Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Details)

v3.19.2
Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Dec. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Schedule of Equity Method Investments [Line Items]          
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount   $ 400   $ 400  
Discrete charge for non-deductible disposition     $ 600   $ 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   27.40% 32.40% 29.60% 29.70%
Discrete charge for non-deductible executive compensation, transition costs   $ 1,500   $ 1,500  
Tax expense for uncertain tax positions       200 $ 200
Discrete benefit related to vested or exercised stock compensation       200 900
Income benefit   $ (10,071) $ (8,222) $ (29,058) $ (6,380)
Minimum          
Schedule of Equity Method Investments [Line Items]          
Expected annual effective tax rate in future periods       26.00%  
Maximum          
Schedule of Equity Method Investments [Line Items]          
Expected annual effective tax rate in future periods       29.00%  
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