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Real Estate Investments - Summary of Properties Classified as Held for Sale Included in Continuing Operations (Parenthetical) (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Jun. 01, 2016 ft²
1120 Executive Boulevard [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Rentable Square Feet | ft² |  |  | 95,183
Provision for impairment on assets held for sale | $ 1,800,000 |  |
Purchase and Sale Agreement Date |  | Jun. 01, 2016 |
Oakland Lot B [Member] |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |
Provision for impairment on assets held for sale |  | $ 0 |

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