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Business Acquisitions and Dispositions - Additional Information (Detail)

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Business Acquisitions and Dispositions - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2014
Franchise
Dealerships
Business Combinations [Abstract]  
Purchase price for franchise operations and underlying assets, including real estate, acquired $ 2,573,000
Number of luxury franchises 1
Number of luxury franchises disposed 1
Cash generated from disposition $ 1,900,000
Number of dealerships held for sale 0