Derivative Instruments (Details Textual) (Designated as hedging instrument, USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014 Expired hedges 2006 secured railcar equipment notes	Mar. 31, 2014 Expired hedges Promissory notes	Mar. 31, 2014 Expired hedges TRIP Holdings warehouse loan	Mar. 31, 2014 Open hedges Promissory notes	Mar. 31, 2014 Open hedges TRIP Master Funding secured railcar equipment notes	Jul. 31, 2011 Open hedges TRIP Master Funding secured railcar equipment notes
Derivative Instruments (Textual) [Abstract]
Notional amount	$ 200.0	$ 370.0	$ 788.5	$ 408.3	$ 64.4	$ 94.1
Changes in fair value of cash flow hedges which is being amortized to income (loss)	4.5	(24.5)
Expected effect during next twelve months			$ 5.1

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994

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- Definition

Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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