SEGMENT INFORMATION - Statement of Income by Segment (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) segment	Dec. 31, 2014 USD ($) segment	Dec. 31, 2013 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment									5
Number of additional reportable segments | segment										2
Revenues
Total revenues	$ 33,798	$ 35,233	$ 33,564	$ 33,973	$ 23,419	$ 16,080	$ 10,735	$ 7,696	$ 136,568	$ 57,930	$ 19,530
Expenses
Operating expenses									68,793	27,223	3,157
General and administrative									7,568	2,007	805
Acquisition and transaction expenses									5,683	11,450	260
Management fees and incentive allocation to affiliate									15,018	5,463	2,211
Depreciation and amortization									45,308	15,998	3,909
Interest expense									19,311	5,872	2,816
Total expenses	44,786	43,475	40,194	33,226	27,482	17,733	15,302	7,496	161,681	68,013	13,158
Other income (expense)
Equity in (loss) earnings of unconsolidated entities									(6,956)	6,093	10,325
Gain (loss) on sale of equipment									3,419	7,576	2,415
Gain on sale of unconsolidated entity									0	0	6,144
Interest income									579	186	23
Other income (expense)									26	20	0
Total other income (expense)	1,681	(7,664)	1,626	1,425	4,780	3,755	3,779	1,561	(2,932)	13,875	18,907
(Loss) Income before income taxes	(9,307)	(15,906)	(5,004)	2,172	717	2,102	(788)	1,761	(28,045)	3,792	25,279
Provision (benefit) for income taxes	(60)	150	266	230	160	156	399	159	586	874	0
Net (loss) income	(9,247)	(16,056)	(5,270)	1,942	557	1,946	(1,187)	1,602	(28,631)	2,918	25,279
Less: Net (loss) income attributable to non-controlling interests in consolidated subsidiaries	(4,548)	(4,318)	(4,433)	(3,506)	(3,118)	(2,085)	165	176	(16,805)	(4,862)	458
Net (loss) income attributable to shareholders	$ (4,699)	$ (11,738)	$ (837)	$ 5,448	$ 3,675	$ 4,031	$ (1,352)	$ 1,426	(11,826)	7,780	24,821
Equipment Leasing
Revenues
Total revenues									92,743	43,984	19,530
Infrastructure
Revenues
Total revenues									43,825	13,946	0
Operating Segments | Reportable Subsegments | Equipment Leasing | Aviation Leasing
Revenues
Total revenues									61,330	20,958	6,645
Expenses
Operating expenses									2,820	1,713	2,191
General and administrative									0	0	0
Acquisition and transaction expenses									0	0	0
Management fees and incentive allocation to affiliate									0	0	0
Depreciation and amortization									23,549	9,445	2,972
Interest expense									0	0	0
Total expenses									26,369	11,158	5,163
Other income (expense)
Equity in (loss) earnings of unconsolidated entities									0	0	0
Gain (loss) on sale of equipment									3,053	7,576	2,415
Gain on sale of unconsolidated entity											0
Interest income									11	26	23
Other income (expense)									0	0
Total other income (expense)									3,064	7,602	2,438
(Loss) Income before income taxes									38,025	17,402	3,920
Provision (benefit) for income taxes									668	490	0
Net (loss) income									37,357	16,912	3,920
Less: Net (loss) income attributable to non-controlling interests in consolidated subsidiaries									21	0	0
Net (loss) income attributable to shareholders									37,336	16,912	3,920
Operating Segments | Reportable Subsegments | Equipment Leasing | Offshore Energy
Revenues
Total revenues									24,231	14,630	5,264
Expenses
Operating expenses									4,650	1,054	450
General and administrative									0	0	0
Acquisition and transaction expenses									0	0	0
Management fees and incentive allocation to affiliate									0	0	0
Depreciation and amortization									5,967	2,801	937
Interest expense									3,794	1,248	104
Total expenses									14,411	5,103	1,491
Other income (expense)
Equity in (loss) earnings of unconsolidated entities									0	0	2,700
Gain (loss) on sale of equipment									0	0	0
Gain on sale of unconsolidated entity											6,144
Interest income									483	160	0
Other income (expense)									0	0
Total other income (expense)									483	160	8,844
(Loss) Income before income taxes									10,303	9,687	12,617
Provision (benefit) for income taxes									0	0	0
Net (loss) income									10,303	9,687	12,617
Less: Net (loss) income attributable to non-controlling interests in consolidated subsidiaries									676	704	458
Net (loss) income attributable to shareholders									9,627	8,983	12,159
Operating Segments | Reportable Subsegments | Equipment Leasing | Shipping Containers
Revenues
Total revenues									7,182	8,396	7,621
Expenses
Operating expenses									350	257	516
General and administrative									0	0	0
Acquisition and transaction expenses									0	0	0
Management fees and incentive allocation to affiliate									0	0	0
Depreciation and amortization									0	0	0
Interest expense									2,393	2,840	2,699
Total expenses									2,743	3,097	3,215
Other income (expense)
Equity in (loss) earnings of unconsolidated entities									(6,956)	6,093	7,625
Gain (loss) on sale of equipment									0	0	0
Gain on sale of unconsolidated entity											0
Interest income									0	0	0
Other income (expense)									(14)	(26)
Total other income (expense)									(6,970)	6,067	7,625
(Loss) Income before income taxes									(2,531)	11,366	12,031
Provision (benefit) for income taxes									(127)	100	0
Net (loss) income									(2,404)	11,266	12,031
Less: Net (loss) income attributable to non-controlling interests in consolidated subsidiaries									0	0	0
Net (loss) income attributable to shareholders									(2,404)	11,266	12,031
Operating Segments | Reportable Subsegments | Infrastructure | Jefferson Terminal
Revenues
Total revenues									18,275	3,977	0
Expenses
Operating expenses									33,154	9,095	0
General and administrative									0	0	0
Acquisition and transaction expenses									0	5,494	0
Management fees and incentive allocation to affiliate									0	0	0
Depreciation and amortization									13,897	2,763	0
Interest expense									12,546	1,552	0
Total expenses									59,597	18,904	0
Other income (expense)
Equity in (loss) earnings of unconsolidated entities									0	0	0
Gain (loss) on sale of equipment									(199)	0	0
Gain on sale of unconsolidated entity											0
Interest income									85	0	0
Other income (expense)									40	46
Total other income (expense)									(74)	46	0
(Loss) Income before income taxes									(41,396)	(14,881)	0
Provision (benefit) for income taxes									41	284	0
Net (loss) income									(41,437)	(15,165)	0
Less: Net (loss) income attributable to non-controlling interests in consolidated subsidiaries									(17,376)	(5,566)	0
Net (loss) income attributable to shareholders									(24,061)	(9,599)	0
Operating Segments | Reportable Subsegments | Infrastructure | Railroad
Revenues
Total revenues									25,550	9,969	0
Expenses
Operating expenses									27,819	15,104	0
General and administrative									0	0	0
Acquisition and transaction expenses									0	5,646	0
Management fees and incentive allocation to affiliate									0	0	0
Depreciation and amortization									1,895	989	0
Interest expense									578	187	0
Total expenses									30,292	21,926	0
Other income (expense)
Equity in (loss) earnings of unconsolidated entities									0	0	0
Gain (loss) on sale of equipment									565	0	0
Gain on sale of unconsolidated entity											0
Interest income									0	0	0
Other income (expense)									0	0
Total other income (expense)									565	0	0
(Loss) Income before income taxes									(4,177)	(11,957)	0
Provision (benefit) for income taxes									0	0	0
Net (loss) income									(4,177)	(11,957)	0
Less: Net (loss) income attributable to non-controlling interests in consolidated subsidiaries									(121)	0	0
Net (loss) income attributable to shareholders									(4,056)	(11,957)	0
Corporate
Revenues
Total revenues									0	0	0
Expenses
Operating expenses									0	0	0
General and administrative									7,568	2,007	805
Acquisition and transaction expenses									5,683	310	260
Management fees and incentive allocation to affiliate									15,018	5,463	2,211
Depreciation and amortization									0	0	0
Interest expense									0	45	13
Total expenses									28,269	7,825	3,289
Other income (expense)
Equity in (loss) earnings of unconsolidated entities									0	0	0
Gain (loss) on sale of equipment									0	0	0
Gain on sale of unconsolidated entity											0
Interest income									0	0	0
Other income (expense)									0	0
Total other income (expense)									0	0	0
(Loss) Income before income taxes									(28,269)	(7,825)	(3,289)
Provision (benefit) for income taxes									4	0	0
Net (loss) income									(28,273)	(7,825)	(3,289)
Less: Net (loss) income attributable to non-controlling interests in consolidated subsidiaries									(5)	0	0
Net (loss) income attributable to shareholders									$ (28,268)	$ (7,825)	$ (3,289)