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Interim Financial Information (Details Textual) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) dealerships town states | Sep. 30, 2015 USD ($) dealerships town states | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Business And Organization [Line Items] |  |  |  |
Number of geographic regions |  | 4 |  |
Number of Reportable Segments |  | 3 |  |
Immaterial Error of Effect of Exchange Rate on Cash and Cash Equivalents |  | $ (5,246,000) | $ (563,000) |
Net Cash Provided by (Used in) Operating Activities |  | $ 230,868,000 | $ 271,836,000 |
Number of domestic regions | 2 | 2 |  |
Number of international regions | 2 | 2 |  |
Variable Interest Entity [Line Items] |  |  |  |
Assets, Current | $ 2,044,790,000 | $ 2,044,790,000 |  | $ 2,035,219,000
Total assets | 4,292,050,000 | 4,292,050,000 |  | 4,141,492,000
Liabilities, Current | $ 1,981,847,000 | 1,981,847,000 |  | 1,922,199,000
Variable Interest Entity, Ownership Percentage | 8.00% |  |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Assets, Current | $ 12,280,000 | 12,280,000 |  | 19,049,000
Long-Lived Assets | 20,764,000 | 20,764,000 |  | 31,783,000
Total assets | 33,044,000 | 33,044,000 |  | 50,832,000
Liabilities, Current | 9,259,000 | 9,259,000 |  | 16,374,000
Liabilities, Noncurrent | 15,215,000 | 15,215,000 |  | 15,955,000
Total liabilities | $ 24,474,000 | $ 24,474,000 |  | $ 32,329,000
East [Member] |  |  |  |
Business And Organization [Line Items] |  |  |  |
Number of dealerships | dealerships | 40 | 40 |  |
West [Member] |  |  |  |
Business And Organization [Line Items] |  |  |  |
Number of dealerships | dealerships | 77 | 77 |  |
U.S. [Member] |  |  |  |
Business And Organization [Line Items] |  |  |  |
Number of States in which Entity Operates | states | 14 | 14 |  |
U.K. [Member] |  |  |  |
Business And Organization [Line Items] |  |  |  |
Number of Towns in which Entity Operates | town | 15 | 15 |  |
Number of dealerships | dealerships | 17 | 17 |  |
Brazil [Member] |  |  |  |
Business And Organization [Line Items] |  |  |  |
Number of States in which Entity Operates | states | 3 | 3 |  |
Number of dealerships | dealerships | 19 | 19 |  |

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