from disposition | $ 13,300,000 | $ 15,200,000 |
Number of dealerships held for sale | 2 | 2 |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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