Operating Segment and Sales and Credit Concentrations (Details 2)	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014 Manufacturing [Member]	Jun. 30, 2013 Manufacturing [Member]	Jun. 30, 2014 Manufacturing [Member]	Jun. 30, 2013 Manufacturing [Member]	Jun. 30, 2014 Railcar Leasing [Member]	Jun. 30, 2013 Railcar Leasing [Member]	Jun. 30, 2014 Railcar Leasing [Member]	Jun. 30, 2013 Railcar Leasing [Member]	Jun. 30, 2014 Railcar Services [Member]	Jun. 30, 2013 Railcar Services [Member]	Jun. 30, 2014 Railcar Services [Member]	Jun. 30, 2013 Railcar Services [Member]	Jun. 30, 2014 Sales Revenue, Segment [Member] Manufacturing [Member]	Jun. 30, 2013 Sales Revenue, Segment [Member] Manufacturing [Member]	Jun. 30, 2014 Sales Revenue, Segment [Member] Manufacturing [Member]	Jun. 30, 2013 Sales Revenue, Segment [Member] Manufacturing [Member]	Jun. 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	38.40%	12.50%	31.50%	23.40%	0.00%	0.00%	0.00%	0.00%	2.00%	2.90%	2.10%	2.60%
Percentage of total consolidated revenues from significant customers													63.10%	64.80%	47.50%	63.30%
Percentage of total consolidated accounts receivable from significant customers																	26.30%	22.60%