Partially-Owned Leasing Subsidiaries (Details Textual) - Railcar Leasing and Management Services Group $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($) board_member subsidiary
Partially-owned subsidiaries
Noncontrolling Interest [Line Items]
Number of subsidiaries \| subsidiary	2
Number of board members \| board_member	7
Number of TILC designated board members \| board_member	2
Carrying value of investment in partially-owned subsidiaries	$ 223.3
Weighted average ownership	39.00%
Weighted average ownership interest by institutional investors	61.00%
TRIP Holdings
Noncontrolling Interest [Line Items]
Remaining equity commitment outstanding from TILC	$ 5.7
Remaining equity commitment outstanding from third parties	$ 12.9

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