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Interim Financial Information (Details Textual) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 USD ($) dealerships town states | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Business and Organization [Line Items] |  |  |
Immaterial Error of Effect of Exchange Rate on Cash and Cash Equivalents | $ (1,612) | $ 1,087 |
Net Cash Provided by (Used in) Operating Activities | $ 80,575 | $ 130,933 |
Number of domestic regions | 2 |  |
Number of international regions | 2 |  |
Assets, Current | $ 2,099,365 |  | $ 2,035,219
Total assets | 4,302,974 |  | 4,141,492
Liabilities, Current | $ 2,010,599 |  | 1,922,199
East [Member] |  |  |
Business and Organization [Line Items] |  |  |
Number of dealerships | dealerships | 40 |  |
West [Member] |  |  |
Business and Organization [Line Items] |  |  |
Number of dealerships | dealerships | 76 |  |
U.S. [Member] |  |  |
Business and Organization [Line Items] |  |  |
Number of States in which Entity Operates | states | 14 |  |
U.K. [Member] |  |  |
Business and Organization [Line Items] |  |  |
Number of Towns in which Entity Operates | town | 15 |  |
Number of dealerships | dealerships | 17 |  |
Brazil [Member] |  |  |
Business and Organization [Line Items] |  |  |
Number of States in which Entity Operates | states | 3 |  |
Number of dealerships | dealerships | 15 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Business and Organization [Line Items] |  |  |
Assets, Current | $ 18,777 |  | 19,049
Long-Lived Assets | 27,241 |  | 31,783
Total assets | 46,018 |  | 50,832
Liabilities, Current | 17,262 |  | 16,374
Liabilities, Noncurrent | 17,358 |  | 15,955
Total liabilities | $ 34,620 |  | $ 32,329

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