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Detail of Certain Balance Sheet Accounts (Inventories) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Summary of inventories
New Vehicles Inventory, Gross	$ 1,304,103	$ 1,262,797
Used Vehicles Inventory, Gross	309,969	275,508
Rental Vehicles Inventory, Gross	145,780	134,509
Parts, Accessories and Other Inventory, Gross	74,133	72,917
Inventory, Gross	1,833,985	1,745,731
Lower of cost or market reserves	7,454	7,980
Inventories, net	$ 1,826,531	$ 1,737,751

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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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- Definition

Rental Vehicles Inventory, Gross

+ References

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- Definition

Used Vehicles Inventory, Gross

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No definition available.

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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

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- Definition

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
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
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-URI http://asc.fasb.org/extlink&oid=51655945&loc=d3e3927-108312

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Amount of valuation reserve for inventory.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
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