Acquisitions and Dispositions (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 dealerships	Sep. 30, 2012	Dec. 31, 2012
Business Acquisition [Line Items]
Assets, Current	$ 1,707,975,000		$ 1,707,975,000		$ 1,566,181,000
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships acquired			24
Other Expenses	0	0	789,000	0
Cash paid in acquisitions, net of cash received			(106,672,000)	(116,528,000)
Inventories, net	1,351,719,000		1,351,719,000		1,194,288,000
Property, Plant and Equipment, Net	716,514,000		716,514,000		667,768,000
Total assets	3,409,908,000		3,409,908,000		3,023,015,000
Liabilities, Current	1,584,517,000		1,584,517,000		1,395,578,000
Total [Member]
Business Acquisition [Line Items]
Assets, Current	32,370,000		32,370,000
Acquisitions and Dispositions (Textual) [Abstract]
Acquisition Costs, Cumulative	6,500,000		6,500,000
Business Acquisition, Cost of Acquired Entity, Purchase Price	190,400,000		190,400,000
Business Combination, Consideration Transferred	1,390,000		1,390,000
Debt assumed as part of consideration paid	65,100,000		65,100,000
Inventories, net	105,455,000		105,455,000
Property, Plant and Equipment, Net	32,043,000		32,043,000
Intangible Assets, Net (Including Goodwill)	226,631,000		226,631,000
Other Assets	1,869,000		1,869,000
Total assets	398,368,000		398,368,000
Liabilities, Current	116,993,000		116,993,000
Deferred Tax Liabilities, Net	22,290,000		22,290,000
Long-term Debt	68,639,000		68,639,000
Liabilities	207,922,000		207,922,000
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			2
U.S. [Member]
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships disposed	2		6
Number of Franchises Disposed			1
UNITED STATES
Acquisitions and Dispositions (Textual) [Abstract]
Number of dealerships acquired				7
U.S. [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Goodwill Amount	13,600,000		13,600,000
Acquisitions and Dispositions (Textual) [Abstract]
Gain (Loss) on Sale of Business	1,400,000		10,400,000
Intangible Assets, Net (Including Goodwill)	762,380,000		762,380,000		752,372,000
Total assets	2,845,727,000		2,845,727,000		2,860,771,000
U.K. [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Goodwill Amount	1,600,000		1,600,000
Acquisitions and Dispositions (Textual) [Abstract]
Intangible Assets, Net (Including Goodwill)	27,663,000		27,663,000		26,070,000
Total assets	228,192,000		228,192,000		162,244,000
Brazil [Member]
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Goodwill Amount	112,100,000		112,100,000
Acquisitions and Dispositions (Textual) [Abstract]
Intangible Assets, Net (Including Goodwill)	179,634,000		179,634,000		0
Total assets	$ 335,989,000		$ 335,989,000		$ 0