Annual report pursuant to Section 13 and 15(d)

Description of Business and Summary of Significant Accounting Policies - Range of Estimated Useful Lives (Details)

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Description of Business and Summary of Significant Accounting Policies - Range of Estimated Useful Lives (Details)
 12 Months Ended
Dec. 31, 2018
Leasehold and Land Improvements | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 10 years
Leasehold and Land Improvements | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 30 years
Buildings | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 10 years
Buildings | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 30 years
Parts and service equipment | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 7 years
Parts and service equipment | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 10 years
Office equipment and fixtures | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Office equipment and fixtures | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 10 years
Company vehicles | Minimum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 3 years
Company vehicles | Maximum  
Property, Plant and Equipment [Line Items]  
Estimated useful lives 5 years