Related Party Transactions (Details) (USD $)	3 Months Ended		9 Months Ended			12 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		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	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2009 Axis [Member]	Sep. 30, 2014 Term Loan and Credit Agreement [Member] Axis [Member]	Dec. 31, 2013 Term Loan and Credit Agreement [Member] Axis [Member]	Sep. 30, 2014 M.W. Recycling [Member]	Sep. 30, 2013 M.W. Recycling [Member]	Sep. 30, 2014 M.W. Recycling [Member]	Sep. 30, 2013 M.W. Recycling [Member]	Sep. 30, 2014 Joint Ventures [Member]	Sep. 30, 2013 Joint Ventures [Member]	Sep. 30, 2014 Joint Ventures [Member]	Sep. 30, 2013 Joint Ventures [Member]	Dec. 31, 2013 Joint Ventures [Member]	Sep. 30, 2014 Insight Portfolio [Member] Maximum [Member]	Sep. 30, 2013 Insight Portfolio [Member] Maximum [Member]	Sep. 30, 2014 Insight Portfolio [Member] Maximum [Member]	Sep. 30, 2013 Insight Portfolio [Member] Maximum [Member]	Sep. 30, 2014 Purchasing and Engineering Services Agreement [Member] ACF [Member]	Sep. 30, 2013 Purchasing and Engineering Services Agreement [Member] ACF [Member]	Sep. 30, 2014 Purchasing and Engineering Services Agreement [Member] ACF [Member]	Sep. 30, 2013 Purchasing and Engineering Services Agreement [Member] ACF [Member]	Sep. 30, 2014 Railcar services agreement [Member] ARL [Member]	Sep. 30, 2013 Railcar services agreement [Member] ARL [Member]	Sep. 30, 2014 Railcar services agreement [Member] ARL [Member]	Sep. 30, 2013 Railcar services agreement [Member] ARL [Member]	Sep. 30, 2014 Railcar management agreement [Member] ARL [Member]	Sep. 30, 2013 Railcar management agreement [Member] ARL [Member]	Sep. 30, 2014 Railcar management agreement [Member] ARL [Member]	Sep. 30, 2013 Railcar management agreement [Member] ARL [Member]	Sep. 30, 2013 Railcar management agreement [Member] ARL [Member] Maximum [Member]	Sep. 30, 2014 Railcar orders [Member] IELP Entities [Member]	Sep. 30, 2013 Railcar orders [Member] IELP Entities [Member]	Sep. 30, 2014 Railcar orders [Member] IELP Entities [Member]	Sep. 30, 2013 Railcar orders [Member] IELP Entities [Member]	Sep. 30, 2014 Manufacturing services agreement [Member] ACF [Member] Maximum [Member]	Sep. 30, 2013 Manufacturing services agreement [Member] ACF [Member] Maximum [Member]	Sep. 30, 2014 Manufacturing services agreement [Member] ACF [Member] Maximum [Member]	Sep. 30, 2013 Manufacturing services agreement [Member] ACF [Member] Maximum [Member]
Related Party Transactions (Textual) [Abstract]
Component purchases from ACF																																							$ 1,300,000	$ 100,000	$ 2,200,000	$ 100,000
Percentage of consideration under agreement																								30.00%	30.00%
Term of agreement																												3 years
Service Agreement Renewal Period																												P1Y
Notes receivable							30,000,000	32,900,000
Expense with related parties													33,500,000	23,500,000	93,900,000	63,600,000		100,000	100,000	100,000	100,000									200,000		400,000	300,000	100,000
Railcar leasing cost of revenues	6,319,000	3,524,000	16,192,000	9,729,000																										1,600,000	600,000	3,400,000	1,600,000
Revenue from related parties									2,400,000	1,500,000	6,700,000	4,800,000										4,300,000	3,400,000	16,100,000	6,600,000	4,900,000	4,300,000	13,600,000	13,500,000						54,100,000	62,400,000	179,000,000	142,000,000
Company's Interest in credit facility						50.00%
Inventory, Net	$ 105,352,000		$ 105,352,000		$ 90,185,000								$ 5,900,000		$ 5,900,000		$ 6,200,000