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Interim Financial Information (Details Textual) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Business and Organization [Line Items]
Immaterial Error of Effect of Exchange Rate on Cash and Cash Equivalents	$ (563)	$ (2,297)
Net Cash Provided by (Used in) Operating Activities	271,836	128,966
Number of domestic regions	2
Number of international regions	2
Assets, Current	1,929,255		1,967,938
Total assets	3,962,509		3,819,478
Liabilities, Current	1,802,639		1,865,176
East [Member]
Business and Organization [Line Items]
Number of dealerships	41
West [Member]
Business and Organization [Line Items]
Number of dealerships	75
UNITED STATES
Business and Organization [Line Items]
Number of States in which Entity Operates	14
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	3
Number of dealerships	20
Variable Interest Entity, Primary Beneficiary [Member]
Business and Organization [Line Items]
Assets, Current	24,536		24,170
Long-Lived Assets	36,843		71,033
Total assets	61,379		95,203
Liabilities, Current	21,857		21,653
Liabilities, Noncurrent	22,179		25,374
Liabilities	$ 44,036		$ 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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Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

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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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