Acquisitions and Dispositions (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 dealerships	Jun. 30, 2012	Dec. 31, 2012
Business Acquisition [Line Items]
Assets, Current	$ 1,730,800,000		$ 1,730,800,000		$ 1,566,181,000
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships acquired			23
Other Expenses	0	0	789,000	0
Cash paid in acquisitions, net of cash received			(89,775,000)	(114,958,000)
Inventories, net	1,358,294,000		1,358,294,000		1,194,288,000
Property, Plant and Equipment, Net	706,293,000		706,293,000		667,768,000
Total assets	3,409,318,000		3,409,318,000		3,023,015,000
Liabilities, Current	1,642,842,000		1,642,842,000		1,395,578,000
Total [Member]
Business Acquisition [Line Items]
Assets, Current	32,385,000		32,385,000
Acquisitions and Dispositions (Textual) [Abstract]
Acquisition Costs, Cumulative	6,500,000		6,500,000
Business Acquisition, Cost of Acquired Entity, Purchase Price	173,300,000		173,300,000
Business Combination, Consideration Transferred	1,450,000		1,450,000
Debt assumed as part of consideration paid	65,100,000		65,100,000
Inventories, net	97,723,000		97,723,000
Property, Plant and Equipment, Net	31,730,000		31,730,000
Intangible Assets, Net (Including Goodwill)	211,391,000		211,391,000
Other Assets	1,870,000		1,870,000
Total assets	375,099,000		375,099,000
Liabilities, Current	109,937,000		109,937,000
Deferred Tax Liabilities, Net	23,189,000		23,189,000
Long-term Debt	68,639,000		68,639,000
Liabilities	201,765,000		201,765,000
BRAZIL
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships acquired			18
Number of franchises acquired			22
BRAZIL | Collision Centers [Member]
Acquisitions and Dispositions (Textual) [Abstract]
Number of franchises acquired			5
UNITED KINGDOM
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships acquired			4	6
TEXAS
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships acquired			1
CALIFORNIA
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships disposed			3
GEORGIA
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships disposed			1
UNITED STATES
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships acquired				6
U.S. [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Goodwill Amount	8,800,000		8,800,000
Acquisitions and Dispositions (Textual) [Abstract]
Gain (Loss) on Sale of Business	8,400,000		9,000,000
Intangible Assets, Net (Including Goodwill)	754,539,000		754,539,000		752,372,000
Total assets	2,886,311,000		2,886,311,000		2,860,771,000
U.K. [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Goodwill Amount	1,500,000		1,500,000
Acquisitions and Dispositions (Textual) [Abstract]
Intangible Assets, Net (Including Goodwill)	26,076,000		26,076,000		26,070,000
Total assets	205,034,000		205,034,000		162,244,000
Brazil [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Goodwill Amount	106,400,000		106,400,000
Acquisitions and Dispositions (Textual) [Abstract]
Intangible Assets, Net (Including Goodwill)	175,215,000		175,215,000		0
Total assets	$ 317,973,000		$ 317,973,000		$ 0