Segment Information (Details) (USD $) In Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues
Revenues	$ 2,951,046	$ 2,669,773	$ 8,623,710	$ 7,697,770
Adjusted segment income
Adjusted segment income	70,400	51,918	187,096	137,439
Retail [Member]
Revenues
Revenues	2,951,046	2,669,773	8,623,710	7,697,770
Adjusted segment income
Adjusted segment income	61,925	45,153	171,229	127,077
PAG Investments [Member]
Adjusted segment income
Adjusted segment income	$ 8,475	$ 6,765	$ 15,867	$ 10,362

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration