Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Details)

v3.19.1
Commitments and Contingencies - Additional Information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Other Commitments [Line Items]    
Lease exit costs accrual $ 0 $ 4,634,000
Maximum exposure associated with general indemnifications $ 24,200,000 $ 13,200,000
General indemnifications minimum expiration period 1 year  
General indemnifications maximum expiration period 3 years  
Percentage of dealership that is accounted for under the equity method 50.00% 50.00%
Contingent liability reserve balance after reduction $ 4,300,000 $ 4,300,000
Acquired business, earnings targets, maximum term 10 years  
Maximum aggregate earnout payment $ 80,000,000.0  
Earnout accrual recorded in other long-term liabilities 15,600,000  
Earnout accrual 7,800,000  
Earnout accrual recorded in other accrued liabilities 7,800,000  
Other accrued liabilities    
Other Commitments [Line Items]    
Amount reserved for pending proceedings 1,400,000 2,100,000
Other long-term liabilities    
Other Commitments [Line Items]    
Amount reserved for pending proceedings $ 300,000 $ 300,000