Partially-Owned Leasing Subsidiaries (Details Textual) (USD $) In Millions, unless otherwise specified	9 Months Ended			9 Months Ended		1 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Leasing Group	Sep. 30, 2014 Leasing Group Partially-owned subsidiaries subsidiaries board_members	Sep. 30, 2014 Leasing Group TRIP Leasing Railcar	May 31, 2014 Leasing Group TRIP Holdings	Sep. 30, 2014 Leasing Group TRIP Holdings
Schedule of Investments [Line Items]
Number of subsidiaries				2
Number of board members				7
Number of TILC designated board members				2
Number of railcars owned					0
Date through which equity funding is committed							May 2016
Remaining equity commitment outstanding							$ 5.7
Remaining equity commitment outstanding from third parties							12.9
Date through which equity is committed, extended date							May 2019
Trinity guarantees of subsidiary-related activities				0
Contribution from TILC to TRIP Holdings						21.6
Contribution from third-party investors to TRIP Holdings	49.6	50.0				49.6
Carrying value of investment in partially-owned subsidiary			$ 229.7
Ownership percentage in partially-owned subsidiary			39.00%