INTANGIBLE ASSETS AND LIABILITIES, NET - Summarized Intangible Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Intangible assets:
Total intangible assets, net	$ 37,978	$ 40,043
Intangible liabilities:
Acquired unfavorable lease intangibles	2,732	2,732
Less: Accumulated amortization	(1,576)	(1,374)
Acquired unfavorable lease intangibles, net	1,156	1,358
Off-Market Favorable Lease
Intangible assets:
Acquired finite-lived intangibles	37,775	36,747
Accumulated amortization	(22,645)	(20,452)
Total	15,130	16,295
Customer relationships
Intangible assets:
Acquired finite-lived intangibles	35,738	35,738
Accumulated amortization	(12,890)	(11,990)
Total	22,848	23,748
Reportable Subsegments | Operating Segments | Equipment Leasing | Aviation Leasing
Intangible assets:
Total intangible assets, net	15,130	16,295
Intangible liabilities:
Acquired unfavorable lease intangibles	2,732	2,732
Less: Accumulated amortization	(1,576)	(1,374)
Acquired unfavorable lease intangibles, net	1,156	1,358
Reportable Subsegments | Operating Segments | Equipment Leasing | Aviation Leasing | Off-Market Favorable Lease
Intangible assets:
Acquired finite-lived intangibles	37,775	36,747
Accumulated amortization	(22,645)	(20,452)
Total	15,130	16,295
Reportable Subsegments | Operating Segments | Equipment Leasing | Aviation Leasing | Customer relationships
Intangible assets:
Acquired finite-lived intangibles	0	0
Accumulated amortization	0	0
Total	0	0
Reportable Subsegments | Operating Segments | Infrastructure | Jefferson Terminal
Intangible assets:
Total intangible assets, net	22,799	23,688
Intangible liabilities:
Acquired unfavorable lease intangibles	0	0
Less: Accumulated amortization	0	0
Acquired unfavorable lease intangibles, net	0	0
Reportable Subsegments | Operating Segments | Infrastructure | Jefferson Terminal | Off-Market Favorable Lease
Intangible assets:
Acquired finite-lived intangibles	0	0
Accumulated amortization	0	0
Total	0	0
Reportable Subsegments | Operating Segments | Infrastructure | Jefferson Terminal | Customer relationships
Intangible assets:
Acquired finite-lived intangibles	35,513	35,513
Accumulated amortization	(12,714)	(11,825)
Total	22,799	23,688
Reportable Subsegments | Operating Segments | Infrastructure | Railroad
Intangible assets:
Total intangible assets, net	49	60
Intangible liabilities:
Acquired unfavorable lease intangibles	0	0
Less: Accumulated amortization	0	0
Acquired unfavorable lease intangibles, net	0	0
Reportable Subsegments | Operating Segments | Infrastructure | Railroad | Off-Market Favorable Lease
Intangible assets:
Acquired finite-lived intangibles	0	0
Accumulated amortization	0	0
Total	0	0
Reportable Subsegments | Operating Segments | Infrastructure | Railroad | Customer relationships
Intangible assets:
Acquired finite-lived intangibles	225	225
Accumulated amortization	(176)	(165)
Total	$ 49	$ 60