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Long-Term Debt -Revolving Loan (Details) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | ||||||||||||||||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
Revolving Loan [Member]
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Sep. 30, 2014
Revolving Loan [Member]
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Dec. 31, 2013
Revolving Loan [Member]
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Sep. 30, 2014
Letter of Credit [Member]
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Sep. 30, 2014
Previous Revolving Credit Facility [Member]
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Sep. 30, 2014
Accounts Payable, Inventory Financing [Member]
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Dec. 31, 2013
Accounts Payable, Inventory Financing [Member]
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Sep. 30, 2014
Accounts Payable, Inventory Financing [Member]
Revolving Loan [Member]
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Sep. 30, 2014
Accounts Payable, Inventory Financing [Member]
Previous Revolving Credit Facility [Member]
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Sep. 30, 2014
Lower Utilization [Member]
Previous Revolving Credit Facility [Member]
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Sep. 30, 2014
Higher Utilization [Member]
Previous Revolving Credit Facility [Member]
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Sep. 30, 2014
Minimum [Member]
LIBOR [Member]
Revolving Loan [Member]
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Sep. 30, 2014
Minimum [Member]
ABR [Member]
Revolving Loan [Member]
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Sep. 30, 2014
Maximum [Member]
LIBOR [Member]
Revolving Loan [Member]
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Sep. 30, 2014
Maximum [Member]
ABR [Member]
Revolving Loan [Member]
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Sep. 30, 2014
Cap agreement effective January 14, 2015-2017 [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||
| Interest Rate Cap, fair value | $ 600,000 | |||||||||||||||||||
| Variable Interest Rate Margin | 1.50% | 0.50% | 2.00% | 1.00% | ||||||||||||||||
| Potential Margin Reduction | 0.25% | 0.25% | ||||||||||||||||||
| Debt, short-term and long-term | 0 | 0 | 0 | |||||||||||||||||
| Undrawn letters of credit | 2,200,000 | |||||||||||||||||||
| Floorplan sub-facility, reserve | 292,500,000 | 292,500,000 | ||||||||||||||||||
| Amount owed under Revolving loan financing agreement | 292,500,000 | |||||||||||||||||||
| Revolving Loan inventory financing agreement | 298,800,000 | 256,100,000 | ||||||||||||||||||
| Floorplan sub-facility, variation between balance in financials and balance per financial intermediary due to timing differences in reporting | 6,300,000 | |||||||||||||||||||
| Revolving Commitment | 1,250,000,000.0 | 1,250,000,000.0 | 900,000,000 | |||||||||||||||||
| Line Of Credit Facility, Maximum Aggregate Increase | 300,000,000 | 300,000,000 | 200,000,000 | |||||||||||||||||
| Revolving Loan Maturity Acceleration Provision, Days Prior to Maturity | 45 days | |||||||||||||||||||
| Revolving Loan Maturity Acceleration Provision, Excess Cash Availability Limit, Amount Plus Maturing Debt | 150,000,000 | 150,000,000 | ||||||||||||||||||
| Borrowing Base | 1,408,100,000 | 1,408,100,000 | ||||||||||||||||||
| Availability under Revolving Loan | 955,300,000 | 955,300,000 | ||||||||||||||||||
| Line of Credit Facility, Fee on Unused Portion, Basis Points | 25 | 25 | 50 | 37.5 | ||||||||||||||||
| Line of Credit Facility, Decrease in Applicable Interest Rate Margin | 50 | 50 | ||||||||||||||||||
| Net loss on extinguishments of long-term debt | (45,800,000) | (41,300,000) | (53,800,000) | (55,500,000) | (400,000) | |||||||||||||||
| Deferred Finance Costs, Net | 6,400,000 | 6,400,000 | ||||||||||||||||||
| Floorplan sub-facility | 400,000,000 | |||||||||||||||||||
| Percentage reserve for open orders under financing agreement | 15.00% | |||||||||||||||||||
| Variable Interest Rate, ABR Determination, Basis Point Plus Federal Funds Effective Rate | 50 | 50 | ||||||||||||||||||
| Minimum Liquidity Condition, Cash Availability | 125,000,000 | 125,000,000 | ||||||||||||||||||
| Cash Availability, Percentage of Borrowing Base | 10.00% | 10.00% | ||||||||||||||||||
| Minimum Liquidity Condition, Amount | $ 100,000,000 | $ 100,000,000 | ||||||||||||||||||
| Fixed Charge Coverage Ratio | 1.00 | 1.00 | ||||||||||||||||||