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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

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- 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. + 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 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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