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Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for Adoption of ASC 606 (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Revenues: |  |  |
Parts, service and collision repair | $ 351,758,000 | $ 352,043,000 |
Finance, insurance and other, net | 93,725,000 | 83,063,000 |
Total revenues | 2,400,773,000 | 2,287,822,000 |
Cost of Sales: |  |  |
Parts, service and collision repair | (182,130,000) | (182,699,000) |
Selling, general and administrative expenses: |  |  |
Operating income (loss) | 20,188,000 | $ 36,449,000 |
Assets: |  |  |
Receivables, net | 367,895,000 |  | $ 482,126,000
Liabilities: |  |  |
Other accrued liabilities | 226,530,000 |  | 237,963,000
Deferred Income Taxes | 54,524,000 |  | 51,619,000
Stockholders’ Equity: |  |  |
Retained earnings | 624,535,000 |  | 625,356,000
Contract work in process | 4,700,000 |  |
ASU 2014-09 |  |  |
Revenues: |  |  |
Parts, service and collision repair | 351,758,000 |  |
Finance, insurance and other, net | 93,725,000 |  |
Total revenues | 445,483,000 |  |
Cost of Sales: |  |  |
Parts, service and collision repair | (182,130,000) |  |
Selling, general and administrative expenses: |  |  |
Compensation | (185,037,000) |  |
Operating income (loss) | 20,188,000 |  |
Assets: |  |  |
Receivables, net |  |  | 486,716,000
Contract Assets |  |  | 2,082,000
Liabilities: |  |  |
Other accrued liabilities |  |  | 236,677,000
Deferred Income Taxes |  |  | 50,151,000
Stockholders’ Equity: |  |  |
Retained earnings |  |  | 621,438,000
ASU 2014-09 | F&I |  |  |
Assets: |  |  |
Contract Assets | 2,600,000 |  |
ASU 2014-09 | Previously reported |  |  |
Assets: |  |  |
Receivables, net |  |  | 482,126,000
Contract Assets |  |  | 0
Liabilities: |  |  |
Other accrued liabilities |  |  | 237,963,000
Deferred Income Taxes |  |  | 51,619,000
Stockholders’ Equity: |  |  |
Retained earnings |  |  | 625,356,000
ASU 2014-09 | Effects of Adoption of ASC 606 |  |  |
Assets: |  |  |
Receivables, net |  |  | 4,590,000
Contract Assets |  |  | 2,082,000
Liabilities: |  |  |
Other accrued liabilities |  |  | (1,286,000)
Deferred Income Taxes |  |  | (1,468,000)
Stockholders’ Equity: |  |  |
Retained earnings |  |  | $ (3,918,000)
ASU 2014-09 | Pre-ASC 606 Results |  |  |
Revenues: |  |  |
Parts, service and collision repair | 351,202,000 |  |
Finance, insurance and other, net | 93,302,000 |  |
Total revenues | 444,504,000 |  |
Cost of Sales: |  |  |
Parts, service and collision repair | (181,842,000) |  |
Selling, general and administrative expenses: |  |  |
Compensation | (185,000,000) |  |
Operating income (loss) | 19,534,000 |  |
ASU 2014-09 | Effects of Adoption of ASC 606 |  |  |
Revenues: |  |  |
Parts, service and collision repair | 556,000 |  |
Finance, insurance and other, net | 423,000 |  |
Total revenues | 979,000 |  |
Cost of Sales: |  |  |
Parts, service and collision repair | (288,000) |  |
Selling, general and administrative expenses: |  |  |
Compensation | (37,000) |  |
Operating income (loss) | $ 654,000 |  |

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