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Real Estate Investments - Summary of Properties Classified as Held for Sale Included in Continuing Operations (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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ASSETS HELD FOR SALE |  |
Operating properties | $ 16,916 |
Accumulated depreciation | (4,524) |
Operating real estate investments, net | 12,392 |
Construction-in-progress | 212 |
Total real estate investments, net | 12,604 |
Other assets | 0 |
Total assets held for sale, net | 12,604 | $ 584,365
LIABILITIES HELD FOR SALE |  |
Other liabilities | 49 |
Total liabilities held for sale | 49 | $ 2,151
Held for Sale Properties Included in Continuing Operations [Member] | 620, 640 and 660 Allendale Road [Member] |  |
ASSETS HELD FOR SALE |  |
Operating properties | 12,550 |
Accumulated depreciation | (4,520) |
Operating real estate investments, net | 8,030 |
Construction-in-progress | 212 |
Total real estate investments, net | 8,242 |
Other assets | 0 |
Total assets held for sale, net | 8,242 |
LIABILITIES HELD FOR SALE |  |
Other liabilities | 49 |
Total liabilities held for sale | 49 |
Held for Sale Properties Included in Continuing Operations [Member] | Oakland Lot B [Member] |  |
ASSETS HELD FOR SALE |  |
Operating properties | 4,366 |
Accumulated depreciation | (4) |
Operating real estate investments, net | 4,362 |
Construction-in-progress | 0 |
Total real estate investments, net | 4,362 |
Other assets | 0 |
Total assets held for sale, net | 4,362 |
LIABILITIES HELD FOR SALE |  |
Other liabilities | 0 |
Total liabilities held for sale | $ 0 |

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