Operating Segment and Sales and Credit Concentrations (Details 2)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2014 Manufacturing [Member]	Sep. 30, 2013 Manufacturing [Member]	Sep. 30, 2014 Manufacturing [Member]	Sep. 30, 2013 Manufacturing [Member]	Sep. 30, 2014 Railcar Leasing [Member]	Sep. 30, 2013 Railcar Leasing [Member]	Sep. 30, 2014 Railcar Leasing [Member]	Sep. 30, 2013 Railcar Leasing [Member]	Sep. 30, 2014 Railcar Services [Member]	Sep. 30, 2013 Railcar Services [Member]	Sep. 30, 2014 Railcar Services [Member]	Sep. 30, 2013 Railcar Services [Member]	Sep. 30, 2014 Sales Revenue, Segment [Member] Manufacturing [Member]	Sep. 30, 2013 Sales Revenue, Segment [Member] Manufacturing [Member]	Sep. 30, 2014 Sales Revenue, Segment [Member] Manufacturing [Member]	Sep. 30, 2013 Sales Revenue, Segment [Member] Manufacturing [Member]	Sep. 30, 2014 Accounts Receivable [Member] Manufacturing [Member]	Dec. 31, 2013 Accounts Receivable [Member] Manufacturing [Member]
Segment Reporting Information [Line Items]
Percentage of revenue from affiliates	38.50%	32.90%	33.50%	26.80%	0.00%	0.00%	0.00%	0.00%	3.00%	2.20%	2.30%	2.40%
Percentage of total consolidated revenues from significant customers													51.30%	67.20%	44.90%	62.80%
Percentage of total consolidated accounts receivable from significant customers																	43.00%	22.60%