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Interest Rate Swaps (Details) (Forward Starting Interest Rate Swap Agreements, USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2012 Fair Value, Inputs, Level 2	Dec. 31, 2011 Fair Value, Inputs, Level 2	Sep. 30, 2012 Floating Rate Floor Plan Debt	Sep. 30, 2011 Floating Rate Floor Plan Debt	Sep. 30, 2012 Floating Rate Floor Plan Debt LIBOR portion	Jan. 31, 2011 Floating Rate Floor Plan Debt LIBOR portion	Sep. 30, 2012 Floating Rate Floor Plan Debt Fixed rate portion
Derivative
Portion of floating rate floor plan debt fixed by swap agreements							$ 300,000	$ 300,000	$ 100,000
Interest rate swap, fixed							2.135%	3.67%	1.55%
Estimated liabilities of swaps designated as hedging instruments, fair value			16,057	15,952
Increase in interest expense	$ 1,800	$ 5,300
Increase in the weighted average interest rate on floor plan borrowings due to the swaps					0.37%	0.39%

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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X

- Definition

Increase in interest expense from interest rate swaps for the period.

+ References

No definition available.

+ Details

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- Definition

Represents the impact on the weighted average interest rate from interest rate swaps for the period.

+ References

No definition available.

+ Details

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X

- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 205G

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44C

-Subparagraph a

-Clause 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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