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Interim Financial Information - Business and Organization (Details)
Jun. 30, 2018
dealerships
town
states
international_region
Business And Organization [Line Items]  
Number of international regions | international_region 2
Brazil  
Business And Organization [Line Items]  
Number of states in which the entity operates | states 4
Number of dealerships 17
United States  
Business And Organization [Line Items]  
Number of states in which the entity operates | states 15
Number of dealerships 116
United Kingdom  
Business And Organization [Line Items]  
Number of towns in which the entity operates | town 32
Number of dealerships 47