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Detail of Certain Balance Sheet Accounts (Inventories) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Summary of inventories
Lower of cost or market reserves	$ 6,895	$ 6,362
Inventories, net	1,657,105	1,556,705
Inventory, Gross	1,664,000	1,563,067
New Vehicles [Member]
Summary of inventories
Inventory, Gross	1,175,623	1,137,478
Used Vehicles [Member]
Summary of inventories
Inventory, Gross	297,309	254,939
Rental Vehicles [Member]
Summary of inventories
Inventory, Gross	120,145	103,184
Parts, accessories and other [Member]
Summary of inventories
Inventory, Gross	$ 70,923	$ 67,466

X

- Definition

Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount of valuation reserve for inventory.

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