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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 |

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