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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |
Discrete charge for non-deductible executive compensation, transition costs |  |  | $ 1,500
Percentage of dealership that is accounted for under the equity method |  | 50.00% |
Contract work in process | $ 5,100 | $ 3,600 |
Effective tax rate from continuing operations |  | 18.20% | 31.00%
Tax expense for uncertain tax positions |  | $ 100 | $ 200
Discrete benefit related to vested or exercised stock compensation |  | 500 | 200
Income benefit |  | 44,117 | (18,987)
Impairment charges |  | 268,000 | $ 1,952
Income Tax Benefit Goodwill Impairment |  | $ 51,300 |
Dealership |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Percentage of dealership that is accounted for under the equity method |  | 50.00% |
ASU 2014-09 | Finance, insurance and other, net |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Contract assets | $ 12,900 | $ 5,200 |

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