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Long-term Debt (Narrative) (Details)			9 Months Ended
	Aug. 01, 2017 USD ($) financial_institution finance_companies	Jul. 24, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Total long-term debt outstanding			$ 1,015,912,000		$ 793,065,000
Underwriting and other fees of issuance			4,517,000	$ 0
Senior Notes | Senior Notes Due 2025
Debt Instrument [Line Items]
Total long-term debt outstanding		$ 300,000,000	$ 300,000,000		0
Stated interest rate (percent)		5.25%	5.25%
Redemption percentage price (percent)		100.00%
Percentage of principal amount redeemable (percent)		101.00%
Underwriting and other fees of issuance		$ 5,000,000
Line of Credit
Debt Instrument [Line Items]
Total long-term debt outstanding			$ 226,654,000		$ 353,507,000
Line of Credit | Amended Revolving Credit Facility
Debt Instrument [Line Items]
Total financing commitment	$ 2,400,000,000.0
Number of financial institutions | financial_institution	18
Number of manufactured-affiliated finance companies | finance_companies	7
Higher borrowing capacity option	$ 2,750,000,000.00
Line of Credit | Amended Revolving Credit Facility | New Vehicle Inventory Floor Plan Pricing
Debt Instrument [Line Items]
Total financing commitment	1,900,000,000.0
Line of Credit | Amended Revolving Credit Facility | Used Vehicle Inventory Floor Plan Financing
Debt Instrument [Line Items]
Total financing commitment	250,000,000
Line of Credit | Amended Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Total financing commitment	$ 250,000,000

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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