Debt Narrative - Senior Unsecured Notes and Secured Term Loan Facility - Railcar (Details) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended								12 Months Ended			1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012 Railcar Segment [Member]	Dec. 31, 2012 Railcar Segment [Member]	Dec. 31, 2011 Railcar Segment [Member]	Dec. 31, 2010 Railcar Segment [Member]	Dec. 31, 2012 Railcar Segment [Member] Senior unsecured notes [Member]	Feb. 28, 2007 Railcar Segment [Member] Senior unsecured notes [Member]	Feb. 01, 2013 Railcar Segment [Member] Term Loan [Member]	Dec. 31, 2012 Railcar Segment [Member] Term Loan [Member]	Dec. 01, 2012 Railcar Segment [Member] Term Loan [Member]	Dec. 31, 2012 Loss on extinguishment of debt	Dec. 31, 2011 Loss on extinguishment of debt	Dec. 31, 2010 Loss on extinguishment of debt	Sep. 30, 2012 Loss on extinguishment of debt Railcar Segment [Member]	Jan. 31, 2013 Repayment of Debt [Member] Railcar Segment [Member]
Debt Instrument [Line Items]
Aggregate principal amount issued, long-term debt									$ 275,000,000			$ 199,800,000
Draw on term loan, initial draw												98,100,000
Fair value of long-term debt	8,600,000,000	6,500,000,000									100,000,000
Long-term Debt											100,000,000
Draw on term loan, first draw										50,000,000
Debt Instrument, Basis Spread on Variable Rate												2.50%
Repayments of debt				100,000,000													175,000,000
Other (loss) income, net	$ (178,000,000)	$ (78,000,000)	$ (64,000,000)		$ (3,000,000)	$ (8,000,000)	$ (8,000,000)						$ (10,000,000)	$ 0	$ (40,000,000)	$ (2,000,000)
Interest rate, long-term debt								7.50%
Fixed coverage ratio								2.0
Redemption percentage of principal amount																	100.00%