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Detail of Certain Balance Sheet Accounts (Inventories) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Summary of inventories
New Vehicles Inventory, Gross	$ 1,095,792	$ 1,156,383
Used Vehicles Inventory, Gross	344,271	294,812
Rental Vehicles Inventory, Gross	138,501	131,080
Parts, Accessories and Other Inventory, Gross	81,912	77,762
Inventory, Gross	1,660,476	1,660,037
Lower of cost or market reserves	8,687	8,222
Inventories, net	$ 1,651,789	$ 1,651,815

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- Definition

New Vehicles Inventory, Gross

+ References

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- Definition

Parts, Accessories and Other Inventory, Gross

+ References

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Rental Vehicles Inventory, Gross

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- Definition

Used Vehicles Inventory, Gross

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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))
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Amount of valuation reserve for inventory.

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-Topic 330
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