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Interim Financial Information (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2014	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Business and Organization [Line Items]
Immaterial Error of Effect of Exchange Rate on Cash and Cash Equivalents	$ 12,500	$ 1,087	$ (629)
Net Cash Provided by (Used in) Operating Activities	120,700	130,933	87,308
Number of domestic regions		2
Number of international regions		2
Assets, Current		2,024,203		1,967,938
Total assets		3,976,890		3,819,478
Liabilities, Current		1,813,047		1,865,176
East [Member]
Business and Organization [Line Items]
Number of dealerships		46
West [Member]
Business and Organization [Line Items]
Number of dealerships		72
UNITED STATES
Business and Organization [Line Items]
Number of States in which Entity Operates		15
UNITED KINGDOM
Business and Organization [Line Items]
Number of Towns in which Entity Operates		13
Number of dealerships		14
BRAZIL
Business and Organization [Line Items]
Number of States in which Entity Operates		2
Number of dealerships		19
Variable Interest Entity, Primary Beneficiary [Member]
Business and Organization [Line Items]
Assets, Current		28,734		24,170
Long-Lived Assets		40,659		71,033
Total assets		69,393		95,203
Liabilities, Current		24,498		21,653
Liabilities, Noncurrent		24,401		25,374
Liabilities		$ 48,899		$ 47,027

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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