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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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