Related Party Transactions (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 27, 2015	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2010	Jan. 01, 2018
Related Party Transactions (Textual) [Abstract]
Railcar leasing cost of revenues		$ (12,491,000)	$ (10,856,000)	$ (38,871,000)	$ (34,532,000)
Revenue from related parties		0
Inventory, Net		79,655,000		79,655,000		$ 54,147,000		$ 51,326,000
Axis [Member]
Related Party Transactions (Textual) [Abstract]
Term of agreement							1 year
Service Agreement Renewal Period							1 year
Revenue from related parties						300,000
Term Loan and Credit Agreement [Member] | Axis [Member]
Related Party Transactions (Textual) [Abstract]
Notes receivable		7,400,000		7,400,000		11,800,000
M.W. Recycling [Member]
Related Party Transactions (Textual) [Abstract]
Revenue from related parties		700,000	600,000	1,100,000	2,100,000
Insight Portfolio [Member] | Maximum [Member]
Related Party Transactions (Textual) [Abstract]
Expense with related parties		(100,000)	(100,000)	(100,000)	(100,000)
Joint Ventures [Member]
Related Party Transactions (Textual) [Abstract]
Expense with related parties		(3,400,000)	(3,400,000)	$ (10,500,000)	$ (14,000,000)
Purchasing and Engineering Services Agreement [Member] | ACF [Member]
Related Party Transactions (Textual) [Abstract]
Percentage of consideration under agreement				30.00%	30.00%
Revenue from related parties		0	0	$ 0	$ 0
Repair Services and Support Agreement [Member] [Domain] | ACF [Member]
Related Party Transactions (Textual) [Abstract]
Percentage of consideration under agreement	30.00%
Revenue from related parties		100,000	100,000	100,000	200,000
Railcar Purchase and Sale Agreement [Member] | ACF [Member]
Related Party Transactions (Textual) [Abstract]
Expense with related parties		0	0	0	0
Component sales [Domain] | ACF [Member]
Related Party Transactions (Textual) [Abstract]
Revenue from related parties		2,600,000	0	$ 2,600,000	0
Railcar services agreement [Member] | ARL [Member]
Related Party Transactions (Textual) [Abstract]
Term of agreement				3 years
Service Agreement Renewal Period				1 year
Revenue from related parties		0	0	$ 0	10,100,000
Railcar management agreement [Member] | ARL [Member]
Related Party Transactions (Textual) [Abstract]
Expense with related parties		0	0	0	(300,000)
Railcar leasing cost of revenues		0	0	0	(2,800,000)
Component purchases [Member] | ACF [Member]
Related Party Transactions (Textual) [Abstract]
Component purchases from ACF		700,000	800,000	2,400,000	4,300,000
Rail Management Transition Agreement [Member] | American Entertainment Properties Corporation [Member]
Related Party Transactions (Textual) [Abstract]
Due from Affiliate, Current		0		0		$ 400,000
Railcar Leases [Member] | IELP Entities [Member]
Related Party Transactions (Textual) [Abstract]
Revenue from related parties			200,000	1,200,000	700,000
Railcar Services [Member] | RemainCo [Member] [Domain]
Related Party Transactions (Textual) [Abstract]
Revenue from related parties		$ 0	$ 1,100,000	$ 0	$ 1,200,000