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REAL ESTATE ASSETS (Properties) (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 ft² Property State | Mar. 31, 2020 ft² Property | Oct. 31, 2017 Property
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |
Number of properties |  |  | 1
Number of states that real estate property is located | State | 7 |  |
North Dakota |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |
Number of properties | 4 |  |
Industrial Properties |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |
Number of properties | 1 | 1 |
Single Family |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |
Term of non-cancelable lease agreements | 18 months |  |
Term of option to extend lease agreements | 6 months |  |
Office Properties |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |
Number of properties | 12 | 10 |
Industrial Office Properties |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |
Rentable square feet | ft² | 1,192,566 | 998,016 |
Retail Properties |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |
Number of properties | 4 | 4 |
Rentable square feet | ft² | 131,722 | 131,722 |
Residential Properties |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items] |  |  |
Number of properties | 136 | 138 |
Number of Limited Liability Companies | 1 | 1 |

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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981 + Details
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