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Inventories and Related Notes Payable - Floor Plan - Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
New vehicles	$ 938,263	$ 866,442
Used vehicles	171,909	175,957
Service loaners	108,136	81,384
Parts and accessories and other	63,830	54,183
Net inventories	$ 1,282,138	$ 1,177,966

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Inventory new vehicles.

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- Definition

Inventory service loaners.

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- Definition

Inventory used vehicles.

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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))

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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=6386567&loc=d3e3927-108312



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-Name Accounting Standards Codification

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Gross amount of components of assembled products that can be sold directly or indirectly through sales of assembled products.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 6

-Article 5



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