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Real Estate Investments - Summary of Land Parcels Sold (Parenthetical) (Details) | 3 Months Ended | 12 Months Ended |
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Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2018 USD ($) Parcel | Dec. 31, 2017 USD ($) Parcel | Dec. 31, 2016 USD ($) | Jun. 30, 2018 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Gain/(Loss) on Sale |  |  |  | $ 2,932,000 | $ 31,657,000 | $ 116,983,000 |
Garza Ranch - Office [Member] | Land [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Number of Parcels | Parcel |  |  |  | 3 | 2 |  |
Aggregate deferred gain recognized |  |  |  | $ 200,000 |  |  | $ 2,800,000
Bishops Gate [Member] | Land [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Provision for impairment on assets held for sale | $ 300,000 | $ 3,000,000.0 |  |  |  |  |
Carrying value of real estate prior to impairment | 5,900,000 |  |  |  |  |  |
Aggregate carrying value | $ 5,600,000 |  |  |  |  |  |
Greenhills Land [Member] | Land [Member] |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |
Provision for impairment on assets held for sale |  |  | $ 300,000 |  |  |  |
Gain/(Loss) on Sale |  |  |  |  |  | $ 0 |

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