For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Operating Segment and Sales and Credit Concentrations (Details 2)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Affiliated Entity [Member] \| Manufacturing [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	0.00%	0.30%
Affiliated Entity [Member] \| Railcar Leasing [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	0.20%	0.00%
Affiliated Entity [Member] \| Railcar Services [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	5.40%	4.50%
Sales Revenue, Segment [Member] \| Manufacturing [Member]
Segment Reporting Information [Line Items]
Concentration Risk, Percentage	42.70%	50.00%
Accounts Receivable [Member] \| Manufacturing [Member]
Segment Reporting Information [Line Items]
Percentage of total consolidated revenues from significant customers	23.00%		53.40%