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)