Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

v3.19.3
Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]          
Discrete charge for non-deductible executive compensation, transition costs   $ 800   $ 1,500 $ 800
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount   $ 400   $ 400  
Discrete charge for non-deductible disposition         $ 600
Percentage of dealership that is accounted for under the equity method 50.00% 50.00%   50.00%  
Contract work in process $ 4,700     $ 4,800  
Effective tax rate from continuing operations   28.00% 32.40% 29.20% 31.10%
Tax expense for uncertain tax positions       $ 200 $ 200
Discrete benefit related to vested or exercised stock compensation       200 900
Income benefit   $ (11,372) $ (7,331) (40,430) $ (13,711)
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount   $ 400   $ 400  
Dealership          
Schedule of Equity Method Investments [Line Items]          
Percentage of dealership that is accounted for under the equity method   50.00%   50.00%  
ASU 2014-09 | Finance, insurance and other, net          
Schedule of Equity Method Investments [Line Items]          
Contract assets $ 5,400 $ 5,900   $ 5,900