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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Discrete charge for non-deductible executive compensation, transition costs |  |  |  |  |  | $ 1,500
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount |  | $ 3,400 |  | $ 400 | $ 200 | $ 400
Percentage of dealership that is accounted for under the equity method |  | 50.00% |  |  | 50.00% |
Contract work in process | $ 5,100 |  | $ 4,600 |  |  |
Effective tax rate from continuing operations |  | 17.20% | 18.30% | 27.40% |  | 29.60%
Tax expense for uncertain tax positions |  |  |  |  | $ 1,400 | $ 200
Discrete benefit related to vested or exercised stock compensation |  |  |  |  | 200 | 200
Discrete charge related to non-deductible asset impairment charge |  | $ 300 |  |  |  |
Income benefit |  | (6,437) |  | $ (10,071) | 37,680 | (29,058)
Impairment charges |  | 833 | $ (800) | 0 | 268,833 | 1,952
Goodwill, Impairment Loss |  |  |  |  | 268,000 |
Income Tax Benefit Goodwill Impairment |  |  |  |  | 55,800 |
Effective Income Tax Rate Reconciliation, Tax Settlement, State and Local, Amount |  | $ 3,400 |  | $ 400 | $ 200 | $ 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 | $ 12,900 | $ 8,500 |  |  | $ 8,500 |

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