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Acquisitions and Dispositions Acquisitions and Dispositions (Details textuals)
 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Business Acquisition [Line Items]    
Total assets $ 4,302,974,000 $ 4,141,492,000
Acquisitions and Dispositions (Textual) [Abstract]    
Business Combination, Consideration Transferred   $ 336,600,000
Gain (Loss) on Disposition of Business $ 700,000.0  
U.S. [Member]    
Acquisitions and Dispositions (Textual) [Abstract]    
Number of Franchises Disposed 1  
Number Of Dealerships Acquired 2 7
Number of franchises awarded   2
Business Acquisition Purchase Price Allocation Goodwill $ 103,600,000  
Number of Dealerships Disposed 1  
U.K. [Member]    
Acquisitions and Dispositions (Textual) [Abstract]    
Number Of Dealerships Acquired   3
Business Acquisition Purchase Price Allocation Goodwill $ 18,500,000  
Brazil [Member]    
Acquisitions and Dispositions (Textual) [Abstract]    
Number of Franchises Disposed 2  
Number Of Dealerships Acquired   1
Number of franchises awarded   1
Business Acquisition Purchase Price Allocation Goodwill $ 0  
Businesses acquired [Member]    
Business Acquisition [Line Items]    
Total assets   $ 409,713,000