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Commitments and Contingencies (Details Textual)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2017
dealerships
Manufacturer [Line Items]    
Proceeds from Legal Settlements | $ $ 13.2  
Volkswagen legal claims | $ $ 14,700.0  
Volkswagen [Member]    
Manufacturer [Line Items]    
Number Of Dealerships | dealerships   7
NumberOfInstallmentsReceived [Line Items]   8
TotalNumberOfInstallments   18
Audi [Member]    
Manufacturer [Line Items]    
Number Of Dealerships | dealerships   3