Partially-Owned Leasing Subsidiaries (Details Textual) (USD $) In Millions, unless otherwise specified	6 Months Ended					1 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Leasing Group Partially-owned subsidiaries subsidiaries board_members	Jun. 30, 2014 Leasing Group TRIP Leasing Railcar	Jun. 30, 2014 Leasing Group RIV 2013	May 31, 2014 Leasing Group TRIP Holdings	Jun. 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	0				49.6
Carrying value of investment in partially-owned subsidiary					$ 45.2		$ 184.8
Ownership percentage in partially-owned subsidiary					31.00%		43.00%