Acquisitions and Dispositions (Details textuals) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue	$ 9,429,095,000	$ 8,827,801,000
Business Acquisition, Cost of Acquired Entity, Purchase Price	350,200,000
Acquisitions and Dispositions (Textual) [Abstract]
Consideration received for franchise dispositions	97,500,000	33,700,000
Proceeds from sale of property held for sale			4,100,000
Number Of Dealerships Acquired		16
Business Combination, Acquisition Related Costs	6,500,000
Payments to Acquire Businesses, Net of Cash Acquired	(269,860,000)	(177,956,000)	(159,597,000)
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	1.39
Business Acquisition, Purchase Price Allocation, Liabilities Assumed	65,100,000
Other Expenses	789,000	0	0
Gain (Loss) on Sale of Business	10,200,000
Brazil
Acquisitions and Dispositions (Textual) [Abstract]
Number Of Dealerships Acquired	18
Number of franchises acquired	22
Number of collision centers acquired	5
Business Acquisition, Purchase Price Allocation, Goodwill Amount	124,900,000
UNITED KINGDOM
Acquisitions and Dispositions (Textual) [Abstract]
Number Of Dealerships Acquired	4	6
Business Acquisition, Purchase Price Allocation, Goodwill Amount	1,500,000
Number of dealerships disposed		1
United States
Acquisitions and Dispositions (Textual) [Abstract]
Number Of Dealerships Acquired	9	10	7
Business Acquisition, Purchase Price Allocation, Goodwill Amount	$ 54,800,000
Number of dealerships disposed	6	3
Number of franchises disposed	1	2
Number of franchises awarded			3