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Summary of Significant Accounting Policies - Cumulative Effect of Adjustments for Adoption of ASC 606 (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Revenues: |  |  |  |  |  |
Revenues | $ 2,470,849 | $ 2,505,701 | $ 7,377,372 | $ 7,199,269 |  |
Cost of Sales: |  |  |  |  |  |
Cost of Sales | (2,110,313) | (2,143,079) | (6,301,962) | (6,125,683) |  |
Selling, general and administrative expenses | (289,022) |  | (871,410) |  |  |
Operating income (loss) | 48,137 | 55,762 | 118,972 | 134,381 |  |
Assets: |  |  |  |  |  |
Receivables, net | 350,912 |  | 350,912 |  | $ 486,716 | $ 482,126
Contract assets |  |  |  |  | 2,082 |
Liabilities: |  |  |  |  |  |
Other accrued liabilities | 241,443 |  | 241,443 |  | 239,249 | 237,963
Deferred income taxes | 50,449 |  | 50,449 |  | 53,087 | 51,619
Stockholders' Equity: |  |  |  |  |  |
Retained earnings | 651,436 |  | 651,436 |  | 629,274 | 625,356
Parts, service and collision repair |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Revenues | 343,118 | 347,717 | 1,041,630 | 1,060,873 |  |
Cost of Sales: |  |  |  |  |  |
Cost of Sales | (176,302) | (180,047) | (538,135) | (550,788) |  |
Finance, insurance and other, net |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Revenues | 98,061 | $ 92,861 | 295,890 | $ 262,832 |  |
Total revenues |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Revenues | 441,179 |  | 1,337,520 |  |  |
Pre-ASC 606 Results |  |  |  |  |  |
Cost of Sales: |  |  |  |  |  |
Selling, general and administrative expenses | (288,639) |  | (871,394) |  |  |
Operating income (loss) | 45,121 |  | 112,974 |  |  |
Pre-ASC 606 Results | Parts, service and collision repair |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Revenues | 340,600 |  | 1,041,424 |  |  |
Cost of Sales: |  |  |  |  |  |
Cost of Sales | (175,153) |  | (537,990) |  |  |
Pre-ASC 606 Results | Finance, insurance and other, net |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Revenues | 96,031 |  | 289,937 |  |  |
Pre-ASC 606 Results | Total revenues |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Revenues | 436,631 |  | 1,331,361 |  |  |
Pre-ASC 606 Results | Previously reported |  |  |  |  |  |
Assets: |  |  |  |  |  |
Receivables, net |  |  |  |  |  | 482,126
Contract assets |  |  |  |  |  | 0
Liabilities: |  |  |  |  |  |
Other accrued liabilities |  |  |  |  |  | 237,963
Deferred income taxes |  |  |  |  |  | 51,619
Stockholders' Equity: |  |  |  |  |  |
Retained earnings |  |  |  |  |  | $ 625,356
ASU 2014-09 | Finance, insurance and other, net |  |  |  |  |  |
Assets: |  |  |  |  |  |
Contract assets | 8,000 |  | 8,000 |  |  |
ASU 2014-09 | Effects of Adoption of ASC 606 |  |  |  |  |  |
Cost of Sales: |  |  |  |  |  |
Selling, general and administrative expenses | (383) |  | (16) |  |  |
Operating income (loss) | 3,016 |  | 5,998 |  |  |
ASU 2014-09 | Effects of Adoption of ASC 606 | Parts, service and collision repair |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Revenues | 2,518 |  | 206 |  |  |
Cost of Sales: |  |  |  |  |  |
Cost of Sales | (1,149) |  | (145) |  |  |
ASU 2014-09 | Effects of Adoption of ASC 606 | Finance, insurance and other, net |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Revenues | 2,030 |  | 5,953 |  |  |
ASU 2014-09 | Effects of Adoption of ASC 606 | Total revenues |  |  |  |  |  |
Revenues: |  |  |  |  |  |
Revenues | $ 4,548 |  | $ 6,159 |  |  |
ASU 2014-09 | Effects of Adoption of ASC 606 | Effects of Adoption of ASC 606 |  |  |  |  |  |
Assets: |  |  |  |  |  |
Receivables, net |  |  |  |  | 4,590 |
Contract assets |  |  |  |  | 2,082 |
Liabilities: |  |  |  |  |  |
Other accrued liabilities |  |  |  |  | 1,286 |
Deferred income taxes |  |  |  |  | 1,468 |
Stockholders' Equity: |  |  |  |  |  |
Retained earnings |  |  |  |  | $ 3,918 |

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