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Credit Facilities and Long-term Debt (Narrative) (Details) |  | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 24, 2017 USD ($) | Sep. 30, 2018 USD ($) | Jun. 25, 2018 USD ($) financial_institution finance_companies | Jun. 24, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Total long-term debt outstanding |  | $ 1,327,346,000 |  |  | $ 1,054,271,000
Line of Credit | Syndicated Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Number of financial institutions | financial_institution |  |  | 20 |  |
Number of manufacturer-affiliated finance companies | finance_companies |  |  | 7 |  |
Total financing commitment |  |  | $ 2,600,000,000.0 | $ 2,400,000,000.0 |
Aggregate commitment, maximum borrowing capacity |  |  | 3,000,000,000.0 |  |
Senior Notes | Senior Notes Due 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total long-term debt outstanding | $ 300,000,000 | $ 300,000,000 |  |  | 300,000,000
Stated interest rate (percent) | 5.25% | 5.25% |  |  |
Redemption percentage price (percent) | 100.00% |  |  |  |
Percentage of principal amount redeemable (percent) | 101.00% |  |  |  |
Used Vehicle Inventory Financing | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total long-term debt outstanding |  | $ 316,000,000 |  |  | 177,222,000
Used Vehicle Inventory Financing | Line of Credit | Syndicated Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total financing commitment |  |  | $ 318,000,000 |  |
Aggregate commitment, threshold percentage |  |  | 16.50% |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Annual interest rate |  | 3.76% |  |  |
Total long-term debt outstanding |  | $ 60,058,000 |  |  | $ 94,568,000
Revolving Credit Facility | Line of Credit | Syndicated Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total financing commitment |  |  | $ 266,000,000 |  |
Aggregate commitment, threshold percentage |  |  | 18.75% |  |
New Vehicle Floor Plan | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Annual interest rate |  | 3.51% |  |  |
New Vehicle Floor Plan | Line of Credit | Syndicated Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Total financing commitment |  |  | $ 2,000,000,000.0 |  |
Aggregate commitment, increase limit |  |  | $ 400,000,000 |  |
London Interbank Offered Rate (LIBOR) | Used Vehicle Inventory Financing | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 1.50% |  |  |
London Interbank Offered Rate (LIBOR) | New Vehicle Floor Plan | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 1.25% |  |  |
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 1.25% |  |  |
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Line of Credit |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate |  | 2.25% |  |  |

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