Inventory Financing Agreements (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Inventory Financing Agreements [Line Items]
Accounts payable-inventory financing	$ 250,200,000	$ 256,600,000
Accounts Payable, Inventory Financing [Member]
Inventory Financing Agreements [Line Items]
Revolving Loan inventory financing agreement	250,100,000	256,100,000
Other inventory financing agreements	100,000	500,000
Accounts payable-inventory financing	250,200,000	256,600,000
Floorplan sub-facility	400,000,000
Other inventory financing agreements, current	$ 100,000	$ 500,000