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Interim Financial Information - Business and Organization (Details)
Mar. 31, 2019
town
states
international_region
state
dealership
Business And Organization [Line Items]  
Number of international regions | international_region 2
U.S.  
Business And Organization [Line Items]  
Number of states in which the entity operates | state 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
Brazil  
Business And Organization [Line Items]  
Number of states in which the entity operates | states 4
Number of dealerships 18