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Debt Narrative - Senior Unsecured Notes - Railcar (Details) (Railcar Segment [Member], Senior unsecured notes [Member], USD $) In Millions, unless otherwise specified				6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Feb. 28, 2007	Jun. 30, 2012 Debt repurchase date range, from March 1, 2012 to February 28, 2013 [Member]	Dec. 31, 2011 Debt repurchase date range, from March 1, 2012 to February 28, 2013 [Member]	Jun. 30, 2012 Debt repurchase date range, on or after March 1, 2013 [Member]	Dec. 31, 2011 Debt repurchase date range, on or after March 1, 2013 [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued, long-term debt			$ 275
Interest rate, long-term debt	7.50%	7.50%
Fixed coverage ratio	2.0
Redemtion percentage of principal amount				101.875%	101.88%	100.00%	100.00%

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- Definition

Debt Instrument, Repurchase Percentage of Principal Amount, excluding accrued and unpaid interest

+ References

No definition available.

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Interest rate stated in the contractual debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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