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Interim Financial Information (Details Textual)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
dealerships
town
states
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Business And Organization [Line Items]      
Deferred income taxes     $ 14,100
Debt Issuance Costs, Current Assets     500
Number of Reportable Segments 3    
Immaterial Error of Effect of Exchange Rate on Cash and Cash Equivalents $ 841 $ (2,983)  
Net Cash Provided by (Used in) Operating Activities $ 116,075 $ 58,167  
Number of domestic regions 2    
Number of international regions 2    
Debt Issuance Costs, Long-term Assets     3,600
Variable Interest Entity [Line Items]      
Assets, Current $ 2,254,079   2,188,370
Total assets 4,533,846   4,396,716
Liabilities, Current $ 2,103,353   2,039,268
Variable Interest Entity, Ownership Percentage 8.00%    
Variable Interest Entity, Primary Beneficiary [Member]      
Variable Interest Entity [Line Items]      
Assets, Current $ 17,596   12,849
Long-Lived Assets 12,106   11,022
Total assets 29,702   23,871
Liabilities, Current 13,950   8,257
Liabilities, Noncurrent 18,820   17,064
Total liabilities $ 32,770   $ 25,321
East [Member]      
Business And Organization [Line Items]      
Number of dealerships | dealerships 37    
West [Member]      
Business And Organization [Line Items]      
Number of dealerships | dealerships 77    
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 19    
Number of dealerships | dealerships 29    
Brazil [Member]      
Business And Organization [Line Items]      
Number of States in which Entity Operates | states 3    
Number of dealerships | dealerships 17